土与一般刚度偏心结构地震动力相互作用的研究  

Seismic behaviors of general stiffness eccentric structures considering soil-structure interaction

作　　者：甘志兴[1] 李春祥[1] 

机构地区：[1]上海大学土木工程系,上海200072

出　　处：《四川建筑科学研究》2014年第2期199-205,共7页Sichuan Building Science

基　　金：上海大学创新基金(SHUCX120151)

摘　　要：采用极坐标表示楼层任意刚度偏心位置,能更加详细地分析结构各层刚度中心在任意位置的偏心对结构平移-扭转耦合地震响应的影响,另外考虑实际边界条件,即并入土与结构相互作用(SSI)以达到结构整体性能,因而提出了分析土与一般刚度偏心结构地震动力相互作用的基本框架。首先,采用极坐标建立双向地震作用下两层一般刚度偏心结构(GSES)的动力方程(6个自由度);接着,使用5个自由度土阻抗函数来表征土与一般刚度偏心结构相互作用;最后,建立土与一般刚度偏心结构相互作用(SGSESI)的动力方程,使用SGSESI系统的标准化均方根位移和加速度来分析其地震动力相互作用。通过设置不同的刚度偏心位置,数值研究了在双向地震作用下,考虑SSI的同轴、非同轴刚度偏心对结构平-扭耦合地震响应的影响。Using polar coordinates to represent the floors of any stiffness eccentric position can more detailed analyse the coupled lateral- torsional seismic responses of a structure whose atiffness centers at different floors are located on anyplace,and considering the actual boundary conditions, what is the structure interaction （SSI）, in order to achieve the real performance of the structure. A basic framework of analyzing the seismic dynamic interaction of the soil-general stiffness eccentric structure is presented here. First, using the polar coordinates to develop the dynamic equations of a two-storey general atiffness eccentric structure （GSES） with the 6-degree-of- freedom （6DOFs） under the bi-directional earthquakes. Then,with resorting to the 5DOF soil impedance functions to characterize the soil-general asynnnetric-plan structure interaction （SGSESI）. Finally,integrating the dynamic equations of both GSES and soil-structure （whole） interaction. The normalized root-mean-square （RMS） seismic displacement and acceleration responses of the SGSESI system are derived. Numerical study on the effects of both the coaxial-axis and non-coaxial atiffness eccentricities on the coupled lateral- torsional seismic responses are analyzed through setting different locations of stiffness eccentricity under the bi-directional earthquakes.

关 键 词：一般刚度偏心结构 土与结构相互作用 耦合动力分析 极坐标 双向地震 

分 类 号：TU311[建筑科学—结构工程]