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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。
Taking the large group pile foundation of a Yangtze River Highway Bridge as the research object and the finite element method of ABAQUS as the calculation platform, the seismic response of the bridge group pile foundation is numerically simulated using the integral finite element method. The spectral characteristics of the three Fourier spectra are obviously different Seismic wave considering the nonlinear characteristics of soil and concrete, and analyzing the hydrodynamic pressure effect of pile foundation of large bridge group on deep site. The results show that the hydrodynamic pressure effect changes the seismic response characteristics of bridge group pile foundation, and affects the pile’s acceleration, displacement and internal force response in varying degrees. For the seismic calculation of large bridge foundation, the effect of analyzing hydrodynamic pressure effect on pile foundation is more in line with engineering practice.