摘要
采用振型分解反应谱法计算带加强层的高层、超高层建筑的地震作用时,通常需要考虑高阶振型的影响,于此类周期比较长、高阶振型影响显著的结构,往往需要考虑较多的振型,计算过程较为复杂。通过对带加强层高层建筑结构在侧向荷载作用下的受力和变形特点进行分析发现带加强层高层建筑结构在侧向荷载作用下内筒及外柱等构件的变形及内力在加强层处发生突变,加强层刚度较大时,类似于在加强层处给结构增加了一个"整体转动嵌固",整体转动嵌固近乎将结构从加强层处分为单独几部分。本文根据带加强层高层建筑的结构特点,提出一种计算其地震作用的简化方法,通过考虑较少的振型即可得到相对于振型分解反应谱法较为精确的结果。此法是结构初步设计中一种有效的计算地震作用的方法。
According to the mode superposition response spectrum method,calculating the earthquake action on high-rise structure with strengthened stories needs to consider the contributions of many modes.When subjected to lateral loads,the internal force and deformation change radically near the strengthened stories,and the strengthened stories are similar to an ＂integral rotation constraint＂ for the structure above them.If the stiffness of outriggers is larger enough,they nearly divide the structure into several independent parts.Based on this feature,a simplified method for calculating earthquake action on structure with strengthened stories is proposed in this paper,which is applicable in preliminary design of structures.
出处
《地震工程与工程振动》
CSCD
北大核心
2011年第3期140-147,共8页
Earthquake Engineering and Engineering Dynamics
基金
温州市科技局科技计划项目(S20090042)
关键词
加强层
高层建筑
高阶振型
简化算法
strengthened story
high-rise structure
higher modes
simplified method
