The applicability of rocking pilegroup foundations in the design of urban viaducts was focused. Based on a typical twospan elevated bridge on the Jiamin road in Shanghai, two finite element models with rocking and conventional pilegroup foundations were developed respectively using the OpenSees platform, considering the nonlinear soilpile interaction. The seismic responses of the two types of foundations were analyzed with various pier height and excitation intensity, and then the applicability of the rocking pilegroup foundations for urban viaducts was evaluated by taking the critical pile seismic forces, the longitudinal reinforcement, and the maximum and residual displacements at the pile top as the evaluation indices. The results show that the loading state of unexpected large tensile force combined with larger bending moment can be prevented by using the rocking pile foundation and consequently the longitudinal reinforcement ratio is significantly reduced. The seismic safety of the rocking pilegroup foundation is primarily governed by the maximum vertical load bearing capacity of the piles. Though the rocking pilegroup foundation leads to relatively larger maximum horizontal displacements at the pile top, smaller residual displacements resulted by the rocking pilegroup foundation indicates a better resilient performance. Both the two types of pile foundations lead to similar maximum and residual vertical displacements.
仲浩然,管仲国. 提离式桩基础用于城市高架桥抗震之适用性分析[J]. 振动与冲击, 2018, 37(10): 117-122.
ZHONG Haoran, GUAN Zhongguo. Applicability of rocking pile group foundations in the seismic design of urban viaducts#br#. JOURNAL OF VIBRATION AND SHOCK, 2018, 37(10): 117-122.
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