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Correction method of bridge static finite element model based on superelement combined with 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 of low finite element model correction efficiency and inability to meet the needs of large and complex bridge finite element model correction, so as to improve efficiency, ensure calculation accuracy, and improve calculation efficiency Effect

Active Publication Date: 2017-03-01
HARBIN INST OF TECH
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  • Claims
  • 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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  • Correction method of bridge static finite element model based on superelement combined with virtual deformation method
  • Correction method of bridge static finite element model based on superelement combined with virtual deformation method
  • Correction method of bridge static finite element model based on superelement combined with virtual deformation method

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specific Embodiment approach 1

[0022] Specific implementation mode one: the following combination figure 1 Describe this embodiment, the bridge static finite element model correction method based on superelement combined with virtual deformation method described in this embodiment, the specific process of this method is:

[0023] Step 1: Use superelement technology to polycondense the initial finite element model of the bridge structure to obtain the condensed finite element model of the bridge structure;

[0024] Step 2: According to the finite element polycondensation model of the bridge structure obtained in step 1, a proxy model of the finite element model of the bridge structure is established in combination with the virtual deformation method;

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

[0026] In this embodiment, the virtual deforma...

specific Embodiment approach 2

[0027] Specific implementation mode two: the following combination figure 1 Describe this embodiment, this embodiment will further explain Embodiment 1, the specific process of obtaining the condensed bridge structure finite element model described in step 1 is:

[0028] Step 11, assume that the bridge structure contains n degrees of freedom, and its characteristic equation is expressed as:

[0029]

[0030] In the formula, λ i and represent the eigenvalues ​​and eigenvectors of the bridge structure respectively, where i=1,2,3...n; K and M represent the stiffness matrix and mass matrix respectively;

[0031] Step 1 and 2, let x denote the displacement and eigenvector at the same time, and divide the displacement vector into the main degree of freedom direction x m and from the degree of freedom direction x s , where m and s represent the master degrees of freedom and slave degrees of freedom respectively, and the stiffness matrix is ​​divided into four sub-matrices K a...

specific Embodiment approach 3

[0043] Specific implementation mode three: the following combination figure 1 Describe the present embodiment, this embodiment will further explain the embodiment 1, the specific process of establishing the proxy model of the bridge structure finite element model described in step 2 is:

[0044] Step 21: Perform eigenvalue analysis on the stiffness matrix of the space beam unit to obtain six deformation forms of the space beam unit. In the local coordinate system, the relationship between the strain transformation matrix of the unit, the displacement of the unit nodes and the generalized strain of the unit is :

[0045]

[0046] In the formula: ε represents the generalized strain vector of the element, in the form of ε=[ξ,χ xz ,χ xy ,κ xz ,γ,κ xy ] T ;

[0047] ξ represents the generalized strain under the axial deformation form of the element along the x direction;

[0048] x xz Represents the generalized strain of the unit in the deformation form of the coupling o...

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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 a bridge structure in actual operation 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 smoothness of highway traffic. Effectively and accurately assessing the bearing capacity of bridge structures is an important means to ensure the safety of bridge operations, and the assessment of bridge bearing capacity often relies on an accurate benchmark finite element model that can reflect the actual operating conditions of the bridge, and the bridge finite element model based on static test information Model revision is an effective way to establish this baseline model. [0003] The finite element model correction method of bridge structure based on static information has the following advantages: the model correction results are no...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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