A refined static ice load calculation method, device and equipment considering the upright structure of platform appendage members and a medium

Abstract

The present application relates to a kind of fine static ice load calculation method, device, equipment and medium considering platform accessory member vertical structure, the method includes: obtaining the size parameter of vertical structure and accessory member in the vertical structure of the ocean platform to be measured, and the reference ice load of vertical structure and accessory member in the vertical structure of the ocean platform to be measured under complete ice body condition;The data obtained are input into the pre-constructed universal fine static ice load calculation model, to obtain the fine static ice load of the ocean platform to be measured vertical structure, wherein, universal fine static ice load calculation model introduces geometric sheltering coefficient, vertical structure correction coefficient, accessory member correction coefficient, joint failure coefficient and conservative correction coefficient, the present application can be widely applied in sea ice engineering technical field.

Description

Technical Field

[0001] This invention relates to the field of sea ice engineering technology, and in particular to a refined method, apparatus, equipment and medium for calculating static ice loads considering the upright structure of platform attachment components. Background Technology

[0002] In the design of offshore platforms in ice-covered areas, static ice load is one of the key control loads determining the safety of core structures such as the main legs of upright platforms. Currently, the engineering community commonly uses a simplified method of "maximum projected width of the blockage" to calculate the static ice load of upright structures with auxiliary components (such as risers, pump ducts, cable ducts, and berthing components), that is, using the maximum projected width of the upright structure and auxiliary components as the calculation benchmark. However, this method has inherent flaws: it does not consider the joint icebreaking effect between the upright structure and auxiliary components (such as shielding effect, asynchronous ice breakage, damage superposition, etc.), nor does it incorporate the influence of auxiliary component layout parameters (spacing, angle, size ratio, etc.) on the ice load. This results in overly conservative calculation results, which not only significantly increases the cost of structural materials and engineering investment, but also causes redundant waste of design resources.

[0003] Currently, the industry urgently needs to achieve refined and accurate assessment of ice loads under complex auxiliary component conditions, but a mature and universal refined calculation method has not yet been formed. The core technical bottlenecks are twofold: first, the parameters are complex, with significant variability in the number, size, spacing, and arrangement angle of auxiliary components, and diverse structural combinations, making it difficult to adapt a single calculation model to all conditions; second, the limitations of experimental methods. While ice load model tests can accurately predict ice loads under specific conditions, the near-infinite combination of auxiliary components makes it impossible to exhaustively test a large number of samples, thus hindering the development of a universal calculation method purely through experimentation. Due to these constraints, existing research has not yet formed a universal refined calculation model covering both single and multiple auxiliary component conditions. Ice loads obtained using traditional standard methods are often much larger than experimental results, and within a specific ice attack angle range, the load amplitude and evolution law deviate significantly from reality, failing to provide a reliable basis for engineering design.

[0004] In summary, the core technical challenge that urgently needs to be overcome in the field of marine engineering in ice-covered areas is to establish a static ice load calculation method that can cover all types of upright structures with attached components, based on a scientific mathematical model of ice load, by optimizing the experimental scheme and strictly controlling the experimental scale, with a limited number of experimental groups. Summary of the Invention

[0005] To address the aforementioned problems, the purpose of this invention is to provide a refined method, apparatus, equipment, and medium for calculating static ice loads considering the upright structure of platform auxiliary components. This method can solve the technical problems in the prior art where static ice load calculations for upright structures with auxiliary components are overly conservative, lack reasonable evaluation methods, have limited applicability, and insufficient calculation accuracy.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: Firstly, it provides a refined method for calculating static ice loads considering the upright structure of platform auxiliary components, comprising: Obtain the dimensional parameters of the vertical structure and auxiliary components in the vertical structure of the offshore platform under test, as well as the reference ice load of the vertical structure and auxiliary components in the vertical structure of the offshore platform under test under intact ice conditions; The acquired data is input into a pre-built universal refined static ice load calculation model to obtain the refined static ice load of the vertical structure of the marine platform under test. The universal refined static ice load calculation model introduces geometric shielding coefficient, vertical structure correction coefficient, auxiliary component correction coefficient, joint failure coefficient and conservative correction coefficient.

[0007] Furthermore, the construction process of the universal and refined static ice load calculation model is as follows: Determine the dimensional parameters of the upright structure and its attached components, as well as the basic parameters of sea ice in the target sea area; Based on the dimensional parameters of the upright structure and its auxiliary components, geometric shading coefficient, upright structure correction coefficient, auxiliary component correction coefficient and joint failure coefficient are introduced to establish ice load calculation models for single auxiliary components and multiple auxiliary components, as well as calculation models for the ultimate ice load of the upright structure considering the influence of auxiliary components. Calibration tests were conducted on each undetermined coefficient in each ice load calculation model, and ice load data under different working conditions were obtained through ice-water pool tests. Based on the basic sea ice parameters of the target sea area, the values ​​of each undetermined coefficient were obtained. Among them, the undetermined coefficients include geometric shielding coefficient, upright structure correction coefficient, auxiliary component correction coefficient, and joint failure coefficient. Based on the obtained values ​​of each undetermined coefficient, the calculation models for each ice load are optimized to obtain a universal and refined static ice load calculation model.

[0008] Furthermore, the dimensional parameters include the diameter of the upright structure, the diameter of the auxiliary components, and the distance between the center of the main and auxiliary structures.

[0009] Furthermore, the calculation model for the ultimate ice load of the upright structure considering the influence of auxiliary components is as follows: ; In the formula, Ultimate ice load of upright structures considering the influence of auxiliary components; For upright structures, the correction factor is used. Ice load on an upright structure under equivalent diameter conditions; The reference ice load for an upright structure under intact ice conditions; The diameter of the upright structure; Diameter of the auxiliary component; The geometric occlusion factor; The ice load calculation model for the single attached component is as follows: ; In the formula, Ice load for a single attached component, The reference ice load for a single attached component under intact ice conditions. Correction factor for auxiliary components; The ice load calculation model for the multiple auxiliary components is as follows: ; In the formula, The total ice load for multiple auxiliary components, The joint damage coefficient; The designation of the auxiliary components; The number of auxiliary components; For the first The auxiliary component correction factor; For the first The reference ice load of each auxiliary component under complete ice conditions.

[0010] Furthermore, calibration tests are conducted on each undetermined coefficient in each ice load calculation model, and ice load data under different working conditions are obtained through ice-water tank tests. Based on the determined basic parameters of sea ice in the target sea area, the values ​​of each undetermined coefficient are obtained, including: The calibration tests are divided into two categories: single-attached-component configuration and multi-attached-component configuration. Based on the single-attached component configuration and the multi-attached component configuration, calibration tests were carried out on each undetermined coefficient in each ice load calculation model. Based on the total ice load and the ice load of the upright structure under different attached component configuration conditions, the values ​​of geometric shading coefficient, upright structure correction coefficient, attached component correction coefficient and joint failure coefficient were obtained.

[0011] Furthermore, based on the obtained values ​​of each undetermined coefficient, the ice load calculation model is optimized to obtain a universal and refined static ice load calculation model, including: Two complex and typical vertical structures with multiple auxiliary components from actual engineering projects were selected, and verification models were designed. Using the designed verification model, and based on the same scaling ratio and the values ​​of each undetermined coefficient, three series of ice-water pool verification tests were carried out on each ice load calculation model. The theoretical calculation value of static ice load of the verification model is compared with the experimental measured value of the constructed ice load calculation model. If the deviation rate does not meet the requirements, a conservative correction coefficient is introduced. Based on conservative correction coefficients, the calculation models for each ice load are optimized to obtain a universal and refined static ice load calculation model.

[0012] Furthermore, the universal and refined static ice load calculation model is as follows: ; In the formula, For the precise static ice load of the vertical structure of the offshore platform; Ultimate ice load of upright structures considering the influence of auxiliary components; The total ice load for multiple auxiliary components; This is a conservative correction factor; The reference ice load for an upright structure; For upright structures, the correction factor is used. The diameter of the upright structure; The geometric occlusion factor; Diameter of the auxiliary component; The joint damage coefficient; The designation of the auxiliary components; The number of auxiliary components; For the first The auxiliary component correction factor; For the first The reference ice load of each auxiliary component under complete ice conditions.

[0013] Secondly, a refined static ice load calculation device considering the upright structure of platform-attached components is provided, comprising: The data acquisition module is used to acquire the dimensional parameters of the vertical structure and auxiliary components in the vertical structure of the marine platform under test, as well as the reference ice load of the vertical structure and auxiliary components in the vertical structure of the marine platform under test under the condition of intact ice. The refined static ice load calculation module is used to input the acquired data into a pre-built universal refined static ice load calculation model to obtain the refined static ice load of the vertical structure of the marine platform under test. The universal refined static ice load calculation model introduces geometric shielding coefficient, vertical structure correction coefficient, auxiliary component correction coefficient, joint failure coefficient and conservative correction coefficient.

[0014] Thirdly, a processing device is provided, including a computer program, wherein when the computer program is executed by the processing device, it is used to implement the steps corresponding to the above-mentioned method for calculating the refined static ice load considering the upright structure of the platform's attached components.

[0015] Fourthly, a computer-readable storage medium is provided, on which a computer program is stored, wherein the computer program, when executed by a processor, is used to implement the steps corresponding to the above-mentioned method for calculating the refined static ice load considering the upright structure of the platform's attached components.

[0016] The present invention has the following advantages due to the adoption of the above technical solutions: 1. This invention calibrates the reduction coefficient through experiments, combines ice mechanics theory, and considers the combined effects of the main and auxiliary structures (shading, non-simultaneous failure, and damage superposition). It abandons the simplified calculation method of "maximum projected width", and the calculation results are more in line with engineering practice. It can effectively improve the accuracy of ice load calculation, reduce the conservatism of vertical structure design, save material costs, avoid waste of design resources, and solve the problem of overly conservative existing calculation methods.

[0017] 2. Through systematic model tests and combined with ice mechanics theory, this invention has explored the influence of auxiliary component arrangement parameters (spacing, angle, and size ratio) on ice load. It has constructed a universal and refined static ice load calculation model covering single and multiple auxiliary components, which is applicable to ice load assessment of different auxiliary component arrangement forms, and solves the problem of limited applicability of existing methods.

[0018] 3. This invention adopts a combination of "experimentation + ice mechanics theory". Through multiple series of experiments to calibrate parameters, combined with theoretical analysis to correct the ice load calculation model, the calculation accuracy and conservatism are ensured. This provides reliable static ice load data support for the design of vertical structures of offshore platforms in ice-covered areas, ensuring the safety of vertical structures and improving calculation accuracy.

[0019] 4. This invention uses the typical vertical platform structure and sea ice conditions in the Bohai Sea as its research background. The experimental conditions and parameter settings closely match actual engineering projects. The constructed universal and refined static ice load calculation model can be directly applied to the static ice load calculation of vertical offshore platform structures in the Bohai Sea and similar ice-covered areas. It has strong engineering practicality and promotional value, and meets actual engineering needs. Furthermore, this invention can effectively compensate for the calculation deviations caused by the neglect of structural asymmetry in traditional specifications, further improving the scientific nature of engineering design.

[0020] In summary, this invention can be widely applied in the field of sea ice engineering technology. Attached Figure Description

[0021] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Throughout the drawings, the same reference numerals denote the same parts. In the drawings: Figure 1 This is a schematic diagram of the overall technical route provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of a single accessory structure calibration test provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of a multi-attached structure calibration test provided in an embodiment of the present invention; Figure 4 These are parameters provided in an embodiment of the present invention. Follow and A schematic diagram illustrating the evolutionary pattern; Figure 5 These are parameters provided in an embodiment of the present invention. Follow and A schematic diagram illustrating the evolutionary pattern; Figure 6 This is a schematic diagram comparing the calculation results of a vertical offshore platform structure with attached components using the method of this invention (the refined formula in the figure) and the traditional maximum projection distance calculation method (the engineering algorithm in the figure), according to an embodiment of this invention. Figure 6 (a) is a schematic diagram of the upright structure of an offshore platform with auxiliary components. Figure 6 (b) is a schematic diagram comparing the calculation results of the two methods. Detailed Implementation

[0022] Exemplary embodiments of the invention will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the invention and to fully convey the scope of the invention to those skilled in the art.

[0023] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “described” as used herein may also include the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not construed as requiring them to be performed in a particular order described or illustrated unless the order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.

[0024] Although terms such as first, second, third, etc., may be used in this document to describe multiple elements, components, regions, layers, and / or segments, these elements, components, regions, layers, and / or segments should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or segment from another. Unless the context clearly indicates otherwise, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence. Therefore, the first element, component, region, layer, or segment discussed below may be referred to as the second element, component, region, layer, or segment without departing from the teachings of the exemplary embodiments.

[0025] For ease of description, spatial relative terms may be used in the text to describe the relationship of one element or feature relative to another element or feature as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "above," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure.

[0026] Currently, establishing a static ice load calculation method that covers all types of upright structures with auxiliary components, based on a scientific mathematical model of ice loads and through optimized experimental schemes and strict control of experimental scale, with a limited number of experimental groups, is a core technical challenge that urgently needs to be overcome in the field of marine engineering in ice-covered areas. This invention provides a refined static ice load calculation method considering the upright structure of a platform's auxiliary components. The method includes: obtaining the dimensional parameters of the upright structure and auxiliary components in the upright structure of the marine platform under test, as well as the baseline ice loads of the upright structure and auxiliary components under intact ice conditions; inputting the obtained data into a pre-constructed universal refined static ice load calculation model to obtain the refined static ice load of the upright structure of the marine platform under test. The universal refined static ice load calculation model incorporates a geometric shading coefficient, an upright structure correction coefficient, an auxiliary component correction coefficient, a joint failure coefficient, and a conservative correction coefficient. This invention solves the technical problems of existing technologies where the static ice load calculation for upright structures with auxiliary components is overly conservative, lacks reasonable evaluation methods, has limited applicability, and insufficient calculation accuracy. This invention combines theoretical analysis with experimental testing, introducing the combined ice-breaking effect and auxiliary component arrangement parameters into the ice load calculation model. Through multi-parameter coupled mathematical modeling and optimized finite experimental verification strategies, it constructs an ice load calculation method that is both universal and accurate, breaking through the technical bottleneck of traditional simplified methods being too conservative and suffering from severe local distortions. This provides reliable support for the safe and economical design of upright structures with auxiliary components.

[0027] Correspondingly, other embodiments of the present invention provide an apparatus, device, and medium.

[0028] Example 1 This embodiment provides a refined method for calculating static ice loads considering the upright structure of platform attachment components, including the following steps: 1) Determine the dimensional parameters of the upright structure (i.e., the main structure) and auxiliary components, as well as the basic parameters of sea ice in the target sea area, specifically: 1.1) A typical upright structure of an offshore platform with auxiliary components is selected as the research object. Among them, the auxiliary components include common types such as risers, pump protection pipes and cable protection pipes.

[0029] 1.2) Determine the dimensional parameters of the upright structure and its auxiliary components, including the diameter of the upright structure. Diameter of auxiliary components The distance between the center and the center of the main and auxiliary structures .

[0030] 1.3) Determine the basic parameters of sea ice in the target sea area, including ice thickness, ice velocity range, and ice angle of attack range.

[0031] 2) Based on the dimensional parameters of the upright structure and its auxiliary components, geometric shading coefficients, upright structure correction coefficients, auxiliary component correction coefficients, and combined failure coefficients are introduced to establish ice load calculation models for single and multiple auxiliary components, as well as an ultimate ice load calculation model for the upright structure considering the influence of auxiliary components. Specifically: 2.1) Based on the dimensional parameters of the upright structure and its auxiliary components, and introducing geometric shading coefficients, upright structure correction coefficients, and auxiliary component correction coefficients, an ice load calculation model for a single auxiliary component is established, yielding a preliminary expression for the total ice load of a master-slave structure with a single auxiliary component: 2.1.1) Determine the equivalent diameter of the upright structure based on the dimensional parameters of the upright structure and its auxiliary components, as well as the geometric shading coefficient.

[0032] Specifically, in this master-slave structure, the auxiliary components are typically positioned in front of the upright structure in the direction facing the ice, or within its projected area. When the ice floe first impacts the auxiliary components, it creates an ice-breaking channel and a corresponding damage field in a localized area, weakening the integrity and continuity of the ice in front of the upright structure. Therefore, during subsequent impacts, the upright structure no longer contacts an undisturbed, intact ice mass, but rather a pre-damaged ice region, fundamentally altering the boundary conditions of the impact.

[0033] Considering the diameter of the auxiliary component is The diameter of the upright structure is When the auxiliary components are located in front of the upright structure in the direction facing the ice and preferentially participate in ice-breaking, their reduction in the ice-facing range of the upright structure can be described by deducting a portion of the width, thus obtaining the equivalent diameter of the upright structure. expression: (1) In the formula, The geometric shading coefficient is used to characterize the degree to which auxiliary components weaken the ice-facing conditions of upright structures in terms of geometric features.

[0034] 2.1.2) Based on the determined equivalent diameter, establish the correspondence between geometric scale changes and ice load, establish the ice load calculation model for a single attached component and the ultimate ice load calculation model for a vertical structure considering the influence of attached components, and determine the preliminary expression for the total ice load of a master-slave structure with a single attached component.

[0035] Specifically, based on the fundamental form of the ultimate ice load model, the ice load and the structural characteristic dimensions typically satisfy a power function relationship. Therefore, the ice load of a vertical structure under the equivalent diameter condition is... It can be represented as: (2) In the formula, This represents the baseline ice load for an upright structure under conditions of intact ice.

[0036] The above equivalent treatment only considers the geometric weakening of the ice impact range by the auxiliary components. However, in the actual ice-breaking process, the auxiliary components will also change the compression failure mode and boundary conditions of the ice. For example, the premature ice-breaking effect of the auxiliary components may change the ice in front of the upright structure from overall compression failure to a failure mode combining local fragmentation and ice extrusion, thus further affecting the peak ice load. Therefore, the equivalent diameter alone is insufficient to fully describe the influence of the auxiliary components, and a correction factor for the upright structure needs to be introduced on this basis. It is used to uniformly characterize the overall modulation effect of auxiliary components on the ice-breaking process of upright structures.

[0037] In summary, the calculation model for the ultimate ice load of a vertical structure considering the influence of auxiliary components is as follows: (3) in, Ultimate ice load of upright structures considering the influence of auxiliary components.

[0038] Specifically, in a master-slave structure, the icebreaking process of auxiliary components depends not only on their own geometry but also on the significant influence of the upright structure. During icebreaking, the upright structure creates a stress disturbance zone and damage field around itself, the influence of which can typically be several times the structural characteristic scale. In actual marine engineering structures, the distance between auxiliary components and the upright structure is usually within approximately three times the diameter of the upright structure; therefore, the auxiliary components are typically located within the ice area affected by the upright structure. Under these conditions, regardless of whether the auxiliary component is located in front of or behind the upright structure, the ice in front of it may already be affected by the icebreaking action or stress field of the upright structure, thus exhibiting varying degrees of strength weakening or pre-damage characteristics. When the auxiliary component is located behind the upright structure, the ice in front of it is directly within the icebreaking channel or damage field; while when it is located in front of the upright structure, it is also controlled by the "reverse shielding" effect. Therefore, overall, the influence of the upright structure on auxiliary components is universal.

[0039] Based on the above understanding, a correction factor for auxiliary components is introduced. This is used to characterize the influence of an upright structure on the icing conditions of its attached components. Under the condition of a single attached component, the ice load on that single component is... It can be represented as: (4) In the formula, Ice load for a single attached component, The reference ice load for a single attached component under intact ice conditions. It reflects the degree to which the auxiliary components are weakened by the influence of the upright structure.

[0040] 2.2) Introducing a joint failure factor, based on the ice load calculation model of a single attached component, an ice load calculation model of multiple attached components is established, and a preliminary expression for the total ice load of the master-slave structure with multiple attached components is obtained.

[0041] Specifically, based on the ice load calculation model for a single auxiliary component mentioned above, when there are multiple auxiliary components in a vertical structure, the ice impact processes of each auxiliary component are usually asynchronous in time, making it difficult for their peak ice loads to occur simultaneously, and the auxiliary components may also have a shielding effect on each other. Therefore, a joint failure factor can be introduced based on the summation of the ice loads of each auxiliary component. This is used to describe the combined failure effect among multiple auxiliary components; that is, the ice load on multiple auxiliary components can be expressed as: (5) In the formula, The total ice load for multiple auxiliary components; The designation of the auxiliary components; The number of auxiliary components; For the first The auxiliary component correction factor; For the first The reference ice load of each auxiliary component under complete ice conditions.

[0042] In summary, the ice load on a master-slave structure under icing impact can be composed of two parts: the upright structure and the auxiliary components. Specifically, the ice force on the upright structure is quantified through the equivalent diameter. and upright structure correction factor The influence of auxiliary components on the ice impact range and ice-breaking process is characterized; the ice force of auxiliary components is determined by the auxiliary component correction coefficient. The general modulating effect of upright structures on ice impact conditions is described, and a combined failure factor is introduced under conditions with multiple auxiliary components. To take into account the overall impact of joint failure among multiple auxiliary components.

[0043] 3) Calibration tests were conducted on the undetermined coefficients in each ice load calculation model, and ice load data under different working conditions were obtained through ice-water tank tests. Based on the basic sea ice parameters of the determined target sea area, the values ​​of each undetermined coefficient (geometric shielding coefficient, upright structure correction coefficient, auxiliary component correction coefficient, and combined failure coefficient) were obtained, specifically: 3.1) The calibration test is divided into two categories: single-attached-component configuration and multi-attached-component configuration.

[0044] Specifically, based on the ice load calculation model established in step 2) above, the geometric shading coefficient is involved in the total ice load expression of the master-slave structure. Correction coefficient for upright structures Correction coefficient for auxiliary components and joint damage coefficient The aforementioned parameters are all closely related to the structural geometry, therefore the experimental design must be tailored to the parameter fitting requirements. Based on the survey results of the arrangement of auxiliary components in the project, there are significant differences in the types, sizes, and spatial combinations of auxiliary structures between different platforms, making it difficult to use a single geometric configuration for a unified description. Therefore, representative simplified configurations are selected, and the experiments are divided into two categories: single-auxiliary-component configuration and multi-auxiliary-component configuration. These two configurations are used for parameter fitting, verification of relationships at different scales, and influence analysis under multi-component conditions, respectively.

[0045] 3.2) Based on the division of single-attached component configurations and multi-attached component configurations, calibration tests were conducted for each undetermined coefficient in each ice load calculation model, and the total ice load under different attached component configuration conditions was calculated. Ice load on upright structures The values ​​of geometric shading coefficient, upright structure correction coefficient, auxiliary component correction coefficient, and combined failure coefficient are obtained.

[0046] Specifically, during the experiment, the overall ice load time history of the configuration was recorded as follows: The ice load time history of the upright structure is denoted as For each ice velocity condition, its peak value is extracted from the time history curve, and the maximum value is selected from multiple ice velocity sweep results, which is then recorded as the total ice load under the configuration condition of that auxiliary component. Ice load on upright structures The specific process of this step is as follows: 3.2.1) Determine the reference ice load for the upright structure Reference ice load for auxiliary components The two benchmark values ​​mentioned above serve as reference values ​​for subsequent correction of ice loads on upright structures and auxiliary components.

[0047] 3.2.2) Based on the basic sea ice parameters of the determined target sea area and the reference ice load of the upright structure Reference ice load for auxiliary components Determine the equivalent diameter of the upright structure. and geometric occlusion factor .

[0048] Specifically, under configurations including auxiliary components, the ice load on upright structures is reduced compared to the baseline value, and the amount of reduction is... for: (6) The reduction This reflects the degree of influence of auxiliary components on the icing process of the upright structure. Based on the equivalent diameter model, this influence is attributed to a reduction in the effective icing range of the upright structure, and this is further analyzed using a geometric shielding coefficient. Characterization, geometric occlusion coefficient This is a dimensionless parameter representing the "reduction ratio" of the auxiliary components to the leading edge of the upright structure; its value may vary with the angle of attack. Changes, through fitting and The relationship is determined. The geometric occlusion coefficient is obtained. Angle of attack with ice function of change Then, the equivalent diameter of the upright structure under each working condition can be calculated. .

[0049] 3.2.3) Equivalent diameter based on upright structure Calculate the ice load on an upright structure under the condition of equivalent diameter. Correction factor for upright structures .

[0050] Specifically, after obtaining the equivalent diameter of the upright structure Next, it needs to be converted from a geometric scale to a mechanical quantity. Based on the ice load scale relationship, the ice load on the upright structure corresponding to the equivalent diameter can be obtained. This value represents the ultimate ice load that a vertical structure should withstand under equivalent diameter conditions. A correction factor for the vertical structure is further defined. for: (7) This coefficient reflects the influencing factors that still need further correction after considering the equivalent diameter. Its value should be related to parameters such as configuration spatial distribution and ice attack angle.

[0051] 3.2.4) Reference ice load based on auxiliary components Calculate the correction factor for auxiliary components. Ice load on single attached components .

[0052] Specifically, for a single-attached-component configuration, an attachment correction factor is defined. for: (8) In the formula, The extreme values ​​of ice load on the auxiliary components were measured in the experiment.

[0053] This coefficient reflects the degree of change in ice load on auxiliary components relative to the independent state when an upright structure is present. By processing test data of single auxiliary component configurations, correction coefficients for auxiliary components under different working conditions can be obtained. Values.

[0054] 3.2.5) Based on the correction coefficient of auxiliary components Calculate the combined damage factor .

[0055] Specifically, for configurations with multiple auxiliary components, the experimental data processing is further elaborated based on the above. Assume there are multiple auxiliary components, whose ice loads are denoted as follows: Correction coefficients for auxiliary components obtained from single auxiliary component configuration tests. The relationship can be used to calculate the predicted ice load on each auxiliary component under the current working conditions. : (9) The predicted ice load of each auxiliary component Summing these values ​​yields the theoretical superposition result. for: (10) On the other hand, the total ice load on the auxiliary components measured by the experiment is: (11) In the formula, For the first Total ice load of each auxiliary component.

[0056] Based on this definition, the joint failure coefficient is obtained. for: (12) This coefficient is used to characterize the overall load deviation caused by the combined failure effect among multiple auxiliary components. In this invention, this parameter is used as a preliminary exploration for the extended analysis of the model, and its specific laws are not the main fitting object.

[0057] Through the above steps, it can be obtained directly from the experiment. , And further calculations yielded , , and ,in, , , Both vary with configuration parameters and ice attack angle.

[0058] 4) Based on the obtained values ​​of each undetermined coefficient, the calculation models for each ice load are optimized to obtain a universal and refined static ice load calculation model, specifically: 4.1) Select two complex and typical vertical structures with multiple auxiliary components (3 auxiliary components and 4 auxiliary components) from actual engineering projects and design verification models.

[0059] 4.2) Using the designed verification model, based on the same scaling ratio and the values ​​of each undetermined coefficient, three series of ice-water pool verification tests were carried out on each ice load calculation model to verify the rationality and conservatism of the constructed ice load calculation model.

[0060] Specifically, based on the ice load calculation model constructed in step 2) above, and combined with the undetermined coefficients calibrated in step 3) above, the main and auxiliary structural dimension parameters (diameter of the upright structure) of the designed verification model are substituted into the model. Diameter of auxiliary components Main and auxiliary spacing (etc.) and basic sea ice parameters (ice thickness, angle of attack) (etc.), to calculate the theoretical value of static ice load for the verification model.

[0061] Specifically, the three series of ice-water pool verification tests include the first type of basic configuration test, the second type of verification configuration test, and the third type of extended configuration test. The first type of basic configuration test involves single-phase shading of the slave to the master based on different combinations of ice attack angles and spacing, followed by fitting the slave-to-master influence coefficient, and then performing the reverse action of the master to the slave, followed by fitting the master-to-slave influence coefficient. The second type of verification configuration test involves selecting different structural combinations of different sizes to calculate the fitting parameters, and then comparing and verifying and correcting the parameters. The third type of extended configuration test involves introducing multiple auxiliary components to explore the joint failure effect of multiple components, and performing extended calculations from one to many. The three series of ice-water pool verification tests are publicly available tests in the prior art, and the specific process will not be elaborated here.

[0062] 4.3) Compare the theoretical calculation values ​​of static ice load from the verification model with the experimentally measured values ​​from the constructed ice load calculation model. If the deviation rate is greater than 10%, a conservative correction factor is introduced. To ensure that the calculation results for multiple auxiliary components are more consistent with the actual engineering situation; if the deviation rate is no greater than 10%, a conservative correction factor will not be added. .

[0063] 4.4) Based on conservative correction coefficient The calculation models for each ice load were optimized to obtain a universal and refined static ice load calculation model.

[0064] Specifically, the calibration test data and verification test data from step 3) above are integrated with ice mechanics theory, based on conservative correction coefficients. The ice load calculation models for single and multiple attached components are optimized to form a universal and refined static ice load calculation model applicable to different arrangements of attached components. This model can cover the static ice load calculation of vertical structures with single or multiple attached components (two or more) commonly seen in actual engineering projects. The universal and refined static ice load calculation model is as follows: (13) In the formula, For the precise static ice load of the vertical structure of the offshore platform; Conservative correction factor ( hour ; hour ).

[0065] 5) Obtain the dimensional parameters of the vertical structure and auxiliary components in the vertical structure of the marine platform under test, as well as the reference ice load of the vertical structure and auxiliary components in the vertical structure of the marine platform under test under the condition of intact ice, and input them into the constructed universal refined static ice load calculation model to obtain the refined static ice load of the vertical structure of the marine platform under test.

[0066] The following detailed embodiments illustrate the refined static ice load calculation method of the present invention, which considers the upright structure of platform auxiliary components: Single-attached structure calibration test: Regarding the selection of basic sea ice parameters, to reflect the stress characteristics under extreme working conditions, the ice thickness and ice strength were both selected based on 100-year return period design values. According to the environmental parameters of the fourth ice zone in the Bohai Sea given in "Q / HSn 3000-2002 Regulations on Sea Ice Conditions and Applications in China", and scaled down to a 1:10 geometric scale, the model ice thickness was determined to be 50 mm, the compressive strength to be 224 kPa, and the flexural strength to be 74.2 kPa.

[0067] Regarding structural dimensions, based on statistical results of common auxiliary component dimensions in engineering projects, the diameter of the upright structure was selected. =2.6 (prototype scale). For different research purposes, the dimensions of the auxiliary components are set in two categories: the first uses the most common auxiliary component diameter. =0.762; the second method uses a smaller diameter =0.38, used to verify the applicability of the parameter relationship under different scale conditions. The above dimensions, after being scaled down to 1:10, correspond to model dimensions of 76.2mm and 38mm, respectively.

[0068] Among these, the single-attached-component test is the core content of this study. Its basic configuration is a combination of a single upright structure and a single attached component. The basic form of this configuration is as follows: Figure 1 As shown in the figure. Under this configuration, the interaction between the upright structure and the auxiliary components is relatively clear, which can be used to analyze the influence of the auxiliary components on the ice impact range of the upright structure and the influence of the upright structure on the ice impact conditions of the auxiliary components.

[0069] By changing the relative position between the auxiliary components and the upright structure, the degree to which the auxiliary components shield the ice-facing side of the upright structure can be controlled, thereby achieving the equivalent diameter of the upright structure. The changes in geometric shading coefficient are analyzed based on this. The value selection rules are as follows. Simultaneously, by separately measuring the total ice load of the configuration and the ice load of the upright structure, the ice load of the auxiliary components can be obtained from the difference, thereby establishing a correction coefficient for the auxiliary components. The relationship between the changes and the ice load variation of the upright structure are analyzed, and the correction coefficient of the upright structure is also analyzed. The value characteristics.

[0070] Regarding the design of the relative positions of components, the center-to-center spacing As a crucial parameter influencing the shielding range and stress disturbance area, its value must meet the basic requirements of parameter fitting. Based on engineering survey results, the maximum distance between auxiliary components and the upright structure can reach approximately 5m (prototype scale). Therefore, three typical distances are selected within this range: the minimum distance (component contact) to characterize strong interaction conditions; the maximum distance (approximately 5m) to characterize weak interaction limit states; and an intermediate distance between the two. The selection of the intermediate distance takes into account the principle of geometric projection consistency, that is, under specific ice attack angle conditions, ensuring that the projection relationship of different distance configurations in the direction of ice inrush is comparable, thereby providing a unified reference for analyzing the impact of spatial arrangement on ice load. The selection principle is as follows: Figure 2 As shown.

[0071] Regarding the ice attack angle setting, in order to systematically examine the influence of different ice-coming directions on the structure's ice-collision process, for the single auxiliary component configuration test, the working conditions were arranged in 30° increments within the range of 0° to 180°; for the second type of verification configuration test, typical angles were selected for comparative analysis within the range of 0° to 90°, so as to take into account both the test scale and parameter coverage requirements.

[0072] Based on the above parameter system, the single auxiliary component configuration test constructs a complete parameter space by combining three sets of spacings and multiple ice attack angles, which is used to fit the geometric shielding coefficient. and upright structure correction factor Correction coefficient for auxiliary components The relationship between the ice load and the ice load on the vertical structure is obtained in this type of test. By acquiring the total ice load on the configuration and the ice load on the vertical structure, the ice load on the auxiliary components can be further obtained, providing basic data for parameter decomposition. While maintaining consistent configuration and spacing, the parameter relationships obtained from the first type of test are compared and analyzed by changing the diameter of the auxiliary components. This type of test is primarily used to verify... , , The applicability of the form of expression under different scale conditions.

[0073] Multi-attached structure calibration test: The multi-attached-component test, based on the single-attached-component test, introduces the case of multiple attached components. In this type of test, in addition to maintaining the spacing design under the single-component condition, the lateral spacing between the attached components is further set as a control variable to measure the combined failure coefficient. A preliminary exploration of its function is conducted, and its schematic diagram is shown below. Figure 3 As shown. By changing the relative positions of the auxiliary components, their failure sequence during the ice impact process is altered, thus affecting the superposition of the overall ice load. This type of working condition is mainly used to analyze the interaction characteristics under conditions with multiple auxiliary components and to determine the combined failure factor. The introduction provides a basis. For example... Figure 4 The parameters are shown below. Follow and A schematic diagram illustrating the evolutionary pattern. Figure 5 For parameters Follow and A schematic diagram illustrating the evolutionary pattern.

[0074] Based on this, under each fixed configuration condition (i.e., structural dimensions, spacing, and ice attack angle are determined), no fewer than five groups of sweep tests were conducted at different ice velocities. By comparing the ice load time history response under different ice velocity conditions, the maximum total ice load of the corresponding configuration was selected as the representative value, thereby reducing the influence of a single velocity condition on the results.

[0075] Computational model validation, refinement, and universality building: Through experimental research on the above two basic configurations, a description of the spacing between the main and auxiliary structures and the configuration of two auxiliary structures that are common in current platforms is formed. Combined with verification test data and ice mechanics theory, the formula parameters are corrected, and finally a universal and refined static ice load calculation model is constructed to realize the refined calculation of static ice load of single auxiliary components and multiple auxiliary components (two or more) of vertical structures.

[0076] against Figure 6 (a) shows an upright structure with attached components. The results of calculating its ice attack angles of 0°, 30°, 60°, and 90° were obtained using both the method of this invention and the conventional maximum projection distance calculation method. Figure 6 As shown in (b), it can be seen that the total ice load obtained by the method of the present invention, compared with the traditional maximum projection distance calculation method, has a different degree of reduction effect under the four ice attack angles. The ice load is reduced by more than 30%, which can significantly reduce the size of the platform design load and help the platform reduce costs and increase efficiency.

[0077] Example 2 This embodiment provides a refined static ice load calculation device that considers the upright structure of platform auxiliary components, including: The data acquisition module is used to acquire the dimensional parameters of the vertical structure and auxiliary components in the vertical structure of the marine platform under test, as well as the reference ice load of the vertical structure and auxiliary components in the vertical structure of the marine platform under test under the condition of intact ice. The refined static ice load calculation module is used to input the acquired data into a pre-built universal refined static ice load calculation model to obtain the refined static ice load of the vertical structure of the marine platform under test. The universal refined static ice load calculation model introduces geometric shielding coefficient, vertical structure correction coefficient, auxiliary component correction coefficient, joint failure coefficient and conservative correction coefficient.

[0078] The system provided in this embodiment is used to execute the above-described method embodiments. For specific processes and details, please refer to the above embodiments, which will not be repeated here.

[0079] Example 3 This embodiment provides a processing device corresponding to the refined static ice load calculation method considering the upright structure of platform auxiliary components provided in Embodiment 1. The processing device can be applied to client processing devices, such as mobile phones, laptops, tablets, desktop computers, etc., to execute the method of Embodiment 1.

[0080] The processing device includes a processor, a memory, a communication interface, and a bus. The processor, memory, and communication interface are connected via the bus to enable communication between them. The memory stores a computer program that can run on the processing device. When the processing device runs the computer program, it executes the refined static ice load calculation method considering the upright structure of the platform's attached components provided in Embodiment 1.

[0081] In some implementations, the memory may be high-speed random access memory (RAM), and may also include non-volatile memory, such as at least one disk storage device.

[0082] In other implementations, the processor can be any type of general-purpose processor, such as a central processing unit (CPU) or a digital signal processor (DSP), and there is no limitation here.

[0083] Furthermore, the logical instructions in the aforementioned memory can be implemented as software functional units and sold or used as independent products, and can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0084] Those skilled in the art will understand that the structure of the above-described computing device is only a partial structure related to the present invention and does not constitute a limitation on the computing device to which the present invention is applied. A specific computing device may include more or fewer components, or combine certain components, or have different component arrangements.

[0085] Example 4 This embodiment provides a computer program product corresponding to the refined static ice load calculation method considering the upright structure of platform auxiliary components provided in Embodiment 1. The computer program product may include a computer-readable storage medium on which computer-readable program instructions are loaded for executing the refined static ice load calculation method considering the upright structure of platform auxiliary components described in Embodiment 1.

[0086] A computer-readable storage medium can be a tangible device that holds and stores instructions for use by an instruction execution device. A computer-readable storage medium can be, for example, but not limited to, an electrical storage device, a magnetic storage device, an optical storage device, an electromagnetic storage device, a semiconductor storage device, or any combination thereof.

[0087] The computer-readable storage medium provided in the above embodiments has a similar implementation principle and technical effect to the above method embodiments, and will not be described again here.

[0088] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by a computer program. These computer programs can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that instructions executable by the processor of the computer or other programmable data processing apparatus generate instructions for implementing the flowchart. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0089] These computer programs may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0090] These computer programs may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0091] The above embodiments are only used to illustrate the present invention. The structure, connection method and manufacturing process of each component can be varied. All equivalent transformations and improvements made on the basis of the technical solution of the present invention should not be excluded from the protection scope of the present invention.

Claims

1. A refined method for calculating static ice loads considering the upright structure of platform attachment components, characterized in that, include: Obtain the dimensional parameters of the vertical structure and auxiliary components in the vertical structure of the offshore platform under test, as well as the reference ice load of the vertical structure and auxiliary components in the vertical structure of the offshore platform under test under intact ice conditions; The acquired data is input into a pre-built universal refined static ice load calculation model to obtain the refined static ice load of the vertical structure of the marine platform under test. The universal refined static ice load calculation model introduces geometric shielding coefficient, vertical structure correction coefficient, auxiliary component correction coefficient, joint failure coefficient and conservative correction coefficient.

2. The refined static ice load calculation method considering the upright structure of platform auxiliary components as described in claim 1, characterized in that, The construction process of the universal and refined static ice load calculation model is as follows: Determine the dimensional parameters of the upright structure and its attached components, as well as the basic parameters of sea ice in the target sea area; Based on the dimensional parameters of the upright structure and its auxiliary components, geometric shading coefficient, upright structure correction coefficient, auxiliary component correction coefficient and joint failure coefficient are introduced to establish ice load calculation models for single auxiliary components and multiple auxiliary components, as well as calculation models for the ultimate ice load of the upright structure considering the influence of auxiliary components. Calibration tests were conducted on each undetermined coefficient in each ice load calculation model, and ice load data under different working conditions were obtained through ice-water pool tests. Based on the basic sea ice parameters of the target sea area, the values ​​of each undetermined coefficient were obtained. Among them, the undetermined coefficients include geometric shielding coefficient, upright structure correction coefficient, auxiliary component correction coefficient, and joint failure coefficient. Based on the obtained values ​​of each undetermined coefficient, the calculation models for each ice load are optimized to obtain a universal and refined static ice load calculation model.

3. The refined static ice load calculation method considering the upright structure of platform auxiliary components as described in claim 2, characterized in that, The dimensional parameters include the diameter of the upright structure, the diameter of the auxiliary components, and the distance between the center of the main structure and the auxiliary structure.

4. The refined static ice load calculation method considering the upright structure of platform auxiliary components as described in claim 2, characterized in that, The calculation model for the ultimate ice load of a vertical structure considering the influence of auxiliary components is as follows: ； In the formula, Ultimate ice load of upright structures considering the influence of auxiliary components; For upright structures, the correction factor is used. Ice load on an upright structure under equivalent diameter conditions; The reference ice load for an upright structure under intact ice conditions; The diameter of the upright structure; Diameter of the auxiliary component; The geometric occlusion factor; The ice load calculation model for the single attached component is as follows: ； In the formula, Ice load for a single attached component, The reference ice load for a single attached component under intact ice conditions. For auxiliary components, a correction factor is used. The ice load calculation model for the multiple auxiliary components is as follows: ； In the formula, The total ice load for multiple auxiliary components, The joint damage coefficient; The designation of the auxiliary components; The number of auxiliary components; For the first The auxiliary component correction factor; For the first The reference ice load of each auxiliary component under complete ice conditions.

5. The refined static ice load calculation method considering the upright structure of platform auxiliary components as described in claim 2, characterized in that, The calibration experiments were conducted on each undetermined coefficient in each ice load calculation model, and ice load data under different working conditions were obtained through ice-water tank tests. Based on the determined basic sea ice parameters of the target sea area, the values ​​of each undetermined coefficient were obtained, including: The calibration tests are divided into two categories: single-attached-component configuration and multi-attached-component configuration. Based on the single-attached component configuration and the multi-attached component configuration, calibration tests were carried out on each undetermined coefficient in each ice load calculation model. Based on the total ice load and the ice load on the upright structure under different attached component configuration conditions, the values ​​of geometric shading coefficient, upright structure correction coefficient, attached component correction coefficient and joint failure coefficient were obtained.

6. The refined static ice load calculation method considering the upright structure of platform auxiliary components as described in claim 2, characterized in that, Based on the obtained values ​​of each undetermined coefficient, the ice load calculation models are optimized to obtain a universal and refined static ice load calculation model, including: Two complex and typical vertical structures with multiple auxiliary components from actual engineering projects were selected, and verification models were designed. Using the designed verification model, and based on the same scaling ratio and the values ​​of each undetermined coefficient, three series of ice-water pool verification tests were carried out on each ice load calculation model. The theoretical calculation value of static ice load of the verification model is compared with the experimental measured value of the constructed ice load calculation model. If the deviation rate does not meet the requirements, a conservative correction coefficient is introduced. Based on conservative correction coefficients, the calculation models for each ice load are optimized to obtain a universal and refined static ice load calculation model.

7. The refined static ice load calculation method considering the upright structure of platform auxiliary components as described in claim 1, characterized in that, The universal and refined static ice load calculation model is as follows: ； In the formula, For the precise static ice load of the vertical structure of the offshore platform; Ultimate ice load of upright structures considering the influence of auxiliary components; The total ice load for multiple auxiliary components; This is a conservative correction factor; The reference ice load for an upright structure; For upright structures, the correction factor is used. The diameter of the upright structure; The geometric occlusion factor; Diameter of the auxiliary component; The joint damage coefficient; The designation of the auxiliary components; The number of auxiliary components; For the first The auxiliary component correction factor; For the first The reference ice load of each auxiliary component under complete ice conditions.

8. A refined static ice load calculation device considering the upright structure of platform attachment components, characterized in that, include: The data acquisition module is used to acquire the dimensional parameters of the vertical structure and auxiliary components in the vertical structure of the marine platform under test, as well as the reference ice load of the vertical structure and auxiliary components in the vertical structure of the marine platform under test under the condition of intact ice. The refined static ice load calculation module is used to input the acquired data into a pre-built universal refined static ice load calculation model to obtain the refined static ice load of the vertical structure of the marine platform under test. The universal refined static ice load calculation model introduces geometric shielding coefficient, vertical structure correction coefficient, auxiliary component correction coefficient, joint failure coefficient and conservative correction coefficient.

9. A processing device, characterized in that, The system includes a computer program, which, when executed by a processing device, is used to implement the steps corresponding to the refined static ice load calculation method considering the upright structure of platform attachment components as described in any one of claims 1-7.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program, wherein when the computer program is executed by a processor, it is used to implement the steps corresponding to the refined static ice load calculation method considering the upright structure of the platform attachment components as described in any one of claims 1-7.

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