SEISMIC ANALYSIS OF UNEQUAL HEIGHT PIER BRIDGE CONSIDERING SOIL-PILE INTERACTION

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Journal of Vibration and Shock ›› 2016, Vol. 35 ›› Issue (23) : 114-120.

LV Yang 1, LIU Zhe 1, LI Zhong-xian 1,2

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Abstract

Based on the secondary development of LS-DYNA program, the nonlinear dynamic p-y model and the Bonora damage material model of steel were applied into the main program. Taking a four-span approach bridge as an example, the plastic damage model of the upper bridge and four simplified bridge pile-foundation models, including Beam on Winkler Foundation model, effective length pile model, total pile model considering soil-structure interaction and no pile model were introduced. The earthquake motions obtained by free-field analysis were applied to the different depth of pile profile. The free vibration characteristics, displacement, acceleration, internal force and damage under different levels of earthquake motions were analyzed. The stress-strain curve of different depth of p-y elements and pile deflection of Winkler-methods model were discussed. Analysis results indicated that the structure responses are different among the four pile-foundation models, the responses of the bridge in longitudinal and transverse directions are totally different, and the p-y model can be used to simulate the bridge precisely.

Key words

soil-structure interaction / Beam on Winkler Foundation model / damage / unequal height pier bridge / p-y model

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LV Yang 1, LIU Zhe 1, LI Zhong-xian 1,2. SEISMIC ANALYSIS OF UNEQUAL HEIGHT PIER BRIDGE CONSIDERING SOIL-PILE INTERACTION[J]. Journal of Vibration and Shock, 2016, 35(23): 114-120

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