A calculation method for selecting the structural system of a super-large span navigation aqueduct

Abstract

The present invention discloses a method for calculating the type selection of a super-large span navigable aqueduct structure system, which belongs to the technical field of water conservancy engineering, and includes the following steps: establishing a super-large span navigable aqueduct structure bridge type library; preliminarily selecting a suitable bridge type in the bridge type library; setting two-level calculation indicators; determining a weight matrix; establishing a corresponding evaluation calculation method for each level II indicator; constructing a relationship matrix of each suitable bridge type; calculating and obtaining a comprehensive score of each suitable bridge type; and selecting the final aqueduct structure scheme according to the comprehensive score. The present invention comprehensively considers a variety of factors, and considers the mutual influence between the multiple factors, and can select the optimal aqueduct structure scheme; improves the scientificity and systematicness of aqueduct design, and optimizes the performance of aqueduct structure; helps to reduce engineering costs, shorten construction periods, and improve engineering economic benefits.

Description

Technical Field

[0001] The invention relates to the technical field of water conservancy engineering, and in particular to a method for calculating the type selection of a super-large-span navigation aqueduct structure system. Background Art

[0002] As a key structure for conveying water in water conservancy projects, the design and selection of aqueducts are of great significance to ensure smooth water flow and reduce energy loss. Traditional aqueduct designs are often based on empirical formulas and standard atlases, lacking pertinence and systematicness.

[0003] With the rapid development of water conservancy projects, the application of super-large span navigable aqueducts (navigable aqueducts with a span greater than 100m) in actual engineering is increasing. These navigable aqueducts not only need to meet the water conveyance needs of large spans and large flows, but also need to ensure navigation safety and the economy of the structure. As a special structure, super-large span navigable aqueducts have many design constraint boundaries, including navigation needs, water conveyance capacity, economic and mechanical indicators, etc. It is crucial to comprehensively consider multiple constraints and determine a reasonable structural type. Therefore, developing a new super-large span aqueduct selection method can optimize the design according to specific engineering conditions, which has important practical value and promotion prospects. To this end, a super-large span navigable aqueduct structural system selection calculation method is proposed. Summary of the invention

[0004] The technical problem to be solved by the present invention is: how to optimize the design according to specific engineering conditions and then select the optimal aqueduct structure scheme, and provide a selection calculation method for a super-large span navigable aqueduct structure system. According to the structural and functional characteristics of the navigable aqueduct, by comprehensively considering multiple factors and multiple goals, it is a selection calculation method that considers structural safety, function and economy.

[0005] The present invention solves the above technical problems through the following technical solutions, and the present invention comprises the following steps:

[0006] Step S1: Establish a super-large span navigation aqueduct structure bridge type library, including n types of bridge types: , for each bridge type, applicable parameters are given: the upper and lower limits of span, the upper and lower limits of water conveyance capacity, and the upper and lower limits of aqueduct navigation grade;

[0007] Step S2: According to the project construction requirements, preliminarily determine the design span L, design flow S, and navigation level N of the navigable aqueduct, and preliminarily select m applicable bridge types from the bridge type library established in step S1 based on the applicable parameters of each bridge type. ;

[0008] Step S3: according to the use function and stress characteristics of the navigable aqueduct, two-level calculation indicators are set, the two-level calculation indicators are level I indicators and level II indicators, and the level I indicators are divided into multiple level II indicators;

[0009] Step S4: Determine the weight matrix of the two-level calculation indicators by integrating expert opinions, owner investment and design experience;

[0010] Step S5: For each set level II indicator, a corresponding evaluation calculation method is established;

[0011] Step S6: For each of the m initially selected applicable bridge types , construct a relationship matrix;

[0012] Step S7: Based on the weight matrix of the two-level calculation index and the relationship matrix in step S6, the bridge type The overall score of

[0013] Step S8: According to each bridge type According to the comprehensive score, each bridge type scheme is ranked, and the bridge type scheme with the highest comprehensive score is selected as the final aqueduct structure scheme.

[0014] Furthermore, in step S3, the level I indicators include safety ,Function , Cost , Level I indicators constitute a set ;

[0015] Each level I indicator is divided into level II indicators, among which safety There are three level II indicators, including applicable span ,robustness , constant activity ratio ;Function There are three level II indicators, including temperature adaptability , Aqueduct navigation level , Design flow Cost There are three level II indicators, including material costs , Construction costs , maintenance forecast cost ; Level II indicator composition matrix , Take 1, 2, or 3.

[0016] Furthermore, in step S4, the level I indicator weight matrix , Respectively indicate indicators , , The weight value of the second-level indicator weight matrix , Respectively indicate indicators , , The weight value of .

[0017] Furthermore, in step S5, the specific evaluation calculation method is as follows:

[0018] For level II indicators, the applicable span , Bridge Type Applicable span evaluation index The calculation formula is:

[0019] ;

[0020] in, Indicates the lower limit of the span, Indicates the upper limit of the span;

[0021] For level II indicators, robustness , Bridge Type Robustness evaluation index The calculation formula is:

[0022] ;

[0023] in, Indicates the length of the component, represents the cross-sectional area of ​​the component, Indicates the stretched or shortened length of a component under normal use. Indicates the maximum length of the allowable deformation of the component. represents the bending moment of inertia of the component, Indicates the bending displacement of the component under normal use. for The second-order derivative of It indicates the limit displacement of the member's allowable bending. for The second derivative of .

[0024] For level II indicators, constant activity ratio , Bridge Type Evaluation index of constant activity ratio The calculation formula is as follows:

[0025] ;

[0026] in, is the displacement caused by the dead load at the mid-span of the main span, is the displacement caused by water flow load, , , represents the elastic modulus of the component, , It represents the bending moment and axial force of the component caused by the water flow load. , represents the bending moment and axial force of the component caused by the dead load, , It represents the bending moment and axial force of the member caused by the unit force applied in the main span;

[0027] Temperature adaptability for level II indicators , Bridge Type Temperature adaptability evaluation index The calculation formula is as follows:

[0028] ;

[0029] in, is the linear expansion coefficient of the main material, is the temperature difference between the inside and outside of the aqueduct, is the number of longitudinal constraints of the aqueduct;

[0030] For the navigation level of the II-level indicator aqueduct , Bridge Type Evaluation index of aqueduct navigation grade The calculation formula is as follows:

[0031] ;

[0032] in, is the lower limit of the aqueduct’s navigability level. The upper limit of the aqueduct's navigability level;

[0033] For the design flow of level II indicators , Bridge Type Design flow evaluation index The calculation formula is as follows:

[0034] ;

[0035] in, To design the required flow, is the roughness of the trough body, P is the cross-sectional area of ​​the trough body, R is the hydraulic radius, and r is the gradient of the trough bottom;

[0036] For the material cost of level II indicators , Construction costs Maintenance cost forecast , respectively establish bridge type Material cost evaluation index , Construction cost evaluation indicators Evaluation index of maintenance forecast cost The calculation method is: arrange the costs from low to high, assign 100 to the lowest cost, assign 60 to the highest cost, and use linear interpolation to calculate the scores for the remaining costs.

[0037] Furthermore, in step S6, the bridge type The relationship matrix is ​​as follows:

[0038] ;

[0039] ;

[0040] .

[0041] Furthermore, in step S7, the comprehensive score is as follows:

[0042] .

[0043] Compared with the prior art, the present invention has the following advantages:

[0044] 1. Comprehensively consider multiple factors and the mutual influence between multiple factors to select the optimal aqueduct structure solution;

[0045] 2. Improved the scientificity and systematicness of aqueduct design and optimized the performance of aqueduct structure;

[0046] 3. It helps to reduce project costs, shorten construction period and improve project economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 It is a flow chart of the calculation method for selecting the structure system of the super-large span navigation aqueduct of the present invention. DETAILED DESCRIPTION

[0048] The following is a detailed description of an embodiment of the present invention. This embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation method and a specific operation process are given, but the protection scope of the present invention is not limited to the following embodiment.

[0049] Embodiment 1

[0050] like Figure 1 As shown, this embodiment provides a technical solution: a method for calculating the selection of a super-large span navigation aqueduct structure system, comprising the following steps:

[0051] Step S1: Establish a super-large span navigation aqueduct structure bridge type library, including n types of bridge types: , for each bridge type, applicable parameters are given: the upper and lower limits of span, the upper and lower limits of water conveyance capacity, and the upper and lower limits of aqueduct navigation grade;

[0052] Step S2: According to the project construction requirements, preliminarily determine the design span L, design flow S, and navigation level N of the navigable aqueduct, and preliminarily select m applicable bridge types from the bridge type library established in step S1 based on the applicable parameters of each bridge type. ;

[0053] Step S3: according to the use function and stress characteristics of the navigable aqueduct, two-level calculation indicators are set, the two-level calculation indicators are level I indicators and level II indicators, and the level I indicators are divided into multiple level II indicators;

[0054] Step S4: Determine the weight matrix of the two-level calculation indicators by integrating expert opinions, owner investment and design experience;

[0055] Step S5: For each set level II indicator, a corresponding evaluation calculation method is established;

[0056] Step S6: For each of the m initially selected applicable bridge types , construct a relationship matrix;

[0057] Step S7: Based on the weight matrix of the two-level calculation index and the relationship matrix in step S6, the bridge type The overall score of

[0058] Step S8: According to each bridge type According to the comprehensive score, each bridge type scheme is ranked, and the bridge type scheme with the highest comprehensive score is selected as the final aqueduct structure scheme.

[0059] In this embodiment, in step S3, the level I indicators include safety ,Function , Cost , Level I indicators constitute a set ;

[0060] Each level I indicator is divided into level II indicators, among which safety There are three level II indicators, including applicable span ,robustness , constant activity ratio ;Function There are three level II indicators, including temperature adaptability , Aqueduct navigation level , Design flow Cost There are three level II indicators, including material costs , Construction costs , maintenance forecast cost ; Level II indicator composition matrix , Take 1, 2, or 3.

[0061] In this embodiment, in step S4, the level I indicator weight matrix , Respectively indicate indicators , , The weight value of the second-level indicator weight matrix , Respectively indicate indicators , , The weight value of .

[0062] In this embodiment, in step S5, the specific evaluation calculation method is as follows:

[0063] For level II indicators, the applicable span , Bridge Type Applicable span evaluation index The calculation formula is:

[0064] ;

[0065] in, Indicates the lower limit of the span, Indicates the upper limit of the span;

[0066] For level II indicators, robustness , Bridge Type Robustness evaluation index The calculation formula is:

[0067] ;

[0068] in, Indicates the length of the component, represents the cross-sectional area of ​​the component, Indicates the stretched or shortened length of a component under normal use. Indicates the maximum length of the allowable deformation of the component. represents the bending moment of inertia of the component, Indicates the bending displacement of the component under normal use. for The second-order derivative of It indicates the limit displacement of the member's allowable bending. for The second derivative of .

[0069] For level II indicators, constant activity ratio , Bridge Type Evaluation index of constant activity ratio The calculation formula is as follows:

[0070] ;

[0071] in, is the displacement caused by the dead load at the mid-span of the main span, is the displacement caused by water flow load, , , represents the elastic modulus of the component, , It represents the bending moment and axial force of the component caused by the water flow load. , represents the bending moment and axial force of the component caused by the dead load, , It represents the bending moment and axial force of the member caused by the unit force applied in the main span;

[0072] Temperature adaptability for level II indicators , Bridge Type Temperature adaptability evaluation index The calculation formula is as follows:

[0073] ;

[0074] in, is the linear expansion coefficient of the main material, is the temperature difference between the inside and outside of the aqueduct, is the number of longitudinal constraints of the aqueduct;

[0075] For the navigation level of the II-level indicator aqueduct , Bridge Type Evaluation index of aqueduct navigation grade The calculation formula is as follows:

[0076] ;

[0077] in, is the lower limit of the aqueduct’s navigability level. The upper limit of the aqueduct's navigability level;

[0078] For the design flow of level II indicators , Bridge Type Design flow evaluation index The calculation formula is as follows:

[0079] ;

[0080] in, To design the required flow, is the roughness of the trough body, P is the cross-sectional area of ​​the trough body, R is the hydraulic radius, and r is the gradient of the trough bottom;

[0081] For the material cost of level II indicators , Construction costs Maintenance cost forecast , respectively establish bridge type Material cost evaluation index , Construction cost evaluation indicators Evaluation index of maintenance forecast cost The calculation method is: arrange the costs from low to high, assign 100 to the lowest cost, assign 60 to the highest cost, and use linear interpolation to calculate the scores for the remaining costs.

[0082] In this embodiment, in step S6, the bridge type The relationship matrix is ​​as follows:

[0083] ;

[0084] ;

[0085] .

[0086] In this embodiment, in step S7, the comprehensive score is as follows:

[0087] .

[0088] Embodiment 2

[0089] The method in Example 1 is further described below with reference to actual cases:

[0090] Create a bridge type library: Q={Q1, Q2...Q n}; According to the actual engineering requirements, the design requirement span L=150m, the design requirement flow S=100m³ / s, and the aqueduct navigation level U=3 are determined. The bridge types that meet the design requirements are selected from the bridge type library: Q1, Q2, and Q3. The applicable parameters of bridge type Q1 are: span (110~160)m, water transfer capacity (70-120)m³ / s, and aqueduct navigation level (1-3); the applicable parameters of bridge type Q2 are: span (130~180)m, water transfer capacity (80-140)m³ / s, and aqueduct navigation level (1-4); the applicable parameters of bridge type Q3 are: span (100~150)m, water transfer capacity (90-145) m³ / s, and aqueduct navigation level (3-5).

[0091] Set two levels of calculation indicators. Level I indicators include safety ,Function , Cost ; Level I indicators constitute a set Each level I indicator is divided into level II indicators, safety There are three level II indicators, including applicable span ,robustness , constant activity ratio (Ratio of dead load to live load, dead load is the dead weight of the structure, live load is the water load); Function There are three level II indicators, including temperature adaptability , Aqueduct navigation level , Design flow Cost There are 3 Level II indicators, including material costs , Construction costs , maintenance forecast cost . Level II indicators constitute the matrix .

[0092] Based on expert opinions, owner investment and design experience, the weight matrix is ​​determined: Level I indicator weight matrix , weight matrix of level II indicators , , .

[0093] Calculate the evaluation score of the Level II index of bridge type Q1: , , ; , , ; , , ;

[0094] Calculate the evaluation score of the Level II index of bridge type Q2: , , ; , , ; , , ;

[0095] Calculate the evaluation score of the Level II index of bridge type Q3: , , ; , , ; , , ;

[0096] The relationship matrices of bridge types Q1, Q2, and Q3 are:

[0097]

[0098] The comprehensive evaluation of bridge types Q1, Q2 and Q3 are:

[0099]

[0100] Q1, Q2, and Q3 are arranged, and Q2 with the highest comprehensive score is selected as the final aqueduct structure solution.

[0101] Embodiment 3

[0102] This embodiment provides a computer-readable storage medium on which a computer program is stored. When the program is executed by a processor, the selection calculation method in the first embodiment is implemented.

[0103] The computer-readable storage medium may include flash memory, hard disk, multimedia card, card-type memory (e.g., SD or DX memory, etc.), random access memory (RAM), static random access memory (SRAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), programmable read-only memory (PROM), magnetic memory, disk, optical disk, etc. In some embodiments, the storage medium may be an internal storage unit of a computer device, such as a hard disk or memory of the computer device. In other embodiments, the storage medium may also be an external storage device of a computer device, such as a plug-in hard disk equipped on the computer device, a smart memory card (Smart Media Card, SMC), a secure digital (Secure Digital, SD) card, a flash card (Flash Card), etc. Of course, the storage medium may also include both an internal storage unit of a computer device and an external storage device thereof. In this embodiment, the memory is generally used to store an operating system and various application software installed on the computer device, etc. In addition, the memory may also be used to temporarily store various types of data that have been output or are to be output.

[0104] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A method for calculating the type selection of a super-large span navigation aqueduct structure system, characterized in that: The following steps are involved: Step S1: Establish a super-large span navigation aqueduct structure bridge type library, including n types of bridge types: , for each bridge type, applicable parameters are given: the upper and lower limits of span, the upper and lower limits of water conveyance capacity, and the upper and lower limits of aqueduct navigation grade; Step S2: According to the project construction requirements, preliminarily determine the design span L, design flow S, and navigation level N of the navigable aqueduct, and preliminarily select m applicable bridge types from the bridge type library established in step S1 based on the applicable parameters of each bridge type. ; Step S3: according to the use function and stress characteristics of the navigable aqueduct, two-level calculation indicators are set, the two-level calculation indicators are level I indicators and level II indicators, and the level I indicators are divided into multiple level II indicators; Step S4: Determine the weight matrix of the two-level calculation indicators by integrating expert opinions, owner investment and design experience; Step S5: For each set level II indicator, a corresponding evaluation calculation method is established; Step S6: For each of the m initially selected applicable bridge types , construct a relationship matrix; Step S7: Based on the weight matrix of the two-level calculation index and the relationship matrix in step S6, the bridge type The overall score of Step S8: According to each bridge type According to the comprehensive scores, each bridge type scheme is ranked, and the bridge type scheme with the highest comprehensive score is selected as the final aqueduct structure scheme; In step S3, the level I indicators include safety ,Function , Cost , Level I indicators constitute a set ; Each level I indicator is divided into level II indicators, among which safety There are three level II indicators, including applicable span ,robustness , constant activity ratio ;Function There are three level II indicators, including temperature adaptability , Aqueduct navigation level , Design flow Cost There are three level II indicators, including material costs , Construction costs , maintenance forecast cost ; Level II indicator composition matrix , Choose 1, 2 or 3; In step S4, the level I indicator weight matrix , Respectively indicate indicators , , The weight value of the second-level indicator weight matrix , Respectively indicate indicators , , The weight value of In step S6, the bridge type The relationship matrix is ​​as follows: ； ； ； In step S7, the comprehensive score is as follows: 。 2. The method for calculating the type selection of a super-long span navigation aqueduct structure system according to claim 1 is characterized in that: In step S5, the specific evaluation calculation method is as follows: For level II indicators, the applicable span , Bridge Type Applicable span evaluation index The calculation formula is: ； in, Indicates the lower limit of the span, Indicates the upper limit of the span; For level II indicators, robustness , Bridge Type Robustness evaluation index The calculation formula is: ； in, Indicates the length of the component, represents the cross-sectional area of ​​the component, Indicates the stretched or shortened length of a component under normal use. Indicates the maximum length of the allowable deformation of the component. represents the bending moment of inertia of the component, Indicates the bending displacement of the component under normal use. for The second-order derivative of It indicates the limit displacement of the member's allowable bending. for The second derivative of For level II indicators, constant activity ratio , Bridge Type Evaluation index of constant activity ratio The calculation formula is as follows: ； in, is the displacement caused by the dead load at the mid-span of the main span, is the displacement caused by water flow load, , , represents the elastic modulus of the component, , It represents the bending moment and axial force of the component caused by the water flow load. , represents the bending moment and axial force of the component caused by the dead load, , It represents the bending moment and axial force of the member caused by the unit force applied in the main span; Temperature adaptability for level II indicators , Bridge Type Temperature adaptability evaluation index The calculation formula is as follows: ； in, is the linear expansion coefficient of the main material, is the temperature difference between the inside and outside of the aqueduct, is the number of longitudinal constraints of the aqueduct; For the navigation level of the II-level indicator aqueduct , Bridge Type Evaluation index of aqueduct navigation grade The calculation formula is as follows: ； in, is the lower limit of the aqueduct’s navigability level. The upper limit of the aqueduct's navigability level; For the design flow of level II indicators , Bridge Type Design flow evaluation index The calculation formula is as follows: ； in, To design the required flow, is the groove body roughness, P is the cross-sectional area of ​​the tank body through which water passes. R is the hydraulic radius, r is the trough bottom gradient; For the material cost of level II indicators , Construction costs Maintenance cost forecast , respectively establish bridge type Material cost evaluation index , Construction cost evaluation indicators Evaluation index of maintenance forecast cost The calculation method is: arrange the costs from low to high, assign 100 to the lowest cost, assign 60 to the highest cost, and use linear interpolation to calculate the scores for the remaining costs.

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