三维非均质土中粘弹性桩-土纵向耦合振动响应

在考虑土体三维非均质性情况下,对变截面粘弹性桩的动力特性进行研究。首先,结合边界条件,利用复刚度传递平面应变土体模型求得纵向不同性质桩侧土层的复刚度,进而对各段变截面桩身从下往上逐段推导得到单桩桩顶受纵向激振力作用下的桩基振动的频域响应解析解;然后,利用卷积定理和Fourier逆变换得到桩顶的时域响应半解析解;最后,研究分析桩土参数对桩顶动力响应的影响,得到了桩顶频域和时域响应的规律性,为桩基础的抗震设计和桩的完整性检测工作提供新的理论依据。

Axial Response of Viscoelastic Pile-soil Coupling Interaction in Three-dimensional Inhomogeneous Soil

Considering the three-dimensional inhomogeneity of soil surrounding the pile,the response of non-uniform viscoelastic pile under axial dynamic loading is studied.Firstly,combining the boundary condition,the complex stiffness of axial different soil layers are obtained by the complex stiffness transfer model of radial multi-zone plane strain.Then,the analytical solution of dynamic response at pile top in frequency domain is proposed by solving the dynamic equation of non-uniform viscoelastic pile section one by one from the bottom up to the top,and the relevant semi-analytical solution response in time domain is adopted by the convolution theorem and the Inverse Fourier Transform.At last,the effect of parameters of pile and soil are investigated to get the nature of the dynamic response of pile top in frequency domain and time domain.