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Method for identifying damages of frame structure

A technology of damage identification and frame structure, which is applied in the direction of processing detection response signals, etc., can solve the problems of slow iterative convergence, low identification efficiency and accuracy, and large modal truncation error

Inactive Publication Date: 2011-05-04
CHONGQING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] However, the above method has the problems of large modal truncation error and slow iterative convergence, so the amount of data required for detection is large, and the recognition efficiency and accuracy are low

Method used

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  • Method for identifying damages of frame structure
  • Method for identifying damages of frame structure
  • Method for identifying damages of frame structure

Examples

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Embodiment

[0041] figure 1 It is a schematic diagram of a plane frame structure with five floors and two spans in the calculation example of the present invention. The numbers in the circles are unit numbers, and the rest are node numbers. Five-storey two-span reinforced concrete planar frame structure, the floor height of each floor is 4m, the total height of the structure is 20m, the frame column grid spacing is 6m, the cross-sectional size of the frame beam is 0.3m×0.5m, and the cross-sectional size of the central column is 0.5m×0.5m, the cross-sectional size of the side column is 0.5m×0.6m. The density of the material used is 2500kg / m 3 , the modulus of elasticity is 3×10 10 N / m 2 . The damage of the structure is manifested by the decrease of element stiffness, while the mass remains unchanged. Figure 9 It is a schematic diagram of the realization of the computer program of the frame structure damage identification method of the present invention; Figure 10 It is the flow cha...

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Abstract

The invention discloses a method for identifying damages of a frame structure. The method comprises the following steps: firstly, testing an undamaged frame structure, and carrying out model modification on an initial discretization model of the frame structure so as to obtain an accurate finite element theoretical model, and calculating a structural modal parameter (omega A0, phi A0); then, testing the damaged frame structure, and carrying out model analysis on the damaged frame structure so as to obtain a modal parameter (omega t2, phi t2); and finally, establishing a direct analysis method damage identification equation, and solving an unit damage coefficient Di (i=1, 2,..., n) by using front n (n is less than or equal to N) order frequencies and vibration mode variation value delta omega r (r=1, 2,..., n) of the frame structure before and after damage so as to achieve the purpose of simultaneously identifying the number, position and size of the damages existing in the whole structure. The method is suitable for the damage identification of a construction frame structure, and has the advantages of less required detection data amount, high efficiency and higher precision.

Description

technical field [0001] The invention belongs to the detection technology of a building frame structure, and in particular relates to a damage identification method of a building frame structure. Background technique: [0002] As far as the current situation is concerned, in the field of civil engineering in my country, due to human or natural factors, accidents continue to occur, causing major casualties and property losses, which has aroused widespread concern and great attention to the safety of major projects . As far as the historical situation is concerned, for the historical buildings that have been used in my country for decades or even hundreds of years, many of them are close to or even exceed the design reference period. In recent years, frequent natural disasters have also caused varying degrees of damage to historical buildings. , so how about their safety and reliability? This has also attracted more and more people's close attention. Therefore, it has become a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/44
Inventor 杨佑发梁文广徐典李帅
Owner CHONGQING UNIV
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