竖向地震作用下框筒结构整体稳定分析  

Analysis of the Overall Stability of Frame-Tube Structures Under Vertical Seismic Action

作　　者：傅赣清[1] 李丽娟[1] 

机构地区：[1]广东工业大学建设学院,广东广州510643

出　　处：《建筑结构学报》2001年第3期27-30,共4页Journal of Building Structures

基　　金：广东省自然科学基金!(990148)资助

摘　　要：本文推导了带刚域杆件考虑轴压力效应和剪切变形时的单元刚度方程，将框筒结构展开为等效平面框架，按集中质量模型计算竖向地震作用，然后，分别计算了设防烈度 7度、 8度和 9度的小震情况下，相对于楼层重力荷载的临界荷载因子 pcr。计算结果表明 ,竖向地震作用对框筒结构的整体稳定影响显著。考虑竖向地震作用后，临界荷载因子值 pcr减小，当设防烈度为 9度， pcr值减小约 17％。The stiffness equation of bar element with rigid zones at ends is deduced which involves the effects of axial compressive force and shear deformation. The frame- tube structure is unfolded as plane frame and vertical seismic action is calculated according to the method of lumped mass. Then pcr--the values of the critical load factor in respect of gravity load stability of the structure in consideration of vertical seismic action corresponding to 7,8 and 9 degree of the earthquake intensity are computed respectively. The result indicates that the vertical seismic action greatly affects the overall stability of the structure and the value pcr decreases as compared with those taking no account of it. The value pcr decreases by 17％ when the earthquake intensity is 9 degree.

关 键 词：框筒结构 竖向地震作用 高层建筑 稳定性 

分 类 号：TU973.25[建筑科学—结构工程]