Method for evaluating overall earthquake damage level of reinforced concrete frame structure based on equivalent single-degree-of-freedom system

Abstract

The invention relates to the technical field of earthquake damage evaluation, in particular to a method for evaluating the overall earthquake damage level of a reinforced concrete frame structure based on an equivalent single-degree-of-freedom system. The method is used for quickly and accurately evaluating the overall earthquake damage level of the structure after an earthquake by using strong ground motion data acquired by the structure. The method includes the steps that a multi-degree-of-freedom system structure is equivalent to the single-degree-of-freedom system structure, and namely the multi-degree-of-freedom system with N layers is equivalent to the single-degree-of-freedom system, wherein the mass M[e] of the single-degree-of-freedom system is equal to the total mass of the multi-degree-of-freedom system; the maximum acceleration response of the equivalent single-degree-of-freedom system under the same earthquake ground motion effect is worked out; the ductility coefficient of the equivalent single-degree-of-freedom system under the same earthquake ground motion effect is worked out; damage index calculation is carried out; structural damage evaluation is carried out. By means of the method, the defects that large errors can be caused in a damage evaluation method based on modal parameters and time and labor are consumed and results are prone to divergence in a damage evaluation method based on physical parameters are overcome, and the overall earthquake damage level of the structure can be easily, quickly and effectively evaluated in a quantitative mode.

Description

technical field [0001] The invention relates to a method for assessing the overall earthquake damage level of a reinforced concrete frame structure, and relates to the technical field of structural earthquake damage assessment. Background technique [0002] After a destructive earthquake, people often urgently need to know the damage and damage state of the structure, whether the structure can be repaired, and whether it can be used as a temporary residence. These issues are also particularly important for post-earthquake disaster relief and disaster assessment. Evaluation has also received more and more attention. In my country, with the implementation of new seismic codes, more and more buildings will be equipped with strong earthquake observation arrays. Once the structural arrays are recorded during an earthquake, technical and methodological support is needed to assess the structural damage state. [0003] Although there are many methods to assess the earthquake damage...

AI Technical Summary

Problems solved by technology

Relatively speaking, the first type of method is relatively simple, but due to the insensitivity of the modal parameters to damage, there are large errors in the evaluation results; the second type of method is more complicated, requiring the inversion of structural physical parameters and the need to ensure that the results are not accurate. Will diverge, or use numerical simulation analysis to determine the level of structural damage, which is time-consuming and labor-intensive

This obviously cannot meet the requirements for earthquake damage assessment and earthquake relief work with relatively high timeliness requirements.

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