Staggered stacked container structure risk assessment method and device
By constructing a container structure model and conducting finite element modeling and static analysis, the accuracy problem of risk assessment of container misaligned stacking structure was solved, and the accuracy and safety of the assessment were improved.
Patent Information
- Application Number
- CN202510664198.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-22
- Publication Date
- 2025-10-03
Smart Images
Figure CN120745274A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the fields of structural engineering and mechanics technology, and in particular to a method and device for risk assessment of misaligned stacked containers. Background Art
[0002] When space is limited, staggered stacking of containers can increase the number of containers placed within the same footprint, making more efficient use of vertical space. However, improper staggered stacking can easily lead to stress concentration in certain parts of the structure.
[0003] Currently, when assessing the structural risks of misaligned container stacking, personnel typically rely on experience and structural formulas to perform static analysis to determine whether the outward displacement of the containers during misalignment poses a structural risk. However, this method relies heavily on manual operation and has numerous drawbacks. Manual calculations are prone to errors due to negligence or insufficient consideration of complex situations. Inaccurate calculations can cause stresses at container joints to far exceed design limits, potentially leading to material yield or even fracture, seriously threatening the safety of the entire stacking structure.
[0004] Therefore, how to accurately assess the structural risk of misaligned stacked containers is a technical problem that needs to be urgently solved by those skilled in the art. Summary of the Invention
[0005] In order to improve the accuracy of risk assessment of a misaligned stacked container structure, the present invention provides a risk assessment method for a misaligned stacked container structure.
[0006] In a first aspect, the present application provides a method for risk assessment of misaligned stacked containers, which adopts the following technical solution:
[0007] A method for risk assessment of misaligned stacked container structures, comprising:
[0008] S1. Obtaining structural information of a container, information about cabinets inside the container, and information about predicted passengers; wherein the container includes a staggered container and related containers in contact with it; the cabinet information includes the location, shape, and material of each cabinet; and the predicted passenger information includes the number, weight, and location of passengers expected to be simultaneously carried by the staggered container;
[0009] S2. Constructing a placement structure model of the container based on the structure information, the cabinet information, and the predicted load-carrying personnel information;
[0010] S3. Simplifying the placement structure model, and performing finite element modeling based on the simplified placement structure model to obtain a simulation model of the container;
[0011] S4. Performing a static analysis on the simulation model, and obtaining the maximum structural stress of the misplaced containers and the maximum structural deflection of the bottommost container roof according to the analysis results;
[0012] S5. Match the maximum structural stress and the maximum structural deflection with a preset safety range, and perform a structural risk assessment on the misplaced container based on the matching result.
[0013] In a preferred embodiment, the present application may be further configured such that, when simplifying the placement structure model, the specific steps of step S3 are:
[0014] S301, identifying and removing structural redundant features in the placement structure model;
[0015] S302: Remove the front and rear door panels of all containers and the attached micro-components of the cabinets located inside the misplaced container from the placement structure model.
[0016] In a preferred embodiment of the present application, the specific steps of step S3 are as follows:
[0017] S311, assigning corresponding equivalent densities in the placement structure model based on the actual weights of the container and the cabinet, and performing meshing on the placement structure model;
[0018] S312. Obtain material parameters, connection methods, and ground installation methods of all containers and cabinets; wherein the connection methods include the connection methods between the relevant containers and the staggered containers and the connection methods between the cabinets and the staggered containers;
[0019] S313. Setting the attribute parameters of each container and cabinet in the grid-divided placement structure model according to the material parameters and the connection method, and constraining the degrees of freedom of the relevant containers in the bottom layer according to the ground installation method to obtain a simulation model.
[0020] In a preferred embodiment, the present application can be further configured as follows: Step S5 includes the following specific steps:
[0021] S501, obtaining the yield strength of the steel plate from the material parameters, calculating the difference between the maximum stress of the structure and the yield strength of the steel plate, comparing the difference with a first required range in a preset safety range, and obtaining a comparison result;
[0022] S502: Calculate the ratio of the maximum deflection of the structure to the minimum span of the bottom container roof, compare the ratio with a second required range in the preset safety range, and obtain a comparison result;
[0023] S503: If the difference is within the first requirement range, and the ratio is within the second requirement range, then determine that the structure of the misplaced containers is risk-free.
[0024] In a preferred embodiment of the present application, the method may be further configured such that, after step S5, the method further includes:
[0025] S6. Predicting the external force influencing factors of the container, and determining a recommended outward moving distance of the misplaced container based on the prediction result and the result of the structural risk assessment.
[0026] In a second aspect, the present application provides a device for risk assessment of misaligned stacked containers, which adopts the following technical solution:
[0027] An information acquisition module is configured to acquire structural information of a container, information about cabinets within the container, and information about predicted passengers; wherein the container includes a staggered container and related containers in contact with the container; the cabinet information includes the location, shape, and material of each cabinet; and the predicted passenger information includes the number, weight, and location of passengers that the staggered container is expected to simultaneously carry.
[0028] A placement structure model building module, configured to build a placement structure model of the container based on the structure information, the cabinet information, and the predicted load-carrying personnel information;
[0029] a simulation model building module, configured to simplify the placement structure model and perform finite element modeling based on the simplified placement structure model to obtain a simulation model of the container;
[0030] A static analysis module, configured to perform a static analysis on the simulation model and obtain, based on the analysis results, the maximum structural stress of the misplaced containers and the maximum structural deflection of the bottommost container roof;
[0031] The structural risk assessment module is used to match the maximum structural stress and the maximum structural deflection with a preset safety range, and perform a structural risk assessment on the misplaced container based on the matching result.
[0032] In summary, this application has the following beneficial technical effects:
[0033] Constructing a placement structure model based on the acquired structural information of the container, the cabinet information inside the container, and the predicted information of the people carried can enable the placement structure model to accurately reflect the relative positions of each container in the misaligned stacked container and the distribution of the cabinets and people in the container; performing finite element modeling on the placement structure model can enable the simulation model to reflect the material properties, stress conditions, and constraints of each component in the misaligned stacked container, thereby making the static analysis in the simulation model closer to the actual use of the misaligned stacked container. Therefore, the structural risk assessment results obtained based on the static analysis results in the simulation model will be more in line with the actual situation. Compared with the manual stress analysis method in the related art, the present application can simulate the actual stress conditions of the misaligned stacked container by constructing a simulation model of the misaligned stacked container, so as to improve the accuracy of the static analysis results of the misaligned stacked container, thereby improving the accuracy of the structural risk assessment of the misaligned stacked container. BRIEF DESCRIPTION OF THE DRAWINGS
[0034] Figure 1 This is a schematic diagram of the placement structure model provided in Example 1 of the present application;
[0035] Figure 2 This is a schematic diagram of the finite element modeling results of a container provided in Example 1 of the present application;
[0036] Figure 3 It is a schematic diagram of the static analysis results of the container simulation model provided in Example 1 of the present application. DETAILED DESCRIPTION
[0037] In order to make the purpose, technical solutions and advantages of the present application clearer, the specific embodiments of the present application are further described in detail below in conjunction with the accompanying drawings. It is understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application. It should also be noted that, for ease of description, only parts related to the present application, not all of the contents, are shown in the accompanying drawings. Before discussing the exemplary embodiments in more detail, it should be mentioned that some exemplary embodiments are described as processes or methods depicted as flow charts. Although the flow charts describe each operation (or step) as a sequential process, many of the operations therein can be implemented in parallel, concurrently or simultaneously. In addition, the order of the operations can be rearranged. The process can be terminated when its operation is completed, but can also have additional steps not included in the accompanying drawings. The process can correspond to a method, function, procedure, subroutine, subprogram, etc.
[0038] The following will be combined with the accompanying drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the embodiments described are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field are within the scope of protection of this application.
[0039] The terms "first," "second," and the like in the specification and claims of this application are used to distinguish similar objects, and are not used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of this application can be implemented in an order other than that illustrated or described herein, and that the objects distinguished by "first," "second," and the like are generally of the same type, and do not limit the number of objects; for example, the first object can be one or more. In addition, the term "and / or" in the specification and claims refers to at least one of the connected objects, and the character " / " generally indicates that the objects connected are in an "or" relationship.
[0040] The following describes in detail a method and device for risk assessment of misaligned stacked containers provided by an embodiment of the present application through specific embodiments and application scenarios in conjunction with the accompanying drawings.
[0041] Example 1
[0042] The present application provides a method for assessing the structural risk of misaligned stacked containers, which is performed by an electronic device, which can be a server or a terminal device. The server can be an independent physical server, a server cluster or distributed system composed of multiple physical servers, or a cloud server for cloud computing services. The terminal device can be a smartphone, tablet computer, laptop computer, desktop computer, etc., but is not limited thereto. The terminal device and the server can be directly or indirectly connected via wired or wireless communication, which is not limited in the present application embodiment. The method includes steps S1, S2, S3, S4, and S5, wherein:
[0043] S1. Obtaining structural information of a container, information about cabinets inside the container, and information about predicted passengers; wherein the container includes a staggered container and related containers in contact with it; the cabinet information includes the location, shape, and material of each cabinet; and the predicted passenger information includes the number, weight, and location of passengers expected to be simultaneously carried by the staggered container;
[0044] A container is a group of tools that can transport packaged or unpackaged goods and facilitate loading, unloading, and handling using mechanical equipment. In this solution, the container serves as an external load-bearing frame, supporting and protecting the cabinets, equipment, and possible personnel activities (such as office staff and visitors) inside. Therefore, the container needs to withstand its own weight, the weight of the equipment inside, the loads generated by personnel activities, and external forces (such as wind loads) that may act on it under various environmental conditions, providing a relatively closed and stable spatial environment for the internal equipment to ensure its safe operation.
[0045] Structural information may include information such as the relative positional relationship and connection relationship between the staggered container and related containers. In this solution, the staggered stacked containers are stacked in a three-layer structure, consisting of a bottom-layer related container, a staggered container, and a top-layer related container. The second-layer staggered container is offset outward from the two related containers, for example, by 1.5 meters.
[0046] Cabinets provide stable installation locations and spatial layouts for various devices within containers, allowing for orderly arrangement of devices and facilitating wiring, heat dissipation, and maintenance management. Different types of cabinets house equipment with different functions, such as IT cabinets for servers and other information processing equipment, and battery cabinets for backup power supplies. The position of the cabinets within the staggered container and their weight affect the force distribution within the container. For example, if the cabinets are heavy and concentrated on the outward-extending side of the staggered container, the force exerted on the upper container is greater, and the staggered container is at risk of tipping over. Capturing the cabinet's shape helps make subsequent container simulation models more realistic.
[0047] Predicted passenger information can be derived from the distribution of people within a container by predicting and simulating the number, weight, and position of office workers and visitors within the container based on daily container usage. To improve the structural safety of misaligned containers, the model builds on the position of the people who have the greatest impact on the structural stability of the misaligned containers. For example, assuming there are 20 visitors on the second floor, each weighing 100 kg, the force is applied at the outermost point of the misaligned containers on the second floor, based on the maximum torque.
[0048] The method for obtaining the structural information of the container, the cabinet information inside the container, and the predicted information of the number of people carried can be that the technical staff sets the parameters such as the structural information of the container, the cabinet information inside the container, and the predicted information of the number of people carried in advance through electronic equipment, and gives the relative outward displacement distance between the staggered container and the two related containers. The electronic equipment builds a simulation model and evaluates the structural risk according to the information input by the technical staff.
[0049] S2. Constructing a placement structure model of the container based on the structure information, the cabinet information, and the predicted load-carrying personnel information;
[0050] The placement structure model can be a model that is preliminarily established based on the acquired structural information, cabinet information, and predicted load-bearing personnel information to represent the structural framework such as the shape and relative setting position of the container and the cabinets inside the container. The placement structure model can also mark the predicted load-bearing personnel's outermost action point on the misplaced container.
[0051] The method of constructing the container placement structure model can be to obtain the shape and relative position of each container and cabinet based on the structural information and cabinet information, establish the model of each container and cabinet according to the shape of each container and cabinet, and assemble the models of each container and cabinet according to the relative position relationship to obtain the container placement structure model.
[0052] For example, Figure 1 This is a schematic diagram of the placement structure model provided in Example 1 of this application. Figure 1 As shown, first, according to the shapes of the containers and cabinets, the models of the relevant container 1, the relevant container 2, the staggered container, and each cabinet are built. Then, according to the relative position relationship between the containers and the cabinets, the models of the relevant container 1, the relevant container 2, the staggered container, and each cabinet are assembled. That is, the relevant container 1, the staggered container, and the relevant container 2 are stacked in sequence, and the staggered container is offset according to the relative outward movement of the two relevant containers. Then, the cabinet model is placed at the corresponding position in the container to obtain the placement structure model. It can be understood that the placement structure model should be a three-dimensional model. Figure 1 This is just a schematic diagram of one perspective of the placement structure model.
[0053] S3. Simplifying the placement structure model, and performing finite element modeling based on the simplified placement structure model to obtain a simulation model of the container;
[0054] Finite element modeling is a technique that uses mathematical approximations to simulate real physical systems (geometry and load conditions). For example, Figure 2This is a schematic diagram of the container finite element modeling results provided in Example 1 of this application. Figure 2 As shown in Figure 1, the general process for solving problems using finite element modeling is to transform the real physical system into a mathematical model, discretizing the continuous object into a finite number of elements (the smaller the element, the closer the solution is to the exact value). These elements are connected through nodes. A mechanical equation is established for each element, and the physical problem is transformed into a system of algebraic equations using methods such as the variational principle or the weighted residual method. Solving these equations yields results such as displacement, stress, and strain at the nodes, and then using interpolation functions to calculate physical quantities at other locations within the element.
[0055] The way to simplify the placement structure model is to fine-tune the irregular model shape in the placement structure model. Under the premise of ensuring that its force distribution is not affected, the placement structure model can be fuzzy modeled to make its shape regular, remove redundant structures, and only retain the cabinet frame to increase the ornamental value of the placement structure model and avoid the simulation model being too cluttered during the subsequent static analysis, which affects the reading of the analysis results.
[0056] A simulation model of a container can be obtained by setting density attributes for the corresponding container model and cabinet model in the structural placement model according to their actual weights, discretizing the complex geometric model in the placement structure model into multiple small units, setting corresponding textures for the models of the container and cabinet according to their materials, and improving the force characteristics of each small unit in the link position according to the connection method between containers and containers, and cabinets and containers, thereby obtaining a simulation model of staggered stacked containers that contains both structural information and attribute information.
[0057] On the basis of the above solution, optionally, when simplifying the placement structure model, the specific steps of step S3 are:
[0058] S301, identifying and removing structural redundant features in the placement structure model;
[0059] Structural redundancy features include chamfers, fillets, and process holes, which have little or no impact on the static analysis of containers. A chamfer is a transitional feature on the edge of a part or object, created by removing material or machining to transform a sharp corner into a transitional structure with a certain slope or curvature. Chamfers are primarily used to remove burrs from part edges to improve safety, enhance appearance, and facilitate smooth assembly during mechanical assembly. A fillet is a shape that transforms a sharp edge into a circular transition through machining or design. Its characteristics are determined by the fillet radius, which determines the curvature of the arc and the smoothness of the transition. Fillets prevent scratches or bruises during contact, make objects appear rounder and smoother, and enhance their overall aesthetics and refinement. A process hole is a hole intentionally machined during part machining or assembly to meet process requirements such as positioning, guidance, weight reduction, or ventilation.
[0060] A method for identifying and removing redundant structural features in the placed structure model can be to pre-learn the structural characteristics of redundant structural features such as chamfers, fillets, and process holes in the model, match model parts with consistent characteristics in the placed structure model based on the learned structural characteristics, and filter out redundant structural features such as chamfers, fillets, and process holes based on the connection relationship between the model part and the overall structure in which it is located, so as to obtain container models and cabinet models with more regular shapes.
[0061] S302: Remove the front and rear door panels of all containers and the attached micro-components of the cabinets located inside the misplaced container from the placement structure model.
[0062] The method of removing the front and rear door panels of all containers can be to identify the misplaced container and the two smallest door panels in the relevant containers and remove them, thereby retaining the frame, side panels, top panel and bottom panel of each container.
[0063] The method of removing the auxiliary micro-components of the cabinet can be to identify the main frame part of the cabinet after removing the structural redundant features and retain it, and remove the bridge and other components that have no effect or very little effect on the force distribution between the cabinet and the misplaced container.
[0064] The advantage of this setting is that by simplifying the placement structure model, structures irrelevant to the static analysis can be filtered out, making the simulation model more concise and clear, which is conducive to the subsequent observation of the static analysis results.
[0065] On the basis of the above solution, optionally, when performing finite element modeling according to the simplified placement structure model, the specific steps of step S3 are:
[0066] S311, assigning corresponding equivalent densities in the placement structure model based on the actual weights of the container and the cabinet, and performing meshing on the placement structure model;
[0067] Equivalent density refers to a calculation method used to simplify the model during the finite element modeling process. It is an equivalent density value obtained by the ratio of the mass and volume of an object, which is used for subsequent analysis and calculation.
[0068] Meshing is the process of discretizing complex geometric models into a finite number of elements for numerical calculation and analysis.
[0069] The method of assigning equivalent density can be to obtain the actual weight of the container and cabinet through the relevant information of the container and cabinet input by the technician, calculate the ratio of the weight and volume of the container and cabinet respectively, obtain the corresponding equivalent density, and assign it to the corresponding container model and cabinet model respectively to simulate their respective mechanical properties.
[0070] The placement structure model can be meshed using solid elements. This involves discretizing the three-dimensional solid objects in the placement structure model. The continuous solid structure is divided into multiple small elements, which are interconnected through nodes to form an approximate solid model. Each element has a specific shape and size. Common solid element shapes include tetrahedrons and hexahedrons. These shapes can effectively fill three-dimensional space, simulate various complex solid structural shapes, and accurately describe the mechanical behavior of solid components such as containers and internal cabinets when subjected to stress, including stress, strain, and displacement.
[0071] Specifically: The specific implementation process of step S311 is:
[0072] Step S3111: Acquire the actual weight of the container and the actual weight of the cabinet. In this embodiment, the actual weight of the container is 5000 kg, and the actual weight of the cabinet is 1000 kg.
[0073] Step S3112: Calculate the volume of the container and cabinet using the geometric model. In this embodiment, the volume of the container is 10m 3 , the cabinet volume is 2m 3 .
[0074] Step S3113: Calculate the equivalent density of the container and the cabinet based on the equivalent density calculation formula. The equivalent density formula is: equivalent density = weight / volume; equivalent density of container = 5000kg / 10m 3 =500kg / m 3 ;Equivalent density of cabinet = 1000kg / 2m3 =500kg / m 3 .
[0075] Step S3114: assigning the calculated equivalent density of the container to the geometric body corresponding to the placement structure model;
[0076] Step S3115: Meshing is performed based on the placement structure model assigned with equivalent density.
[0077] Select the element type based on the geometric characteristics of the corresponding geometry, then set the global mesh size based on the overall size of the placed structure model, then perform local mesh control, and finally generate the mesh using the software tool. Local mesh control refers to refining the mesh in key areas of the geometry (connections, load application points).
[0078] S312. Obtain material parameters, connection methods, and ground installation methods of all containers and cabinets; wherein the connection methods include the connection methods between the relevant containers and the staggered containers and the connection methods between the cabinets and the staggered containers;
[0079] Material parameters include Young's modulus, Poisson's ratio, density, and yield strength of the materials used to make each container and cabinet. For example, a container is made of steel with an elastic modulus of 210 GPa and a Poisson's ratio of 0.3; a cabinet is made of aluminum alloy with an elastic modulus of 70 GPa and a Poisson's ratio of 0.33.
[0080] Specifically, in general, the relevant containers and the staggered containers are connected at common joints at welded locations, and the cabinets and the staggered containers are connected using bolted hinges. Other connection methods may be used in practical situations and are not specifically limited here. The connection method can affect the maximum interaction forces that can be withstood between containers and between containers and cabinets.
[0081] The ground-mounted mounting method for related containers can be the connection method between the bottommost container and the ground. For example, on soft ground, it may be necessary to add a foundation pad or use driven anchor bolts to improve the stability of the connection. On steel floors, magnetic or clamping connectors can be used to facilitate installation and removal while ensuring connection reliability. Different ground-mounted mounting methods have different numbers of restraint points and different distribution of restraint forces, which in turn affect the stability of the container.
[0082] S313. Setting the attribute parameters of each container and cabinet in the grid-divided placement structure model according to the material parameters and the connection method, and constraining the degrees of freedom of the relevant containers in the bottom layer according to the ground installation method to obtain a simulation model.
[0083] The property parameters can be set by analyzing the interaction forces between the staggered container and related containers, and between the staggered container and the cabinet based on the material parameters and the connection method, and adjusting the force conditions in the solid entity unit based on these interaction forces. In addition, corresponding texture structures can be set for the container model and the cabinet model based on the material parameters.
[0084] The method of performing 6-DOF constraints can be to analyze the constraint points and the distribution of the constraint forces on the bottom surface of the relevant containers in the lowest layer according to the ground installation method, and determine the motion range of the relevant containers in the lowest layer in three translational directions (movement along the x, y, and z axes) and three rotational directions (rotation around the x, y, and z axes) according to the positions of the constraint points and the distribution of the constraint forces.
[0085] The advantage of this setting is that it can take into account the influence of the weight of each structure such as containers and cabinets and the forces between each structure on the static analysis, making the simulation model more consistent with the actual construction situation and helping to improve the accuracy of the static analysis.
[0086] S4. Performing a static analysis on the simulation model, and obtaining the maximum structural stress of the misplaced containers and the maximum structural deflection of the bottommost container roof according to the analysis results;
[0087] The specific implementation process in this step is:
[0088] Step S41: discretize the simulation model into a finite number of units.
[0089] Step S42: applying a static load according to actual working conditions.
[0090] Step S43: Use software to solve the overall equilibrium equation to obtain the node displacement.
[0091] The overall equilibrium equation is:
[0092] KU=F
[0093] Where U is the nodal displacement vector and F is the nodal force vector.
[0094] The calculation formula of K is:
[0095]
[0096] Where: B is the strain-displacement matrix, Ω e is the unit domain.
[0097] Step S44: Calculate stress: Calculate the element stress of each element based on the node displacement, and determine the maximum stress value and its position;
[0098] Element stress:
[0099] σ e =CBU e
[0100] Among them, U e are the nodal displacements of the element.
[0101] Step S45: Determine the maximum deflection value and its position according to the node displacement; the maximum deflection is found by comparing the displacement values of all nodes and finding the maximum deflection value and its position.
[0102] Nodal displacement:
[0103] U=K -1 F
[0104] The maximum structural stress may be a stress value corresponding to a location within each structure in the simulation model that receives the maximum stress when the structure receives an external force.
[0105] The maximum deflection of a structure can be the maximum displacement of a point from its original position after a force is applied to the structure. For example, when a steel plate is first bent, the straight-line distance between the point of maximum bending and the position of that point before the deformation occurs is the same. Deflection is the displacement of a structure after a force is applied, and is usually directly derived from the displacement vectors of nodes.
[0106] The maximum stress and the maximum deflection of the structure can be obtained by performing a static analysis on the simulation model according to a pre-set simulation program, for example, Figure 3 Schematic diagram of the static analysis results of the container simulation model provided in Example 1 of the present application. Figure 3 As shown in the static analysis simulation results, the stress distribution of the containers and cabinets is marked with different colors. Based on the corresponding static force values and colors below, the maximum structural stress of 21.7 MPa is determined, located at the weld between the misaligned container and the bottom container. Based on this static analysis simulation result, deformation testing of the structure at the location of maximum stress was performed, and the maximum structural deflection was determined to be 0.077 mm, located at the bottom container roof.
[0107] S5. Match the maximum structural stress and the maximum structural deflection with a preset safety range, and perform a structural risk assessment on the misplaced container based on the matching result.
[0108] The preset safety range can be a numerical range of maximum structural stress and maximum structural deflection, determined in advance based on safety requirements, that ensures the container does not pose a structural risk. The numerical range of maximum structural stress can be determined based on the yield strength of the container steel plate.
[0109] The method for conducting a structural risk assessment on misplaced containers may be to compare the obtained maximum structural stress and maximum structural deflection with the corresponding numerical ranges in a preset safety range. When the maximum structural stress and the maximum structural deflection are both within the preset safety range, it is determined that there is no risk in the structure of the misplaced containers. If the maximum structural stress is not within the preset safety range, or the maximum structural deflection is not within the preset safety range, then there is a risk in the structure of the misplaced containers.
[0110] Based on the above solution, optionally, the specific steps of step S5 are:
[0111] S501, obtaining the yield strength of the steel plate from the material parameters, calculating the difference between the maximum stress of the structure and the yield strength of the steel plate, comparing the difference with a first required range in a preset safety range, and obtaining a comparison result;
[0112] The first requirement range can be the minimum difference between the maximum structural stress and the steel plate yield strength to ensure that misplaced containers and related containers will not cause structural risks such as rollover and collapse. Generally, the maximum structural stress is required to be much smaller than the steel plate yield strength.
[0113] S502: Calculate the ratio of the maximum deflection of the structure to the minimum span of the bottom container roof, compare the ratio with a second required range in the preset safety range, and obtain a comparison result;
[0114] The second requirement range can be the maximum ratio of the maximum structural deflection to the minimum span of the bottom container roof, which is used to ensure that misplaced containers and related containers do not face structural risks such as rollover and collapse. Generally, the deformation of large-span panels is required to not exceed 1 / 400 of the panel span.
[0115] S503: If the difference is within the first requirement range, and the ratio is within the second requirement range, then determine that the structure of the misplaced containers is risk-free.
[0116] The container's structural risk can be determined to be risk-free if the maximum structural stress is significantly less than the steel plate yield strength, and the ratio of the maximum structural deflection to the minimum span of the bottom container roof is less than 1 / 400. For example, if the maximum structural stress is 21.7 MPa, the maximum structural deflection is 0.077 mm, the container's steel plate yield strength is 235 MPa, and the minimum span of the bottom container roof is 3200 mm, then the maximum structural stress of 21.7 MPa is significantly less than the steel plate yield strength of 235 MPa. Furthermore, 0.077 / 3200 = 0.01 / 400, which is less than 1 / 400, thus confirming that the misplaced container is structurally risk-free.
[0117] The advantage of this setting is that it can determine whether there is a structural risk in the misplaced containers based on the maximum structural stress and the maximum structural deflection, which is conducive to providing a rigorous judgment standard for the assessment of structural risks and making the assessment results more accurate.
[0118] Based on the above solution, optionally, after step S5, the method further includes:
[0119] S6. Predicting the external force influencing factors of the container, and determining a recommended outward moving distance of the misplaced container based on the prediction result and the result of the structural risk assessment.
[0120] External force influencing factors may include the strength of welding between the misplaced container and related containers and external impact forces that the entire misplaced stacked container structure may be subjected to, such as wind force, earthquake, etc.
[0121] The recommended outward moving distance may be the maximum outward moving distance of the misplaced container that can ensure that there is no structural risk to the misplaced container while taking into account external force factors.
[0122] The recommended outward displacement distance can be determined by using big data to obtain the external force factors that may affect the container, as well as the impact values of the external force factors on the maximum structural stress and maximum structural deflection of the container. Based on the structural wind direction assessment, the maximum outward displacement distance of the staggered container relative to the relevant container that can correspond to the impact value under the external force factors is determined as the recommended outward displacement distance.
[0123] The advantage of this arrangement is that it can take into account the strength of container welding and the impact of external impact force on risk assessment, and thus ensure the structural stability of misaligned stacked containers in as many complex situations as possible to avoid safety accidents.
[0124] In this embodiment, a placement structure model is constructed based on the acquired structural information of the container, the cabinet information inside the container, and the predicted load-bearing personnel information, so that the placement structure model can accurately reflect the relative positions of each container in the misaligned stacked container and the distribution of the cabinets and personnel in the container; finite element modeling of the placement structure model can enable the simulation model to reflect the material properties, stress conditions, and constraints of each component in the misaligned stacked container, thereby making the static analysis in the simulation model closer to the actual use of the misaligned stacked container. Therefore, the structural risk assessment results obtained based on the static analysis results in the simulation model will be more in line with the actual situation. Compared with the manual stress analysis method in the related art, the present application can simulate the actual stress conditions of the misaligned stacked container by constructing a simulation model of the misaligned stacked container, so as to improve the accuracy of the static analysis results of the misaligned stacked container, thereby improving the accuracy of the structural risk assessment of the misaligned stacked container.
[0125] Example 2
[0126] A second embodiment of the present application provides a device for risk assessment of misaligned stacked containers, specifically comprising the following:
[0127] An information acquisition module is configured to acquire structural information of a container, information about cabinets within the container, and information about predicted passengers; wherein the container includes a staggered container and related containers in contact with the container; the cabinet information includes the location, shape, and material of each cabinet; and the predicted passenger information includes the number, weight, and location of passengers that the staggered container is expected to simultaneously carry.
[0128] A placement structure model building module, configured to build a placement structure model of the container based on the structure information, the cabinet information, and the predicted load-carrying personnel information;
[0129] a simulation model building module, configured to simplify the placement structure model and perform finite element modeling based on the simplified placement structure model to obtain a simulation model of the container;
[0130] A static analysis module, configured to perform a static analysis on the simulation model and obtain, based on the analysis results, the maximum structural stress of the misplaced containers and the maximum structural deflection of the bottommost container roof;
[0131] The structural risk assessment module is used to match the maximum structural stress and the maximum structural deflection with a preset safety range, and perform a structural risk assessment on the misplaced container based on the matching result.
[0132] In this embodiment, a placement structure model is constructed based on the structural information of the container obtained by the information acquisition module, the cabinet information inside the container, and the predicted load-bearing personnel information, so that the placement structure model can accurately reflect the relative positions of each container in the misaligned stacked container and the distribution of cabinets and personnel in the container; finite element modeling of the placement structure model by the simulation model construction module can enable the simulation model to reflect the material properties, stress conditions, and constraints of each component in the misaligned stacked container, thereby making the static analysis in the simulation model closer to the actual use of the misaligned stacked container. Therefore, the structural risk assessment results obtained based on the static analysis results in the simulation model will be more in line with the actual situation. Compared with the manual force analysis method in the related art, the present application can simulate the actual force conditions of the misaligned stacked container by constructing a simulation model of the misaligned stacked container, so as to improve the accuracy of the static analysis results of the misaligned stacked container, thereby improving the accuracy of the structural risk assessment of the misaligned stacked container.
[0133] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working process of the above-described device for risk assessment of staggered stacked containers can refer to the corresponding process in the aforementioned method embodiment and will not be repeated here.
[0134] The above are only preferred embodiments of the present application and the technical principles employed. The present application is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions that are possible for those skilled in the art will not depart from the scope of protection of the present application. Therefore, although the present application has been described in more detail through the above embodiments, the present application is not limited to the above embodiments and may include more other equivalent embodiments without departing from the concept of the present application. The scope of the present application is determined by the scope of the claims.
Claims
1. A method for risk assessment of misaligned stacked containers, characterized in that: include: S1. Obtaining structural information of a container, information about cabinets inside the container, and information about predicted passengers; wherein the container includes a staggered container and related containers in contact with it; the cabinet information includes the location, shape, and material of each cabinet; and the predicted passenger information includes the number, weight, and location of passengers expected to be simultaneously carried by the staggered container; S2. Constructing a placement structure model of the container based on the structure information, the cabinet information, and the predicted load-carrying personnel information; S3. Simplifying the placement structure model, and performing finite element modeling based on the simplified placement structure model to obtain a simulation model of the container; S4. Performing a static analysis on the simulation model, and obtaining the maximum structural stress of the misplaced containers and the maximum structural deflection of the bottommost container roof according to the analysis results; S5. Match the maximum structural stress and the maximum structural deflection with a preset safety range, and perform a structural risk assessment on the misplaced container based on the matching result.
2. The method for risk assessment of misaligned stacked containers according to claim 1, characterized in that: When simplifying the placement structure model, the specific steps of step S3 are: S301, identifying and removing structural redundant features in the placement structure model; S302: Remove the front and rear door panels of all containers and the attached micro-components of the cabinets located inside the misplaced container from the placement structure model.
3. The method for risk assessment of misaligned stacked containers according to claim 1, characterized in that: When finite element modeling is performed based on the simplified placement structure model, the specific steps of step S3 are: S311, assigning corresponding equivalent densities in the placement structure model based on the actual weights of the container and the cabinet, and performing meshing on the placement structure model; S312. Obtain material parameters, connection methods, and ground installation methods of all containers and cabinets; wherein the connection methods include the connection methods between the relevant containers and the staggered containers and the connection methods between the cabinets and the staggered containers; S313. Setting the attribute parameters of each container and cabinet in the grid-divided placement structure model according to the material parameters and the connection method, and constraining the degrees of freedom of the relevant containers in the bottom layer according to the ground installation method to obtain a simulation model.
4. The method for risk assessment of misaligned stacked containers according to claim 3, characterized in that: The specific steps of step S5 are: S501, obtaining the yield strength of the steel plate from the material parameters, calculating the difference between the maximum stress of the structure and the yield strength of the steel plate, comparing the difference with a first required range in a preset safety range, and obtaining a comparison result; S502: Calculate the ratio of the maximum deflection of the structure to the minimum span of the bottom container roof, compare the ratio with a second required range in the preset safety range, and obtain a comparison result; S503: If the difference is within the first requirement range, and the ratio is within the second requirement range, then determine that the structure of the misplaced containers is risk-free.
5. The method for risk assessment of misaligned stacked containers according to claim 1, characterized in that: After step S5, the method further includes: S6. Predicting the external force influencing factors of the container, and determining a recommended outward moving distance of the misplaced container based on the prediction result and the result of the structural risk assessment.
6. A device for risk assessment of misaligned stacked containers, characterized in that: include: An information acquisition module is configured to acquire structural information of a container, information about cabinets within the container, and information about predicted passengers; wherein the container includes a staggered container and related containers in contact with the container; the cabinet information includes the location, shape, and material of each cabinet; and the predicted passenger information includes the number, weight, and location of passengers that the staggered container is expected to simultaneously carry. A placement structure model building module, configured to build a placement structure model of the container based on the structure information, the cabinet information, and the predicted load-carrying personnel information; a simulation model building module, configured to simplify the placement structure model and perform finite element modeling based on the simplified placement structure model to obtain a simulation model of the container; A static analysis module, configured to perform a static analysis on the simulation model and obtain, based on the analysis results, the maximum structural stress of the misplaced containers and the maximum structural deflection of the bottommost container roof; The structural risk assessment module is used to match the maximum structural stress and the maximum structural deflection with a preset safety range, and perform a structural risk assessment on the misplaced container based on the matching result.