整体箱板式高桩码头地震响应数值模拟分析

Numerical simulation analysis of seismic response of integral box-slab high-pile wharf

针对整体箱板式高桩码头的地震响应,利用ABAQUS软件创建有限元与无限元耦合的弹塑性损伤模型。通过非线性有限元分析,研究了码头在EIcentro波、Kobe波和Northridge波作用下结构的力学特性与抗震性能,分析了面板、桩基的动力响应及损伤特性。研究表明,码头结构的地震响应随着地震强度的增大而增大,地震波频谱特性对结构地震响应的影响较大;上部结构纵向预应力筋的设置能很好地保护桩顶节点,减少桩顶位移;桩基在泥面处及土层交界面处是结构响应较为强烈的部位;阻尼耗散了大部分地震输入的能量,通过损伤耗能可以确定结构发生脆性破坏的时间节点。

Aiming at the seismic response of integral box-slab high-pile wharf,the elastoplastic damage model coupled with finite element and infinite element was created by ABAQUS software.Through the nonlinear finite element analysis,we studied the mechanical properties and aiti-seismic performance of the wharf structure under EIcentro wave,Kobe wave and Northridge wave,and analyzed the dynamic response and damage characteristics of the panel and pile foundation.The results show that seismic response of the wharf structure increases with the increase of seismic intensity,and seismic wave spectrum characteristics have great impact on the seismic response of the structure.The arrangement of the longitudinal prestressed rebar of the superstructure can well protect the pile-head and reduce the displacement.The mud surface and the soil layer interface are the areas where the structural response is relatively strong;damping dissipates most of the seismic input energy,and the time node of brittle fracture failure can be determined by damage energy dissipation.