A method and system for optimizing the load-transmitting structure of a cable-stayed bridge

Abstract

The present invention provides an optimization method and system for a load-transfer structure of a cable-stayed bridge, wherein the method comprises: analyzing a finite element model pre-constructed according to the design parameters of the cable-stayed bridge to determine a load-transfer optimization data set; taking the load-transfer optimization data set as a reference, retrieving a corresponding load-transfer optimization parameter set from a pre-configured optimization library; parsing the load-transfer optimization parameter set to determine an optimization result. The present invention implements an optimization method for the load-transfer structure of a cable-stayed bridge, ensuring that after the cable-stayed bridge is put into use, the dead load of the main beam and the load of the vehicle are transferred to the cable tower, and then transferred to the foundation through the cable tower, thereby ensuring the performance of the cable-stayed bridge after construction.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge construction, and in particular to an optimization method and system for a load-transmitting structure of a cable-stayed bridge. Background Art

[0002] A cable-stayed bridge, also known as a cable-stayed bridge, is a bridge in which the main beam is directly pulled on the bridge tower by many cables. It is a structural system composed of a pressure-bearing tower, a tensioned cable and a bending beam. It can be regarded as a multi-span elastically supported continuous beam with cables replacing piers. It can reduce the bending moment in the beam body, lower the building height, reduce the structural weight and save materials. A cable-stayed bridge is mainly composed of a cable tower, a main beam and a cable.

[0003] The cable-stayed bridge structure is a highly hyperstatic structure in mechanics and is the most complex structure among all bridge types. The load-transmitting structure of a cable-stayed bridge refers to the connecting components between the ends of the cable and the main beam, as well as the connecting components between the middle and the cable tower. Its structure is extremely important for a cable-stayed bridge, and how to optimize it is of great significance. Summary of the invention

[0004] One of the purposes of the present invention is to provide a method and system for optimizing the load-transfer structure of a cable-stayed bridge, so as to achieve the optimization of the load-transfer structure of the cable-stayed bridge and ensure that after the cable-stayed bridge is put into use, the dead load of the main beam and the load of the vehicle are transferred to the cable tower, and then transferred to the foundation through the cable tower, so as to ensure the performance of the cable-stayed bridge after construction.

[0005] An optimization method for a load-transmitting structure of a cable-stayed bridge provided by an embodiment of the present invention comprises:

[0006] Analyze the finite element model pre-built based on the design parameters of the cable-stayed bridge to determine the load-transfer optimization data set;

[0007] Based on the load optimization data set, the corresponding load optimization parameter set is retrieved from the pre-configured optimization library;

[0008] Analyze and transfer the optimization parameter set to determine the optimization results.

[0009] Preferably, the steps of constructing the finite element model are as follows:

[0010] Generate a 3D model of the cable-stayed bridge based on the design data;

[0011] Perform finite element segmentation on the three-dimensional model, obtain finite element units and configure the parameters of the finite element units.

[0012] Preferably, the steps for determining the transmission optimization data set are as follows:

[0013] Locate the finite element units corresponding to the load-transmitting structure as target units and determine the load-transmitting paths between the target units;

[0014] The target units are sorted according to the load transfer path, and the associated finite element units corresponding to each target unit are determined as associated units from the finite element model, and the load transfer relationship between the associated units and the target units is determined;

[0015] Based on the transmission relationship between the associated unit and the target unit, the parameters corresponding to the associated unit are extracted;

[0016] Based on the transmission relationship between each target unit, the parameters corresponding to the target unit are extracted;

[0017] The extracted parameters of the associated unit and the parameters of the target unit are arranged in order to form a load-carrying optimization data set.

[0018] Preferably, the transmission optimization parameter sets in the optimization library are associated with the transmission optimization data sets in a one-to-one correspondence.

[0019] Preferably, the parsing steps of the load optimization parameter set are as follows:

[0020] Extract the structural type parameters of the entity corresponding to each finite element unit, and determine the structural type from a preset type library;

[0021] The attribute parameters of the entity corresponding to each finite element unit are extracted, and the attribute parameters are determined from the attribute library corresponding to the preset structure type.

[0022] The present invention also provides an optimization system for the load transfer structure of a cable-stayed bridge, comprising: an analysis module, a retrieval module and an analytical module; wherein the analysis module analyzes a finite element model constructed in advance based on the design parameters of the cable-stayed bridge to determine a load transfer optimization data set; the retrieval module uses the load transfer optimization data set as a reference to retrieve a corresponding load transfer optimization parameter set from a pre-configured optimization library; the analytical module analyzes the load transfer optimization parameter set to determine the optimization result.

[0023] Preferably, the steps of constructing the finite element model are as follows:

[0024] Generate a 3D model of the cable-stayed bridge based on the design data;

[0025] Perform finite element segmentation on the three-dimensional model, obtain finite element units and configure the parameters of the finite element units.

[0026] Preferably, the analysis module determines the steps of determining the transmission optimization data set as follows:

[0027] Locate the finite element units corresponding to the load-transmitting structure as target units and determine the load-transmitting paths between the target units;

[0028] The target units are sorted according to the load transfer path, and the associated finite element units corresponding to each target unit are determined as associated units from the finite element model, and the load transfer relationship between the associated units and the target units is determined;

[0029] Based on the transmission relationship between the associated unit and the target unit, the parameters corresponding to the associated unit are extracted;

[0030] Based on the transmission relationship between each target unit, the parameters corresponding to the target unit are extracted;

[0031] The extracted parameters of the associated unit and the parameters of the target unit are arranged in order to form a load-carrying optimization data set.

[0032] Preferably, the transmission optimization parameter sets in the optimization library are associated with the transmission optimization data sets in a one-to-one correspondence.

[0033] Preferably, the parsing steps of the parsing module for parsing the load optimization parameter set are as follows:

[0034] Extract the structural type parameters of the entity corresponding to each finite element unit, and determine the structural type from a preset type library;

[0035] The attribute parameters of the entity corresponding to each finite element unit are extracted, and the attribute parameters are determined from the attribute library corresponding to the preset structure type.

[0036] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the written description and the accompanying drawings.

[0037] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0039] Figure 1 A schematic diagram of an optimization method for a load-transmitting structure of a cable-stayed bridge according to an embodiment of the present invention;

[0040] Figure 2 It is a schematic diagram of an optimization system for a load-transmitting structure of a cable-stayed bridge according to an embodiment of the present invention. DETAILED DESCRIPTION

[0041] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0042] The embodiment of the present invention provides a method for optimizing the load-carrying structure of a cable-stayed bridge. Figure 1 As shown, including:

[0043] Step 1: Analyze the finite element model pre-built based on the design parameters of the cable-stayed bridge to determine the load transfer optimization data set;

[0044] By constructing a finite element model, the stress of a cable-stayed bridge can be analyzed in a modified manner; the steps for constructing a finite element model are as follows: based on the design data, generate a three-dimensional model corresponding to the cable-stayed bridge; perform finite element segmentation on the three-dimensional model to obtain finite element units and configure the parameters of the finite element units. Specifically: extract the parameter data of each component of the cable-stayed bridge in the design data and construct the three-dimensional models of the corresponding components respectively, and then splice the three-dimensional models of each component to generate the three-dimensional model corresponding to the cable-stayed bridge; the finite element segmentation of the three-dimensional model of the cable-stayed bridge can be understood as the finite element segmentation of the three-dimensional model of each component, using different finite element segmentation methods according to the type of component, and using the type number corresponding to the component to retrieve the corresponding segmentation method from the pre-configured finite element unit segmentation method library for segmentation; thereby obtaining at least one finite element unit corresponding to each component; the parameters of the finite element unit include: the size parameters, weight parameters, tensile parameters, anti-extrusion parameters, etc. of the segmentation area corresponding to the three-dimensional model corresponding to the finite element unit;

[0045] The steps for determining the load-transfer optimization data set are as follows: locate the finite element unit corresponding to the load-transfer structure as the target unit and determine the load-transfer path between the target units; sort the target units according to the load-transfer path, and determine the associated finite element units corresponding to each target unit as the associated unit from the finite element model, and determine the load-transfer relationship between the associated unit and the target unit; extract the parameters corresponding to the associated unit based on the load-transfer relationship between the associated unit and the target unit; extract the parameters corresponding to the target unit based on the load-transfer relationship between each target unit; arrange the extracted parameters of the associated unit and the parameters of the target unit in order to form a load-transfer optimization data set. Assumptions: The finite element units corresponding to the positioning load-transmitting structure are the finite element units of the components connected to the main beam at both ends of the inclined cable, the inclined cable, and the components connected to the cable tower in the middle of the inclined cable; there are two load-transmitting paths, which are the components connected to the cable tower at both ends, and the target units are arranged in two columns side by side through the load-transmitting paths; the associated units corresponding to the components connected to the main beam at both ends of the inclined cable are the finite element units of the area corresponding to the main beam. The load-transmitting relationship between the main beam and the inclined cable through the connecting components at both ends is the conversion of weight into tension, and the corresponding extracted parameters are weight parameters, contact surface type, and contact surface size; the associated unit configuration corresponding to the inclined cable body is None. The load-transfer relationship between the main body of the cable and the connection structures at both ends is tension, and the extracted parameters of the corresponding target unit are tensile parameters. The associated unit corresponding to the component connected to the tower in the middle of the cable is the finite element unit located below the connection position on the tower. The load-transfer relationship between the main body of the cable and the component connected to the tower through the tower is the conversion of tension into downward pressure. The extracted parameters are anti-extrusion parameters, contact surface type and contact surface size. The extracted parameters are arranged according to the established order between the parameters and the order of the load-transfer paths of the finite element units, and filled with preset filling values ​​to form a load-transfer optimization data set.

[0046] Step 2: Based on the transmission optimization data set, a corresponding transmission optimization parameter set is retrieved from a pre-configured optimization library;

[0047] The optimization library is analyzed and constructed in advance by professionals, and the load optimization parameter set and the load optimization data set are associated one-to-one in the optimization library.

[0048] Step 3: Analyze the optimized parameter set and determine the optimization result.

[0049] The analysis steps of the load optimization parameter set are as follows: extract the structural type parameters of the entities corresponding to each finite element unit, and determine the structural type from the preset type library; extract the attribute class parameters of the entities corresponding to each finite element unit, and determine the attribute parameters from the attribute library corresponding to the preset structural type. The structural types that need to be determined are generally the components connected to the main beam at both ends of the inclined cable and the components connected to the cable tower in the middle of the inclined cable. The structural types corresponding to the various structural type parameters are distributed in the type library; the attribute parameters include: length, width, height, length of each side and other dimensions, and one or more combinations of materials.

[0050] In one embodiment, the method for optimizing the load-transmitting structure of a cable-stayed bridge further includes:

[0051] Analyze construction monitoring data during construction and update the finite element model;

[0052] Reconstruct the optimization data set, retrieve the optimization parameter set from the optimization library, and re-optimize;

[0053] The updating steps of the finite element model are as follows: parse the construction monitoring data to determine the inspection data of the cable-stayed bridge that has been constructed; adjust the parameters of the finite element unit based on the inspection data. During the construction of the cable-stayed bridge, the construction progress is monitored by real-time monitoring means to form construction monitoring data. By analyzing the construction monitoring data, the inspection data of the cable-stayed bridge that has been constructed is extracted, and then the parameters of the finite element unit are updated and adjusted on this basis. The inspection data includes: the size parameters and material density parameters of the constructed part of the cable-stayed bridge, and the updated and adjusted parameters include: size parameters and weight parameters, parameters corresponding to the constructed cable force configuration, etc.

[0054] Since the update is performed during the construction process, if the update frequency is too fast, it is easy to cause serious waste of computing power. In one embodiment, the optimization method of the cable-stayed bridge load-carrying structure further includes:

[0055] Before re-analysis or updating of the finite element model, the construction monitoring data is analyzed to determine whether it meets the pre-configured trigger nodes. If it does, it is updated; the trigger nodes are configured by professionals, for example: the corresponding construction stage when each inclined cable configuration is completed;

[0056] However, since the trigger node is configured at the completion stage of the important components, when the construction difference is too large during the construction process, timely optimization cannot be performed. Therefore, a difference threshold is configured to implement monitoring of the difference between the actual construction and the design solution. When the difference exceeds the difference threshold, it triggers update and re-analysis to achieve timely optimization. The difference value is calculated based on the difference of each constructed parameter after construction, and the difference value table corresponding to each parameter is queried to determine the difference value corresponding to each parameter; the sum of the difference values ​​corresponding to each parameter is used as the difference between the actual construction and the design solution; the difference threshold is configured in advance; and a correction value is also configured, which is the same as the difference threshold. When the optimization is triggered by a difference threshold, an additional correction value needs to be subtracted in the next difference value calculation.

[0057] In order to make the configuration of the difference threshold more reasonable, a threshold adjustment value can also be configured. The threshold adjustment value is obtained by analyzing the same or similar cable-stayed bridge projects. The specific analysis steps are as follows:

[0058] Integrate the projects to be analyzed into analysis groups;

[0059] An analysis parameter set is constructed based on the differences between various parameters of the completed cable-stayed bridge of the project in the analysis group and various parameters of the cable-stayed bridge in the design data;

[0060] Based on the analysis parameter set, the corresponding associated analysis coefficient value is retrieved from the preset analysis library;

[0061] Calculate the average value of the analysis coefficient corresponding to each project in the analysis group as a reference value;

[0062] The threshold adjustment value is determined by querying a pre-configured threshold adjustment value determination table through a reference value;

[0063] The analysis library is pre-configured, and the analysis parameter set is associated with the analysis coefficient value in a one-to-one correspondence; the threshold adjustment value is used to adjust the difference threshold to make the trigger judgment more reasonable and effective. The judgment of similar or identical projects is to calculate the similarity between the identification parameter sets of the finite element models corresponding to the projects. When the similarity is greater than the preset similarity threshold, the two are judged to be similar or identical projects. The identification parameters are a set of feature parameters for feature extraction of the finite element model. The extracted feature parameters include: the total number of finite elements, the type of finite elements, the proportion of each type of finite elements, etc.

[0064] The present invention also provides an optimization system for the load-carrying structure of a cable-stayed bridge, such as Figure 2As shown, it includes: an analysis module 1, a retrieval module 2 and an analysis module 3; wherein the analysis module 1 analyzes the finite element model pre-constructed according to the design parameters of the cable-stayed bridge to determine the load transfer optimization data set; the retrieval module 2 takes the load transfer optimization data set as a benchmark and retrieves the corresponding load transfer optimization parameter set from a pre-configured optimization library; the analysis module 3 analyzes the load transfer optimization parameter set to determine the optimization result.

[0065] The steps for constructing the finite element model are as follows:

[0066] Generate a 3D model of the cable-stayed bridge based on the design data;

[0067] Perform finite element segmentation on the three-dimensional model, obtain finite element units and configure the parameters of the finite element units.

[0068] The steps for determining the optimized data set by the analysis module 1 are as follows:

[0069] Locate the finite element units corresponding to the load-transmitting structure as target units and determine the load-transmitting paths between the target units;

[0070] The target units are sorted according to the load transfer path, and the associated finite element units corresponding to each target unit are determined as associated units from the finite element model, and the load transfer relationship between the associated units and the target units is determined;

[0071] Based on the transmission relationship between the associated unit and the target unit, the parameters corresponding to the associated unit are extracted;

[0072] Based on the transmission relationship between each target unit, the parameters corresponding to the target unit are extracted;

[0073] The extracted parameters of the associated unit and the parameters of the target unit are arranged in order to form a load-carrying optimization data set.

[0074] Among them, the transmission optimization parameter set in the optimization library is associated with the transmission optimization data set in a one-to-one correspondence.

[0075] The parsing steps of the parsing module for parsing the optimized parameter set are as follows:

[0076] Extract the structural type parameters of the entity corresponding to each finite element unit, and determine the structural type from a preset type library;

[0077] The attribute parameters of the entity corresponding to each finite element unit are extracted, and the attribute parameters are determined from the attribute library corresponding to the preset structure type.

[0078] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A method for optimizing the load-transmitting structure of a cable-stayed bridge, characterized in that: include: Analyze the finite element model pre-built based on the design parameters of the cable-stayed bridge to determine the load-transfer optimization data set; Based on the load optimization data set, the corresponding load optimization parameter set is retrieved from the pre-configured optimization library; Analyze and transfer the optimization parameter set to determine the optimization result; The steps for constructing the finite element model are as follows: Generate a 3D model of the cable-stayed bridge based on the design data; Perform finite element segmentation on the three-dimensional model, obtain finite element units and configure the parameters of the finite element units; The steps for determining the optimized data set are as follows: Locate the finite element units corresponding to the load-transmitting structure as target units and determine the load-transmitting paths between the target units; The target units are sorted according to the load transfer path, and the associated finite element units corresponding to each target unit are determined as associated units from the finite element model, and the load transfer relationship between the associated units and the target units is determined; Based on the transmission relationship between the associated unit and the target unit, the parameters corresponding to the associated unit are extracted; Based on the transmission relationship between each target unit, the parameters corresponding to the target unit are extracted; The extracted parameters of the associated unit and the parameters of the target unit are arranged in order to form a load-carrying optimization data set.

2. The method for optimizing the load-transmitting structure of a cable-stayed bridge according to claim 1, characterized in that: The load optimization parameter set in the optimization library is associated with the load optimization data set in a one-to-one correspondence.

3. The method for optimizing the load-transmitting structure of a cable-stayed bridge according to claim 1, characterized in that: The parsing steps of the load optimization parameter set are as follows: Extract the structural type parameters of the entity corresponding to each finite element unit, and determine the structural type from a preset type library; The attribute parameters of the entity corresponding to each finite element unit are extracted, and the attribute parameters are determined from the attribute library corresponding to the preset structure type.

4. An optimization system for a load-transmitting structure of a cable-stayed bridge, characterized in that: include: Analysis module, retrieval module and analytical module; wherein the analysis module analyzes the finite element model pre-constructed according to the design parameters of the cable-stayed bridge to determine the load transfer optimization data set; the retrieval module uses the load transfer optimization data set as a benchmark to retrieve the corresponding load transfer optimization parameter set from the pre-configured optimization library; the analytical module analyzes the load transfer optimization parameter set to determine the optimization result; The steps for constructing the finite element model are as follows: Generate a 3D model of the cable-stayed bridge based on the design data; Perform finite element segmentation on the three-dimensional model, obtain finite element units and configure the parameters of the finite element units; The analysis module determines the steps of determining the transmission optimization data set as follows: Locate the finite element units corresponding to the load-transmitting structure as target units and determine the load-transmitting paths between the target units; The target units are sorted according to the load transfer path, and the associated finite element units corresponding to each target unit are determined as associated units from the finite element model, and the load transfer relationship between the associated units and the target units is determined; Based on the transmission relationship between the associated unit and the target unit, the parameters corresponding to the associated unit are extracted; Based on the transmission relationship between each target unit, the parameters corresponding to the target unit are extracted; The extracted parameters of the associated unit and the parameters of the target unit are arranged in order to form a load-carrying optimization data set.

5. The optimization system for the load-transmitting structure of a cable-stayed bridge according to claim 4, characterized in that: The load optimization parameter set in the optimization library is associated with the load optimization data set in a one-to-one correspondence.

6. The optimization system for the load-transmitting structure of a cable-stayed bridge according to claim 4, characterized in that: The parsing steps of the parsing module for parsing the optimized parameter set are as follows: Extract the structural type parameters of the entity corresponding to each finite element unit, and determine the structural type from a preset type library; The attribute parameters of the entity corresponding to each finite element unit are extracted, and the attribute parameters are determined from the attribute library corresponding to the preset structure type.

Images