Abstract
For evaluating seismic performance of structures, a method is presented based on increment dynamic analysis and seismic fragility analysis. Firstly, the failure probability equation is deduced, in which the relationships of seismic intensities and response demands can be determined by the increment dynamic analysis. On this basis the probabilities with different damage levels under different seismic intensities are obtained. Secondly, damage parameter R is defined and used to reflect seismic damage level of structures, damage index Re is defined and used to compare with R range and determine the situation of seismic damage. Finally, the procedure is proposed for evaluating structural seismic performance. In order to verify and demonstrate the method, three structural models are designed, and typical earthquake records are selected. The results of example analysis show that this method is convenient for evaluating multi-levels seismic performance of structures.
Highlights
Seismic fragility analysis is the core research module of PBEE a new-generation methodology based on total probability theory[1]
A seismic performance evaluation method is proposed in this paper based on increment dynamic analysis (IDA) and seismic fragility analysis, in which a concept of damage index is presented, and is adopted to evaluate the seismic performance of structures
A method for evaluating seismic performance of structures is proposed based on seismic fragility analysis, as follows
Summary
Seismic fragility analysis is the core research module of PBEE a new-generation methodology based on total probability theory[1] It refers to the probability of structural failure or of reaching a certain performance level under the action of ground motions of different intensities. Expressing the result as a probability is not accepted by engineers, as engineers prefer to use a single value to evaluate the structural damage rather than the failure probability of using multiple failure states, which hinders its application in engineering For this reason, a seismic performance evaluation method is proposed in this paper based on increment dynamic analysis (IDA) and seismic fragility analysis, in which a concept of damage index is presented, and is adopted to evaluate the seismic performance of structures
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