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Beam structure damage identification method based on support reaction force and inclination symmetric slope

A technology of bearing reaction force and damage identification, which is used in the testing of machine/structural components, elasticity testing, measuring devices, etc., to achieve accurate positioning, quantitative analysis, and accurate evaluation.

Active Publication Date: 2019-11-22
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The indicators of structural damage identification technology based on static parameters are mostly based on deflection, static strain, and support reaction force influence line indicators. With the advancement of inclination sensor technology, the change of structural inclination curve before and after damage is expected to be applied to Currently, there are few literature reports related to dip damage identification.

Method used

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  • Beam structure damage identification method based on support reaction force and inclination symmetric slope
  • Beam structure damage identification method based on support reaction force and inclination symmetric slope
  • Beam structure damage identification method based on support reaction force and inclination symmetric slope

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Experimental program
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Effect test

Embodiment 1

[0131] Such as Figure 16 As shown, the span of the simply supported beam is 100cm, and a unit is divided every 5cm, with a total of 20 units and 21 measuring points (the numbers in the upper row of circles in the figure are unit numbers, and the numbers in the lower row are measuring point numbers). The section size of the simply supported beam is b×h=4.5cm×1.5cm, and the material elastic modulus of the simply supported beam is 2.7×10 3 MPa, Poisson's ratio is 0.37, density is 1200kg / m 3 .

[0132] The damage in the actual engineering 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, it is assumed that the damage of the structural element only causes the decrease of the stiffness of the element, and does not cause the change of the mass of the element. Damage...

Embodiment 2

[0142] Such as Figure 21 As shown, the span of the cantilever beam is 100cm, and a unit is divided every 5cm, with a total of 20 units and 21 measuring points (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 measuring point numbers). The cross-sectional size of the cantilever beam is b×h=4.5cm×1.5cm, and the elastic modulus of the cantilever beam material is 2.7×10 3 MPa, Poisson's ratio is 0.37, density is 1200kg / m 3 .

[0143] The fixed support end unit 1, the mid-span unit 10 and the free end unit 20 of the cantilever beam have different degrees of damage, and the damage conditions are shown in Table 2.

[0144] Table 2 Multiple damage conditions of cantilever beam

[0145]

[0146] The specific implementation steps are as follows:

[0147] Step 1: Apply a concentrated load of 10N to the 21st measuring point at the cantilever end of the damaged cantilever beam to obtain the measured inclination...

Embodiment 3

[0154] Such as Figure 26 As shown, the span layout of the three-span continuous beam is 100+150+100cm, and a unit is divided every 10cm, with a total of 35 units and 36 measuring points (the numbers in the circles in the upper row in the figure are the unit numbers, and the numbers in the lower row are support number). The section size of the three-span continuous beam is b×h=4.5cm×1.5cm, and the elastic modulus of the material of the three-span continuous beam is 2.7×10 3 MPa, Poisson's ratio is 0.37, density is 1200kg / m 3 .

[0155] The unit 7 of the three-span continuous beam is located near the 0 point of the side span bending moment under the uniform load, the unit 13 is located near the 0 point of the bending moment under the concentrated load of the middle span, the unit 18 is the mid-span unit of the middle span, and the unit 26 is the largest third span The damage conditions of the negative bending moment unit are shown in Table 3.

[0156] Table 3 Damage conditi...

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Abstract

The invention discloses a beam structure damage identification method based on a support reaction force and an inclination symmetric slope. The method comprises a step of applying a load to a damagedbeam to obtain a measured inclination curve and support reaction force, a step of solving a symmetric slope of the measured inclination curve, a step of calculating a bending moment value at each position of the beam through the support reaction force and the load, a step of dividing the bending moment of a corresponding position by the inclination symmetric slope to obtain the stiffness of each position of the beam structure and identifying a damage position by an abrupt change in a stiffness curve after damage, a step of removing stiffness at the damage position and fitting a residual stiffness curve to obtain a stiffness curve before the damage, and a step of calculating a damage degree by stiffness curves after the damage and before the damage to obtain the stiffness of the beam structure at the damage position. According to the method, the damage to the beam structure can be accurately positioned and quantitatively analyzed, and the damage to the beam structure is accurately evaluated.

Description

technical field [0001] The invention belongs to the field of beam structure health monitoring, and relates to beam structure non-destructive testing technology, in particular to a beam structure damage identification method based on support reaction force and inclination symmetric slope. Background technique [0002] In recent years, there are more and more old bridges in our country, and the problems are becoming more and more obvious. Many existing bridges can no longer meet the functional requirements, and safety accidents such as bridge breakage and collapse occur from time to time. Scholars in the field of civil engineering have gradually realized the importance of health monitoring and safety assessment of bridge structures, and have studied various damage identification technologies. . Structural damage identification is an important part of the bridge structural health monitoring system. At present, there are two main types of damage identification methods: one is b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M99/00G01M5/00
CPCG01M5/0008G01M5/005G01M99/00G01M99/007
Inventor 唐盛华成鹏张学兵秦付倩杨文轩张佳奇刘宇翔
Owner XIANGTAN UNIV
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