【摘要】 以某长江公路大桥大型群桩基础为研究对象,以ABAQUS有限元软件为计算平台,采用整体有限元法对桥梁群桩基础的地震反应进行了数值模拟计算,选取三条傅氏谱频谱特征明显不同的地震波,考虑了土体和混凝土的非线性特征,分析了深厚场地上大型桥梁群桩基础的动水压力效应。结果表明:动水压力效应改变了桥梁群桩基础的地震反应特性,对桩身的加速度、位移和内力反应有不同程度的影响。对于大型桥梁基础抗震计算,分析群桩基础动水压力效应的影响更符合工程实际。更多还原

【Abstract】 Taking the large group piles foundation of the Changjiang River Road Bridge as a research project,and computing on ABAQUS finite element software,and using the added water mass method to consider the effects of hydrodynamic pressure,the seismic response of the bridge group-piles was calculated numerically by the whole finite-element method,three earthquake waves with different spectra was selected,dynamic nonlinear characteristics of soils and concrete was considered,and the hydrodynamic pressure effect of the large group piles foundation for bridge on deep overburden layers was analyzed.The results showed that hydrodynamic pressure effect changed the seismic responses characters of the group piles foundation,which had the impact on the acceleration,displacement and inner force of the pile.It complies much more with the actual situation considering the hydrodynamic pressure effect in the seismic design of a large bridge foundation.更多还原