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Bridge damage detection method based on strain influence line curvature of elastic constraint beam

An elastic constraint, damage detection technology, applied in geometric CAD, design optimization/simulation, sustainable transportation, etc., can solve problems such as difficulty in diagnosing bridge damage, damage, and initial parameters of supports affecting damage diagnosis results.

Active Publication Date: 2020-03-27
ANHUI UNIVERSITY OF ARCHITECTURE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] It is still worth noting that the support design models all use ideal hinge supports, and the elastic deformation of supports and piers is not considered in the actual damage identification, and the actual support cannot rotate infinitely like the ideal hinge. The uncertainty of the initial parameters also affects the damage diagnosis results
Therefore, the uncertainty of the initial parameters of the structure brings certain difficulties to the bridge damage diagnosis: whether the identified damage result is the real damage of the bridge structure, or the misjudgment caused by the above-mentioned unclear initial parameters, this is the key to accurate bridge diagnosis. Actual damage presents certain challenges

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  • Bridge damage detection method based on strain influence line curvature of elastic constraint beam
  • Bridge damage detection method based on strain influence line curvature of elastic constraint beam
  • Bridge damage detection method based on strain influence line curvature of elastic constraint beam

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Embodiment 1

[0039] A bridge damage detection method based on the curvature of the strain-influenced line of an elastically constrained beam, the method comprising the following steps:

[0040] Step 1: In order to solve the non-ideal constraint status of the actual simply supported girder bridge support, simplify the analysis of the boundary conditions of the girder bridge, based on the Euler-Bernoulli beam assumption, establish the elastic constrained beam model under the constraints of vertical elastic springs and horizontal double springs, It is used to simulate the actual boundary constraints of girder bridges, such as simply supported girder bridges under the vertical elastic deformation of buttresses and non-ideal rotational constraints, or a span of continuous girder bridges, or elastic expansion and contraction of suspenders and cables. The main girders of hanger arch bridges, cable-stayed bridges and suspension bridges that are constrained to rotate by the main girder of the adjace...

Embodiment 2

[0088] Considering the solid web section of the arch section of a rigid frame arch bridge as an elastically constrained beam, a finite element model of the rigid frame arch section is established, and the cross-sectional dimensions of the model are shown in Figure 4 As shown, the concrete strength grade is C30. In order to introduce the initial uncertainty parameters of the section bending resistance, according to the lognormal and standard normal probability distribution models, the coefficient of variation δ of the elastic modulus of the material and the moment of inertia of the section is introduced E and δ I , the bending stiffness uncertainty parameter Λ(x) of unit 1-80 is given by δ E and δ I Multiplied together, the following table shows the model's initial bending uncertainty parameter description:

[0089]

[0090]

[0091] In the verification process of the calculation example, the local damage is simulated by reducing the elastic modulus of the element, the...

Embodiment 3

[0103] In order to further verify the damage identification effect of SILC in high-order statically indeterminate structures, a three-span continuous steel truss tie-bar arch bridge model was established; the whole bridge adopts a single-layer deck, the main truss The bridge is a continuous steel truss structure of 102m+180m+102m. The finite element model adopts Q235 steel with strength grade and elastic modulus of 210GPa. The model has 1287 kinds of sections, 2561 elements and 907 nodes. The typical section dimensions and models are shown below Figure 11 .

[0104] In order to prove the effect of SILC on the damage identification of different components, three damage cases are introduced into the model for the common damage of steel truss arch bridges in actual engineering. The damage location and degree are shown in Figure 12 , A is the measuring point, B is working condition 1 and the suspender is damaged by 40%, C is working condition 2 and the beam node is 40% damaged,...

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Abstract

The invention discloses a bridge damage detection method based on the strain influence line curvature of an elastic constraint beam. The method comprises the steps of model establishment and analysis,strain influence line analysis and damage identification establishment. According to the invention, boundary conditions with rotation constraint and elastic support are adopted to establish a beam type substructure model with uncertain flexural rigidity and local damage; the analytic expression of the strain influence line of any cross section is deduced; furthermore, the bridge structure damageidentification method based on the difference curvature of the strain influence lines before and after damage is provided, analysis solution proving and numerical example verification prove that the SILC can be used for statically indeterminate bridge damage diagnosis, and theoretical support is provided for application of the SIL method in structure damage diagnosis.

Description

technical field [0001] The invention belongs to the field of bridge damage detection, in particular to a bridge damage detection method based on the curvature of the strain-influenced line of an elastically restrained beam. Background technique [0002] In recent years, structural health monitoring has been preliminarily implemented in large-scale bridge projects. As the main task of structural health monitoring, damage diagnosis is inseparable from accurate identification methods and reliable data sensing systems. According to the different forms of structural response, damage identification methods can be divided into static index and dynamic index, but the former faces the disadvantage of high testing cost, while the latter has the characteristics of low test sensitivity. At present, the influence line indicators have gradually attracted the attention of scholars at home and abroad because of their advantages of overall loading and single-point output global response. Suc...

Claims

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Application Information

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IPC IPC(8): G06F30/20G06F30/13G06F111/10
CPCY02T90/00
Inventor 周宇刘金澳吴侃黄浩万杨旭李宁
Owner ANHUI UNIVERSITY OF ARCHITECTURE
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