【摘要】 基于基础隔震体系的动力特性提出将阻尼器安装在框架结构底部楼层的优化布置策略。首先通过计算场地特征频率ω与减震结构底部隔震层固有频率ωn的比值初步确定结构底部安装阻尼器的楼层数;随后针对减震结构层间位移容许值,通过几次简单的试算即可最终确定所需的阻尼器数量及其安装位置。采用Etabs和Perform-3D两种分析软件,选取2条实际强震纪录和1条人工模拟的加速度时程曲线对一栋10层的减震结构进行了弹性和弹塑性时程分析,表明在底部楼层安装阻尼器的减震结构具备与基础隔震体系类似的动力特性。更多还原

【Abstract】 An optimal distribution strategy of the energy dissipation dampers installed in the bottom stories of frame structures was put forward based on dynamic characteristics of base-isolated system.Firstly,the number of stories was defined by calculating the ratio of site characteristic frequency ω and bottom isolation stories natural frequency ωn of energy dissipation structure.Then,with regard to storey drift permissible value,the quantity and installation positions of dampers were defined through several simple calculations.2 sets of actual strong earthquake records and 1 set of artificial acceleration time-history curve for a 10 stories frame structure were selected to conduct the time-history analysis under frequently and rarely earthquakes by ETABS software and Perform-3D software.The results show that the dynamic characteristics of energy dissipation structure in which the dampers are installed in lower stories are similar to those of base-isolated system.更多还原