Damage identification method for constant cross-section continuous beams based on the curvature difference of support reaction forces

A technology for bearing reaction force and damage identification, which can be used in elastic testing, testing of machine/structural components, instruments, etc., and can solve problems such as inability to provide

Active Publication Date: 2022-01-28
XIANGTAN UNIV
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  • Claims
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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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  • Damage identification method for constant cross-section continuous beams based on the curvature difference of support reaction forces
  • Damage identification method for constant cross-section continuous beams based on the curvature difference of support reaction forces
  • Damage identification method for constant cross-section continuous beams based on the curvature difference of support reaction forces

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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 method for identifying damage of constant-section continuous beams based on the difference in curvature of support reaction force influence lines. The support reaction force influence line of each support; the curvature of the support reaction force influence line is calculated and further differentiated, and the damage location is performed through the sudden change of the curvature difference curve of the support reaction force influence line; further, the continuous beam support reaction force influence The degree of damage was quantified by differential changes in line curvature. The invention does not need the information before the continuous beam is not damaged, but only needs to set the measuring points at the support, which requires less measuring points, saves the amount of monitoring sensors, and can accurately locate and quantify the damage of the continuous beam with equal cross-section. Damage assessment of continuous beams of constant cross-section.

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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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
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