Abstract
The seismic vulnerability of highway continuous girder bridges is analyzed to provide theoretical basis for the study of multi-stage fortification and seismic design of such bridges. Based on the concept of performance seismic design, five performance levels of structures are determined, and the displacement ductility ratio of piers is taken as the performance quantitative index to calculate the damage limit values of bridges in different limit states. On this basis, IDA analysis method is used to calculate 20 subjects. Based on the reliability theory, logarithmic regression fitting analysis is carried out to obtain the seismic vulnerability curve. The theoretical vulnerability curve is indicated that the bridge has good comprehensive seismic performance. Under 0.3 g ground motion, the probability of minor damage, moderate damage and serious damage are 57.9%, 44.7% and 3.6% respectively. The comprehensive seismic performance of bridges and the probability of exceeding the damage status at all levels are reflected in the results, the guiding significance to analysis of the seismic performance of the entire traffic and the formulation of emergency rescue plans.
Highlights
Seismic vulnerability can usually be expressed by vulnerability curve [1]
Incremental dynamic analysis (IDA) is a parameter analysis method developed in recent years to evaluate the seismic performance of structures [2]
The seismic response of the structure is obtained by finite element model combined with incremental dynamic analysis method, and the vulnerability curve is formed based on the traditional reliability theory
Summary
Incremental dynamic analysis (IDA) is a parameter analysis method developed in recent years to evaluate the seismic performance of structures [2]. This method extends the single time history analysis to incremental time history analysis, which combines many advantages of static pushover analysis and non-linear time history analysis, so it is called "dynamic pushover analysis". It is called "dynamic pushover analysis" for multi-freedom structural systems and long-span bridge structures with high piers. The failure mode and damage probability of this kind of bridge are discussed, which provides a theoretical basis for evaluating the seismic performance of this kind of bridge and predicting and preventing the seismic disaster of the bridge
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