Effects of near-field rotating seismic waves on seismic vulnerability of multi-span high-pier continuous rigid frame bridge

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (1) : 146-159.

ZHAO Jingang1, JIA Hongyu2, ZHAN Yulin2,3

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Abstract

In order to study the influence of near-fault rotational seismic waves on the fragility of multi-span high-pier continuous rigid frame bridge, a five-span high-pier continuous rigid frame bridge is taken as the research object. Firstly, based on the improved cloud chart method, 100 near-field translational seismic waves are selected from Pacific Earthquake Engineering Research Center ground motion database, and the rotational seismic waves are synthesized using the frequency domain method. And then, the random variables of bridge design parameters are selected, 100 sample points are extracted by the Latin hypercube method and randomly combined, and the OpenSees is used to establish 100 whole bridge finite element models to carry out dynamic nonlinear analysis under the action of near-field translational seismic waves and near-field translational + rotational seismic waves for obtaining the maximum curvature values of the key sections of high-piers. Finally, taking the critical values of the section curvature as the damage index, the seismic intensity index which suitable for fragility analysis under near-field translational + rotational seismic waves is studied, and the seismic fragility analysis is performed. The results show that the seismic intensity indexes PGD and Sdmax are most suitable for the fragility analysis of the multi-span high-pier continuous rigid frame bridge under the action of near-field translational + rotational seismic waves. The near-field rotational seismic waves significantly increase the damage probability of multi-span high-pier continuous rigid frame bridges. Therefore, ignoring the effects of rotational seismic wave would seriously underestimate the damage probability of multi-span high-pier continuous rigid frame bridges, and using the sectional curvature as the damage index can not well reflect the damage caused by the torsional component seismic waves. The research results of this paper are of great significance for a more comprehensive understanding of the seismic performance of multi-span high-pier continuous rigid frame bridge and improving the bridge seismic design and reinforcement theory.
Key words: multi-span high-pier continuous rigid frame bridge; rotational seismic wave; seismic fragility analysis; improved cloud chart method

Key words

multi-span high-pier continuous rigid frame bridge / rotational seismic wave / seismic fragility analysis / improved cloud chart method

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ZHAO Jingang1, JIA Hongyu2, ZHAN Yulin2,3. Effects of near-field rotating seismic waves on seismic vulnerability of multi-span high-pier continuous rigid frame bridge[J]. Journal of Vibration and Shock, 2023, 42(1): 146-159

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