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根据饱和土Biot理论与最小势能原理及薄板理论,采用子结构法,把上部结构、基础和地基作为一个共同作用的整体,在接触界面上满足变形协调条件,建立移动荷载作用下饱和土体地基—筏板—上部结构共同作用的积分方程.对积分方程的数值求解和相应的Fourier逆变换,得到任意时刻上部结构、筏板的内力和位移以及地基反力.最后通过数值计算,分析了饱和土体参数、移动荷载的速度等对上部结构水平、垂直方向的振动的影响特点.数值结果表明,上部结构各层的水平位移、竖向位移都随荷载速度增大而增加.竖向位移随楼层增加变化不大,当荷载速度较低时,水平位移随上部结构高度的变化曲线平滑少弯折,说明振动较稳定.但当荷载速度较高时,水平位移随楼层变化曲折越明显,层间差异大.
According to the Biot theory of saturated soil and the principle of the minimum potential energy and thin plate theory, substructure method is adopted, the superstructure, foundations and foundations are taken as a co-acting whole body to meet the deformation coordination conditions at the contact interface and the saturated soil foundation - Integral equation of interaction between raft and superstructure. By numerical solution of integral equation and Fourier inverse transform, the internal forces and displacements of superstructure and raft at any time and the reaction force of foundation are obtained. Finally, by numerical calculation, Soil parameters and the velocity of moving load on the horizontal and vertical vibration of the superstructure.The numerical results show that the horizontal displacement and the vertical displacement of each layer in the superstructure increase with the increase of the load velocity.The vertical displacement When the load velocity is low, the horizontal displacement is smooth and less bend with the curve of the height of the superstructure, which shows that the vibration is more stable, but when the load velocity is higher, the horizontal displacement changes more obviously with the change of floor, Great difference between.