摘要This study aims to determine the pounding probability of a continuous rigid bridge with high piers and long span at the actual site soil under the action of an earthquake. Finite element models of the bridge are built to analyze separation length. The effect of the actual site soil on seismic wave propagation from the bedrock to the pier and the abutment foundation is considered using DEEPSOIL software. A pounding probability analysis method under multi-support seismic excitations with bedrock peak acceleration as the strength index is proposed. The pounding probability of the continuous rigid bridge with high piers and long span under multi-support seismic excitations is analyzed using the proposed method. Meanwhile, a comparison analysis of the pounding probability results under uniform excitations without considering the influence of the actual site soil is performed. The study indicates that the required width of the expansion joint under uniform excitation is larger than the multi-support excitation with the increase in bedrock peak acceleration. With the increase in the width of expansion joint and the acceleration peak, the probability of pounding at a single abutment and at two abutments under multi-support excitation is gradually less than uniform excitation. Therefore, the actual site soil must be considered when determining the width of the expansion joint of a continuous rigid bridge with high piers and long span.
Abstract：This study aims to determine the pounding probability of a continuous rigid bridge with high piers and long span at the actual site soil under the action of an earthquake. Finite element models of the bridge are built to analyze separation length. The effect of the actual site soil on seismic wave propagation from the bedrock to the pier and the abutment foundation is considered using DEEPSOIL software. A pounding probability analysis method under multi-support seismic excitations with bedrock peak acceleration as the strength index is proposed. The pounding probability of the continuous rigid bridge with high piers and long span under multi-support seismic excitations is analyzed using the proposed method. Meanwhile, a comparison analysis of the pounding probability results under uniform excitations without considering the influence of the actual site soil is performed. The study indicates that the required width of the expansion joint under uniform excitation is larger than the multi-support excitation with the increase in bedrock peak acceleration. With the increase in the width of expansion joint and the acceleration peak, the probability of pounding at a single abutment and at two abutments under multi-support excitation is gradually less than uniform excitation. Therefore, the actual site soil must be considered when determining the width of the expansion joint of a continuous rigid bridge with high piers and long span.
基金资助:Supported by the National Natural Science Foundation of China (No.51308465), Postdoctoral Science Foundation of China (No.2015M580031), the Science and Technology Plan of Sichuan Science and Technology Department (No.2019YJ0243)
岳伟勤, 贾宏宇, 赵灿晖, 蓝先林, 刘浩然. Influence of Actual Site Soil Layers on Pounding of a High-pier Bridge Occurred between Deck and Abutment[J]. Journal of Highway and Transportation Research and Development, 2020, 14(1): 55-64.
YUE Wei-qin, JIA Hong-yu, ZHAO Can-Hui, LAN Xian-lin, LIU Hao-Ran. Influence of Actual Site Soil Layers on Pounding of a High-pier Bridge Occurred between Deck and Abutment. Journal of Highway and Transportation Research and Development, 2020, 14(1): 55-64.
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2020, Vol. 14 
