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Building framework structure damage detection method

A damage detection and frame structure technology, which is applied in the processing of the detected response signals and the use of sonic/ultrasonic/infrasonic waves to analyze solids, etc., which can solve the problems of low damage detection accuracy and slow iteration speed.

Inactive Publication Date: 2011-05-04
CHONGQING UNIV
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AI Technical Summary

Problems solved by technology

[0006] However, the above method still has the problem of slow iteration speed and low damage detection accuracy when solving large damage or multiple damage.

Method used

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  • Building framework structure damage detection method
  • Building framework structure damage detection method
  • Building framework structure damage detection method

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Experimental program
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Embodiment

[0041] figure 1 It is a schematic diagram of the two-story single-span space frame structure of the calculation example of the present invention. The numbers in the circles are unit numbers, and the rest are node numbers. The space three-dimensional frame element is selected, and the theoretical model of the frame structure is established according to the finite element theory of the bar system structure. The elastic modulus of the rod is 210GPa, the shear elastic modulus is 84GPa, and the cross-sectional area is 0.02m 2 , moment of inertia I Y =0.0001m 4 , I Z =0.0002m 4 , polar moment of inertia J=0.00005m 4 , the material density is 7800kg / m 3 . Figure 7 It is a schematic diagram of the realization of the computer program of the frame structure damage identification method of the present invention; Figure 8 It is the flow chart of subroutine 1; Figure 9 It is the flow chart of subroutine 2.

[0042] 1) Damage condition setting

[0043] In this example, two dam...

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Abstract

The invention discloses a building framework structure damage detection method. The method comprises the following steps of: firstly, testing a framework structure before being damaged to obtain a structural modal parameter (omega 0, phi 0); then, testing the damaged structure, and performing modal analysis to obtain a modal parameter (omega D, phi D); establishing a first-order modal parameter sensitivity equation S1D'=delta f and a second-order modal parameter sensitivity equation S1D'+S2D''=delta f; calculating first-order and second-order modal parameter sensitivities by adopting an improved modal truncation method; and solving a unit damage coefficient Di (i is 1, 2...n) by using a first-order and second-order sensitivity equation-based mixed iteration solving method so as to fulfill the purpose of simultaneously identifying the number, position and size of damages of the whole building structure. The method is suitable for damage detection of the building framework structure, saves the calculation workload, has high efficiency, and greatly improves the detection precision.

Description

technical field [0001] The invention belongs to the detection technology of a building frame structure, and in particular relates to a damage detection method of a building frame structure. Background technique [0002] As a fault diagnosis problem, building structure damage detection is a comprehensive technology with both basic theory and practical engineering background. Structural damage detection methods can be divided into local detection and overall detection from the perspective of the scope of detection. [0003] Local damage detection is the use of non-destructive testing technology to focus on the detection of special key components inside the structure, and it has been relatively maturely applied in civil engineering. The main existing detection methods are ultrasonic method, acoustic emission method, infrared method, shock wave method, radar method and microwave method. The local damage detection method is still limited to the level of structural components, i...

Claims

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Application Information

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IPC IPC(8): G01N29/12G01N29/44
Inventor 杨佑发赵忠华郜建人周兆静
Owner CHONGQING UNIV
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