Two-step building framework structure damage detecting method

Abstract

The invention provides a two-step building framework structure damage detecting method. The two-step building framework structure damage detecting method includes the two steps that firstly, the locations of damaged units in a building framework structure are determined primarily according to the rate of changes of the element modal strain energy before and after the building framework structure is damaged; secondly, the damage coefficients, primarily determined in the first step, of the damaged units in the building framework structure serve as an unknown quantity of a direct analytical method analytical method equation of the building framework structure, and the damage degrees and locations of the damaged units in the building framework structure are determined finally through solutions. The method makes full use of the advantage that the locations of the damaged units can be effectively recognized only through the low-order mode of the index of the rate of changes of the element modal strain energy; meanwhile, the number of unknown quantities for iterative solution and the iterations of the direct analytical method analytical method equation are reduced, the needed number of mode orders is greatly reduced, and therefore the damage detection and recognition efficiency is improved, and the damage detection and recognition accuracy is high.

Description

technical field [0001] The invention relates to a detection technology for a building frame structure, in particular to a two-stage damage detection method for a building frame structure. Background technique [0002] In the field of civil engineering in our country, due to man-made or natural factors, accidents occur frequently, causing heavy 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 beyond the design reference period. In recent years, frequent natural disasters have also caused varying degrees of damage to existing building structures. damage, what about their safety and reliability? This has also attracted more and more people's close attention. Therefore, it has become an inevitable requirement to monitor and ...

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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 h

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