框剪结构简化振型及在高层建筑风振计算中的应用

根据高层建筑框架剪力墙结构体系的理论振型论证并归纳出控制框剪结构各阶振型形状的参数-结构刚度特征值λ;通过对与不同λ值相对应的理论基本振型曲线族进行非线性拟合,得出适用于高层建筑基本振型的简化模型,并给出通过结构刚度特征值λ计算振型幂指数β的简化方法;最后,将简化振型应用到三栋有代表性的高层建筑的风振计算中。研究结果表明,运用简化振型进行高层建筑风振计算,能更为准确地反映不同结构体系的振型形状对风荷载以及结构风致响应计算结果的影响,提高风荷载和结构风致响应的计算精度,且振型表达式简单实用。

Simplified Fundamental Mode Shape of Frame-Shear-Wall Structures and its Application in Wind Induced Dynamic Response Calculation of High-Rise Buildings

A parameter governing the fundamental mode shape of frame-shear-wall structures,that is structural stiffness characteristic valueλ,is introduced through analyzing theoretical mode shapes of high-rise buildings with frame-shear-wall structural system.Through nonlinear fitting to theoretical mode shape curves with different values ofλ,a simplified mode shape model suitable for fundamental mode shapes of high-rise buildings is presented;and the simplified method for calculating the exponential valueβin the simplified mode shape through characteristic valueλis given.Finally,three numerical examples of wind induced responsecal culation of real high-rise buildings are conducted to prove the applicability of the simplified fundamental mode shape presented in this paper.The result of the study shows that the simplified fundamental mode shape presented in this paper can reflect accurately the influence of different structural mode shapes on the wind load calculations and is simple and practicable for use;therefore,it can be used to improve the precision of wind load and wind induced response calculation of high-rise buildings.