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Damage identification method for beam structures based on horizontal support reaction force influence lines

A support reaction force and damage identification technology, which is applied in the testing of machines/structural components, instruments, measuring devices, etc.

Active Publication Date: 2022-02-22
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there are few literature reports on the use of horizontal support reaction force to realize damage identification.

Method used

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  • Damage identification method for beam structures based on horizontal support reaction force influence lines
  • Damage identification method for beam structures based on horizontal support reaction force influence lines
  • Damage identification method for beam structures based on horizontal support reaction force influence lines

Examples

Experimental program
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Effect test

Embodiment 1

[0086] Embodiment one: see Figure 4 , the span of the single-span beam is 50cm, 5cm divides a unit, a total of 10 units, 11 nodes, the number in the circle on the beam in the figure represents the unit number, the number under the beam is the node number, 1# and 2# represent two a stand. The cross-sectional dimension of the beam is b×h=6cm×3cm, and the elastic modulus of the material is 2.7×10 3 MPa, the density is 1200kg / m 3 .

[0087] In the actual bridge damage, the main manifestations are the corrosion and corrosion of steel bars and concrete materials and the appearance of cracks, which leads to the decrease of the elastic modulus of the bridge, but the cross-sectional area and weight of the bridge do not change much. Therefore, in the finite element software simulation, the damage part adopts the simulation method of reducing the elastic modulus. The beam structure model is established by finite element software. Taking single-span beam and multi-unit damage condit...

Embodiment 2

[0094] Embodiment two: see Figure 9 , the span of the two-span variable cross-section beam is 60+60cm, and a unit is divided by 5cm. There are 24 units and 25 nodes in total. The numbers in the circles on the beams in the figure represent the unit numbers, and the numbers below the beams are the node numbers, 1#, 2 # and 3# represent three supports respectively. The cross-sectional dimension of the beam end and the support is b×h=6cm×4cm, the cross-sectional dimension of the beam span is b×h=6cm×2cm, the beam height in the span changes according to the second parabola, and the elastic modulus of the material 2.7×10 3 MPa, the density is 1200kg / m 3 .

[0095] In the actual long-span bridges, most of the bridges are variable-section beams, so it is necessary to test whether the method can be applied to variable-section beam structures. The beam structure model is established by finite element software. Taking the multi-unit damage condition of variable cross-section beam a...

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Abstract

The invention discloses a beam structure damage identification method based on the reaction force influence line of the horizontal support. The steps are as follows: set horizontal supports at both ends of the beam measurement span to constrain the horizontal displacement of the measurement span; set the horizontal support at the beam structure horizontal support Measure points and apply moving loads in the horizontal direction before and after the damage, and obtain the influence line of the horizontal support reaction force before and after the damage of the beam structure; make a difference between the influence lines of the horizontal support reaction force at the measurement points before and after the damage, and then calculate the quotient through the horizontal The mutation of the differential quotient curve of the influence line of the support reaction force is used to locate the damage; further, the damage degree is quantified through the change of the differential quotient of the influence line of the horizontal support reaction force at the measuring point; The number of measuring points is small, which saves the cost of monitoring sensors, can accurately locate and quantify the damage of beam structures, and is applied to the damage assessment of beam structures.

Description

technical field [0001] The invention relates to the technical field of beam structure damage detection, in particular to a beam structure damage identification method based on horizontal support reaction force influence lines. Background technique [0002] In recent years, my country's society has continued to develop and progress, and the national economy has also rapidly improved. And infrastructure construction and national economic development complement each other, such as bridge construction occupies a certain position in it. At present, the number of bridges in my country ranks first in the world and is still increasing rapidly. During the service period of the bridge, it is inevitable that part of the bridge structure will be damaged by the load and the environment, and the safety of the bridge is not only related to traffic, but also closely related to social development and people's lives, so it is necessary to monitor the health of the bridge. At present, the co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M99/00
CPCG01M99/007
Inventor 唐盛华张佳奇秦付倩成鹏刘宇翔杨文轩
Owner XIANGTAN UNIV