SV波超临界角斜入射时层状地基地震动输入在ABAQUS中的实现

有限元数值模拟中,超临界角斜入射SV波作用下层状地基的地震动输入是一个亟待解决的问题.该文采用层状地基频域内精确的动力刚度矩阵(即频域刚度矩阵法)推导了SV波任意角度斜入射下的地震动输入等效节点力计算公式,通过ABAQUS有限元软件模拟SV波斜入射下均匀半空间、层状地基的地震波场,探讨了基于频域刚度矩阵法的层状地基任意...

REALIZATION OF GROUND MOTION INPUT IN ABAQUS FOR LAYERED FOUNDATION UNDER SV WAVE OF OBLIQUE INCIDENCE OVER CRITICAL ANGLE

In the finite element numerical simulation,it is an urgent challenge to determine the ground motion input for the layered foundation under SV wave of oblique incidence over critical angle.Exact dynamic stiffness matrix in the frequency domain(i.e.,frequency domain stiffness matrix method)of layered foundation is used to derive the formula for calculating the equivalent node force of ground motion input under arbitrary angular oblique incidence of SV wave,and the validity and accuracy of the ground motion input applied to ABAQUS numerical simulation are demonstrated by simulating seismic wave field of homogeneous half-space and layered foundation under oblique incidence of SV wave through ABAQUS software.It is shown that the inclined SV wave incidence with an arbitrary angle can be realized through ABAQUS simulation by means of stiffness matrix method,and the method is of high accuracy,especially in the case of SV wave incidence with an inclined angle greater than the critical one.The oval like motion trails of surface particles in uniform half space and the wave motion characteristics of layered half space are simulated commendably by finite element numerical modelling.On the above basis,the frequency domain stiffness matrix method is further combined with equivalent linearization method,which solves the ground motion input problem of two-dimensional layered half space considering soil nonlinearity for the inclined incidence with arbitrary angle.