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Bridge static force finite element model correcting method based on super-element combination virtual deformation method

A model correction and finite element technology, which is applied in the field of finite element model correction, can solve the problems such as the inability to meet the correction of large and complex bridges with finite element models and the low efficiency of finite element model correction, so as to improve efficiency, ensure calculation accuracy, and improve calculation efficiency. Effect

Active Publication Date: 2014-10-08
HARBIN INST OF TECH
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  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the correction efficiency of the finite element model of the existing bridge structure is low and cannot satisfy the problem of the correction of the finite element model of the large complex bridge, and provides a bridge static finite element model correction method based on the superelement combined with the virtual deformation method

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  • Bridge static force finite element model correcting method based on super-element combination virtual deformation method
  • Bridge static force finite element model correcting method based on super-element combination virtual deformation method
  • Bridge static force finite element model correcting method based on super-element combination virtual deformation method

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specific Embodiment approach 1

[0022] Specific implementation mode 1: the following combination figure 1 To explain this embodiment, the method for correcting the bridge static finite element model based on the superelement combined with the virtual deformation method described in this embodiment is as follows:

[0023] Step 1: Use super-element technology to shrink the initial finite element model of the bridge structure to obtain the finite element model of the bridge structure after condensation;

[0024] Step 2: Build a proxy model of the bridge structure finite element model according to the finite element condensation model of the bridge structure obtained in step 1, combined with the virtual deformation method;

[0025] Step 3: According to the proxy model of the bridge structure finite element model obtained in Step 2, the bridge structure finite element model revision based on static information is carried out.

[0026] In this embodiment, the virtual deformation method is a fast structural reanalysis metho...

specific Embodiment approach 2

[0027] Specific implementation manner 2: the following combination figure 1 This embodiment will be described. This embodiment will further explain the first embodiment. The specific process of obtaining the finite element model of the bridge structure after condensation in step one is:

[0028] Step 1: Suppose the bridge structure contains n degrees of freedom, and its characteristic equation is expressed as:

[0029]

[0030] Where λ i with Respectively represent the eigenvalue and eigenvector of the bridge structure, where i=1, 2, 3...n; K and M respectively represent the stiffness matrix and the mass matrix;

[0031] Step one and two, let x represent the displacement and eigenvector at the same time, and divide the displacement vector into the direction of the main degrees of freedom x m And from the degree of freedom direction x s , Where m and s represent the master degree of freedom and the slave degree of freedom respectively, and the stiffness matrix is ​​divided into four s...

specific Embodiment approach 3

[0043] Specific implementation manner three: the following combination figure 1 To explain this embodiment, this embodiment further explains the first embodiment. The specific process of establishing the proxy model of the bridge structure finite element model in step 2 is:

[0044] Step 2: Analyze the eigenvalues ​​of the stiffness matrix of the spatial beam element to obtain the six deformation forms of the spatial beam element. In the local coordinate system, the relationship between the strain transformation matrix of the element, the displacement of the element node and the generalized strain of the element is :

[0045] ϵ = Gu = - 1 L 0 0 0 0 0 1 L 0 0 0 0 0 0 0 6 L 2 0 - 3 L 0 0 0 - 6 L 2 0 - 3 L 0 0 - 6 L 2 0 0 0 - 3 L 0 6 L 2 0 0 0 - 3 L 0 ...

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Abstract

The invention relates to a finite element correcting method for an actual operation bridge structure of static force information, in particular to a bridge static force finite element model correcting method based on a super-element combination virtual deformation method to solve the problems that the correcting efficiency of a finite element model of an existing bridge structure is low, and the requirement for correcting a large and complex bridge finite element model cannot be met. The correcting method specifically comprises the steps that shrinking is carried out on an initial finite element model of the bridge structure through the super-element technology, and the shrunk bridge structure finite element model is obtained; an agent model of the bridge structure finite element model is established through the combination with the virtual deformation method; the bridge structure finite element model based on the static force information is corrected. The method is used for correcting the actual operation bridge structure finite element model based on static force information.

Description

Technical field [0001] The invention relates to a method for correcting a finite element model of an actual operating bridge structure based on static information. Background technique [0002] The bridge structure is an important hub connecting highways, and the safety of its structure plays an important role in ensuring the safety and smooth flow of highway traffic. Effective and accurate assessment of the bearing capacity of a bridge structure is an important means to ensure the safety of bridge operations, and the assessment of the bearing capacity of a bridge often relies on an accurate benchmark finite element model that can reflect the actual operating conditions of the bridge, and the bridge finite element based on static test information Model modification is an effective method to establish the benchmark model. [0003] The finite element model correction method of bridge structure based on static information has the following advantages: the model correction result is n...

Claims

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Application Information

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IPC IPC(8): G06F17/50
Inventor 刘洋马俊聂珏光张绍逸杨昌熙
Owner HARBIN INST OF TECH
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