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Uniform-section continuous beam damage identification method based on support influence line for reaction curvature difference

A support reaction force and damage identification technology, which is applied in the field of damage identification of continuous beams, can solve problems such as failure to provide

Active Publication Date: 2020-09-29
XIANGTAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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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 for bridges built earlier, while damage identification based on the difference in curvature of the support reaction force influence line The method can realize damage identification without pre-damage information. With the advancement of support reaction force sensor technology, the curvature difference of support reaction force influence line is expected to be applied to structural damage identification. At present, it is rare to see that no pre-damage information is required Literature reports related to the identification of bearing reaction force damage

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  • Uniform-section continuous beam damage identification method based on support influence line for reaction curvature difference
  • Uniform-section continuous beam damage identification method based on support influence line for reaction curvature difference
  • Uniform-section continuous beam damage identification method based on support influence line for reaction curvature difference

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Embodiment 1

[0138] Embodiment one: see Figure 9 , the span layout of the two-span continuous beam is 50+50cm, 5cm divides a unit, 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 .

[0139] 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 two-span continuous beam as an example, considering that the 5 units in the midd...

Embodiment 2

[0151] Embodiment two: see Figure 12 , the span layout of the three-span continuous beam is 50+75+50cm, 5cm divides a unit, and 36 nodes (the numbers in the upper circle in the figure are the unit numbers, and the lower numbers 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 . Considering that multiple damages of different degrees occur at the same time, the damage conditions are shown in Table 2.

[0152] Table 2 Multiple damage conditions of cantilever beam

[0153]

[0154] The specific implementation steps are as follows:

[0155] Step 1: Set measuring points at the positions of supports 1#, 2#, 3# and 4#, apply a 1kN moving load to the three-span continuous beam, and obtain the support reaction force influence line measured on the beam support.

[0156] Step 2: Calculate the curvature difference of the support reaction force influence line of each suppo...

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Abstract

The invention discloses a uniform-section continuous beam damage identification method based on support influence line for reaction curvature difference. The method comprises the steps of setting a support reaction measurement point at each support of a continuous beam, and obtaining a support influence line for reaction of each support of the continuous beam through applying a moving load; solving the curvature of the support influence line for reaction, further performing difference, and performing damage positioning through sudden change of a curvature difference curve of the support influence line for reaction; and further carrying out damage degree quantification through the difference change of the curvature of support influence line for reaction of the continuous beam. According tothe method, information of the continuous beam before damage is not needed, only the measurement points need to be arranged at the support, the requirement for the number of the measurement points islow, the number of measurement sensors is reduced, damage of the uniform-section continuous beam can be accurately positioned and quantified, and the method is applied to damage evaluation of the uniform-section continuous beam.

Description

technical field [0001] The invention relates to the technical field of damage detection of constant-section continuous beam structures, in particular to a damage identification method for constant-section continuous beams based on the curvature difference of support reaction force 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, w...

Claims

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Application Information

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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