A two-stage damage detection method for building frame structures

Abstract

The invention provides a two-stage building frame structure damage detection method, which is completed in two stages: stage 1, using the unit modal strain energy change rate of the building frame structure before and after damage to preliminarily determine the damage in the building frame structure The position of the unit; stage 2. The damage coefficient of each damage unit initially determined in stage 1 of the building frame structure is used as the unknown quantity in the damage identification equation of the direct analytical method to establish the building frame structure, and finally determine each damage in the building frame structure by solving The extent and location of damage to the unit. This method makes full use of the advantage that the element modal strain energy change rate index can effectively identify the position of the damaged element only by the low-order mode, and also reduces the number of unknowns and iterations for the iterative solution of the damage identification equation of the direct analytical method. The modal order is greatly reduced, which improves the efficiency of damage detection and recognition, and has a high accuracy of damage detection and recognition.

Description

technical field [0001] The invention relates to a building frame structure detection technology, in particular to a two-stage building frame structure damage detection method. Background technique [0002] In the field of civil engineering in my country, due to man-made or natural factors, accidents continue to occur, resulting in heavy casualties and property losses. As far as the historical situation is concerned, for the historical buildings that have been used for decades or even hundreds of years in our country, there are many buildings that have approached or even exceeded the design reference period. damage, how about their safety and reliability? This is also attracting more and more attention. Therefore, it has become an inevitable requirement to monitor and diagnose the structural performance of existing buildings, to detect structural damage in time, to predict possible disasters, and to evaluate their safety. [0003] As a fault diagnosis problem, building str...

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Problems solved by technology

[0008] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a two-stage building frame structure damage detection method, which has high detection efficiency and high recognition accuracy, and is used to solve the problem of building frame damage in the prior art. Structural damage requires a large number of modal orders, low identification efficiency, and low identification accuracy

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