Bridge seismic analyzing method based on seismic risk assessment

Abstract

The invention relates to a b ridge seismic analyzing method based on seismic risk assessment, a spectral acceleration Sa in a ground motion intensity index is mainly adopted, Pup (Imi) is guided to be a seismic damage probability when the intensity of a bridge structure is IM, [delta][lambda] H,i a is seismic risk contribution parameter under seismic fortification levels, the Pup (Imi) and the [delta][lambda] H,I are utilized to calculate a seismic risk value [lambda] UP of a bridge structure, and anti-seismic property of the bridge structure is assessed. According to the invention, seismic risk values of dangerous components of the bridge are solved through the method provided by the invention, according to structural risk assessment relevant regulation, the anti-seismic properties of components of the bridge are researched, comparative study can be performed on seismic risk values of the components under different bridge seismic mitigation and isolation measures, and feasibility and applicability of different bridge seismic mitigation and isolation measures are assessed.

Description

technical field [0001] The invention relates to the field of anti-seismic analysis of bridge structures, in particular to a method for anti-seismic analysis of bridges based on earthquake risk assessment. Background technique [0002] my country is one of the countries with the strongest seismic activity in the world. Earthquake disasters have always been one of the largest natural disasters in my country. In recent decades, many destructive earthquakes have occurred around the world, causing very serious loss of life and property, especially It is a bridge as a key point of the highway and railway transportation network system, an important hub structure in the traffic lifeline system, and an infrastructure that is relatively easy to damage under the action of an earthquake. The bridge structure was severely damaged in the earthquake, cutting off the traffic lifeline in the earthquake area , causing great difficulties in disaster relief work, aggravating secondary disasters, ...

AI Technical Summary

Problems solved by technology

[0002] my country is one of the countries with the strongest seismic activity in the world. Earthquake disasters have always been one of the largest natural disasters in my country. In recent decades, many destructive earthquakes have occurred around the world, causing very serious loss of life and property, especially It is a bridge as a key point of the highway and railway transportation network system, an important hub structure in the traffic lifeline system, and an infrastructure that is relatively easy to damage under the action of an earthquake. The bridge structure was severely damaged in the earthquake, cutting off the traffic lifeline in the earthquake area , causing great difficulties in disaster relief work, aggravating secondary disasters, and resulting in very large losses

[0003] Earthquake risk analysis is to use the analysis results of earthquake risk, combined with the accumulated knowledge of the affected objects and related society, to quantitatively analyze the degree of earthquake disaster that may be suffered by specific areas and structures. The integral solution of the dangerous curve of the engineering site is obtained, but the specific expressions of these two curves are often very complicated, and there are often many problems in the direct integral solution. In order to apply the earthquake risk assessment to the analysis of the seismic performance of bridges, a new analysis is urgently needed method

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