Pounding effect of curved bridges subjected to near-fault seismic ground motions

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Journal of Vibration and Shock ›› 2018, Vol. 37 ›› Issue (21) : 52-60.

ZUO Ye , SUN Guangjun, Wang Zhipeng, LI Hongjing

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Abstract

Bridges’ seismic pounding leads to local damage of a structure, and even causes serious disarsters, such as, falling beam and collapsing.The irregularity of curved bridges makes their pounding effects be significantly different from those of straight beam bridges.A multi-scale finite element model of a typical 3-span curved bridge was established and poundings among its upper part’s main beams were simulated using the 3D contact-friction model combined with the explicit dynamic contact algorithm.The influences of pounding effects on the seismic response of the curved bridge under near-fault earthquake were analyzed.Meanwhile, a detailed parametric effect analysis was performed including ground motion parameters, pounding stiffness, expansion joint clearance and curvature radius, etc.parameters.The numerical results indicated that the seismic response of the curved bridge is significantly affected by inhomogeneous poundings and poundings restrict relative displacements of main beams; near-fault impulse earthquakes affects the pounding effect of the curved bridge more significantly than other two types earthquakes do; the maximum pounding force increases with increase in pounding stiffness and curvature radius, and decreases with increase in expansion joint clearance while main beams’ relative displacement response has the opposite changes; falling beam may occur at the curved beam outside due to excessive large outside tangential displacement.

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curved bridges / near-fault earthquakes / contact friction model / pounding effect / finite element model.

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ZUO Ye,SUN Guangjun, Wang Zhipeng, LI Hongjing . Pounding effect of curved bridges subjected to near-fault seismic ground motions[J]. Journal of Vibration and Shock, 2018, 37(21): 52-60

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