高耸钢筋砼筒体-钢框架塔台结构的地震响应  

Seismic response of tall tower of typical RC tube and steel frame composite structure under earthquake excitation

作　　者：范旭红[1] 石启印[1] 

机构地区：[1]江苏大学理学院,江苏镇江212013

出　　处：《江苏大学学报（自然科学版）》2004年第3期269-272,共4页Journal of Jiangsu University：Natural Science Edition

基　　金：江苏省建设厅科技基金资助项目(JS200321);镇江市社会发展基金资助项目(SH2003042)

摘　　要：以首都机场新塔台结构缩尺模拟地震振动台试验模型为研究对象,采用时程分析法分析高耸塔台结构各振型的地震响应,并对这种上下部由不同材料组成的复合结构(下部为钢筋砼筒体,上部为钢框架结构)的非经典振型阻尼比进行了探讨 研究结果表明,该结构地震位移响应可以不考虑高振型的影响,但应考虑高振型对地震响应内力的影响 该结构在地震作用下的运动方程可近似采用实模态强振解耦法 用现行规范方法求解地震响应时应对规范的地震影响系数进行修正,以消除计算误差Seismic response of each vibration mode of tall tower model is obtained based on time-historians analysis with respect to the reduced-scale model test. The modal damping ratio of the compound structure is discussed. The analysis of the calculation results reveals that the high-order modes contribute little to the seismic displace of the tower. However, the high-order modes play an important role in the seismic shear force of the tower. A real mode-decoupling method can be used to solve the dynamic equilibrium under earthquake forces. Revisions of influence coefficient in the seismic code for buildings are presented in order to minimize the calculation error. The results will contribute to the earthquake resistant design theory and provide reference to earthquake resistant analysis of this kind of structure.

关 键 词：高耸塔台结构 地震响应 高振型影响 振型阻尼比 模态解耦法 

分 类 号：TU973.31[建筑科学—结构工程] TU317.1