考虑偶然偏心的动力近似抗震分析研究  

STUDY ON DYNAMICAL APPROXIMATE COMPUTATIONAL METHOD FOR SEISMIC ANALYSIS INCLUDING ACCIDENTAL ECCENTRICITY

作　　者：尹家聪[1] 李浩 陈璞[1] 

机构地区：[1]北京大学工学院,湍流与复杂系统国家实验室&力学与空天技术系,北京100871 [2]商务部国际经济合作事务局,北京100747

出　　处：《工程力学》2011年第6期81-87,共7页Engineering Mechanics

基　　金：国家自然科学基金项目(10972005)

摘　　要：针对高层建筑计算单向水平地震响应时的偶然偏心,该文讨论了振型分解反应谱法与等效扭矩近似法两种动力计算方案;通过二组算例,给出了偏心后两种方案的计算结果随侧扭周期比的变化曲线。研究表明:与振型分解反应谱法相比,等效扭矩近似法在侧扭周期比大于1.8时具有较好的计算精度,但在侧扭周期比接近1.0时可能低估构件的内力值,在实际计算中应予修正以保证结构设计安全。Two dynamical analysis methods are discussed in this paper for an accidental eccentricity during the computation of horizontal seismic responses of tall buildings.They are the modal response spectrum analysis method and the equivalent torque method.The results of two groups of structures demonstrated graphically in terms of the ratio of uncoupled lateral and torsional periods show that the equivalent method has a good precision when the ratio of periods is larger than 1.8.However,it may underestimate member forces if the ratio is close to 1.0.Therefore,a modified approach should be involved in applications.

关 键 词：抗震设计 偶然偏心 振型分解反应谱法 等效扭矩计算方案 侧扭周期比 

分 类 号：TU973.31[建筑科学—结构工程]