Effects of seabed ground motion on vulnerability of offshore bridges

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Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (17) : 131-136.

WANG Debin1, LI Xin1, SUN Zhiguo2, WANG Dongsheng3, CHEN Baokui4

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Abstract

Here, to study seismic performance of bridges under offshore ground motion, taking the approach segment of a certain offshore bridge as an example, its finite element analysis model based on ABAQUS was established.Based on the 1-D wave theory and hydrodynamic equation, the spectral representation method was used to simulate offshore ground motion.The vulnerability of the bridge was analyzed by using the probabilistic seismic demand analysis (PSDA) method, and transcendental probability curves of bridge piers under offshore and onshore ground motions, respectively were drawn and analyzed contrastively.The results showed that compared with onshore ground motion, offshore ground motion can significantly increase the damage probability of piers, and the maximum increase amplitude reaches 23.44%; compared with onshore ground motion, the bridge vulnerable pier column changes under offshore ground motion; the seismic performance study of offshore bridges based on onshore ground motion can underestimate damage of piers and mis-estimate bridge’s vulnerable parts to cause inaccurate calculation results.

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bridge engineering / continuous beam bridge / vulnerability curve / offshore ground motion / numerical simulation

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WANG Debin, LI Xin, SUN Zhiguo, WANG Dongsheng, CHEN Baokui. Effects of seabed ground motion on vulnerability of offshore bridges[J]. Journal of Vibration and Shock, 2021, 40(17): 131-136

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