桩基多层框架结构对水平地震荷载的响应

Respones of the multi—storey frame on the Pile Foundation to Horizontal Earth Quake

通过对建筑在桩基上的多层框架结构的上部结构、桩基础、地基共同工作时的运动分析,建立结构系统的运动微分方程.采用桩基承台的水平位移及转角为广义坐标,将多自由系统的动力学问题转化为二自由度系统问题求解.在求系统运动微分方程基础上,得到承台的水平位移和转角.从而求得上部结构各层的位移、速度、加速度、惯性力及上部结构对基底的剪力和弯矩.

In this paper,by means of analysis the interaction between the upper structure, pile and soil foundation,the author establishes the differential equations of structure system.Using the horizontal displacement and rotation angle of the plateform as generalized coordinates,the author transforms dynamics of multi —freedoms into the dynamics of two freedoms and obtains the horizontal displacement and the rotation angle of plateform.Further,the horizontal displacement,speed,acceleration and inertial force for each storey of the upper structure are obtained.Also the author obtains the shear force and bending moment of upper structure on the foundation.