Fragility analysis of long span continuous rigid frame bridge under multi-support excitations

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Journal of Vibration and Shock ›› 2013, Vol. 32 ›› Issue (5) : 75-80.

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Fragility analysis of long span continuous rigid frame bridge under multi-support excitations

LI Ji-tao1，YANG Qing-shan1，LIU Yang-bing2

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Abstract

Due to wave passage effect, incoherence effect, local effect and other factors in seismic ground motion, the internal force and deformation of long span continuous rigid framed bridges will be error-estimated when seismic responses analysis is performed under identical support ground motion excitations. A Monte Carlo simulation method is used to establish the random sample (large-span continuous rigid frame bridge and ground motion), by means of considering the uncertainties of the structural material and ground motion, both for identical support ground motion excitations and multiple support ground motion excitations. The ductility ratio of piers is defined as the damage state of the bridge. And the seismic fragility analysis is carried out for two different excitation method and the fragility curves of the bridge are given base on the damage state definition. The peak acceleration relationship of different excitation methods is obtained under the same level damage.

Key words

Ground motion / multiple support excitations / uncertainly / fragility curve / regressive analysis

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LI Ji-tao;YANG Qing-shan;LIU Yang-bing. Fragility analysis of long span continuous rigid frame bridge under multi-support excitations[J]. Journal of Vibration and Shock, 2013, 32(5): 75-80