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Damage identification method for constant-section beam structures based on curvature difference of displacement influence lines

A displacement influence line, structural damage technology, applied in the testing of machine/structural components, elasticity testing, instruments, etc., can solve problems such as inability to provide

Active Publication Date: 2021-12-28
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Most of the research methods of structural damage identification technology based on static parameters use information before damage, which may not be able to provide information before damage to bridges built earlier, while damage identification methods based on curvature differences of displacement influence lines do not require The information before damage can realize damage identification. With the advancement of displacement sensor technology, the curvature difference of displacement influence line is expected to be applied to structural damage identification. At present, there are few literatures related to displacement damage identification that do not require pre-damage information. to report

Method used

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  • Damage identification method for constant-section beam structures based on curvature difference of displacement influence lines
  • Damage identification method for constant-section beam structures based on curvature difference of displacement influence lines
  • Damage identification method for constant-section beam structures based on curvature difference of displacement influence lines

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Embodiment 1

[0123] Embodiment one: see Figure 9 , the span of the simply supported beam is 100cm, and a unit is divided by 5cm, a total of 20 units and 21 nodes (the numbers in the circles in the upper row in the figure are the unit numbers, and the numbers in the lower row are the node numbers). The cross-sectional size of the plate is b×h=6cm×3cm, and the elastic modulus of the material is 2.7×10 3 MPa, the density is 1200kg / m 3 .

[0124] The damage in the actual bridge structure, such as the generation of cracks, material corrosion or the reduction of elastic modulus, generally only causes a large change in the structural stiffness, but has little impact on the quality of the structure. Therefore, in the finite element calculation, the damage of the element is simulated by reducing the elastic modulus. The beam structure model is established by finite element software. Taking the damage condition of a single unit of a simply supported beam as an example, consider that the side un...

Embodiment 2

[0136] Embodiment two: see Figure 12 , the span layout of the three-span continuous beam is 60+90+60cm, and 5cm is divided into one unit, a total of 42 units and 43 nodes (the numbers in the circles in the upper row in the figure are unit numbers, and the numbers in the lower row are node numbers). The cross-sectional size of the plate is b×h=6cm×3cm, and the elastic modulus of the material is 2.7×10 3 MPa, the density is 1200kg / m 3 . Considering that multiple damages of different degrees occur at the same time, the damage conditions are shown in Table 2.

[0137] Table 2 Multi-damage conditions of three-span continuous beams

[0138]

[0139] The specific implementation steps are as follows:

[0140] Step 1: Set measuring points at nodes 7, 22, and 37, apply a 1kN moving load to the three-span continuous beam, and obtain the displacement influence lines measured at the measuring points.

[0141] Step 2: Calculate the curvature difference of the displacement influence...

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Abstract

The invention discloses a damage identification method for equal-section beam structures based on the curvature difference of displacement influence lines. The curvature of the displacement influence line is calculated and further differentiated, and the damage location is carried out through the sudden change of the curvature difference curve of the displacement influence line; the damage degree is further quantified by the curvature difference change of the displacement influence line of the measuring point on the beam structure; For information before damage, only some measuring points need to be set on the beam structure, which requires less number of measuring points, saves the amount of monitoring sensors, and can accurately locate and quantify the damage of equal-section beam structures. Damage assessment.

Description

technical field [0001] The invention relates to the technical field of damage detection of constant-section beam structures, in particular to a damage identification method for constant-section beam structures based on curvature differences of displacement influence lines. Background technique [0002] With the rapid development of our country's economy, the number of bridges in our country is also increasing rapidly. Bridges are not only related to transportation, but also closely related to the economic development of society and the safety of people's lives. During the service period of the bridge, it is inevitable that part of the bridge structure will be damaged due to the load and the environment. Therefore, it is necessary to detect the state and performance of the bridge to judge the health of the bridge. At present, the main methods of damage identification can be divided into two categories, one is the method based on dynamic parameters, which uses the changes of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M5/00G06F30/13G06F119/14
CPCG01M5/0008G01M5/0033G06F30/13G06F2119/14
Inventor 唐盛华张佳奇秦付倩成鹏刘宇翔杨文轩
Owner XIANGTAN UNIV