楼梯对规则隔震结构减震性能的影响研究

摘要

隔震结构设计一般要求上部结构尽量规则,避免扭转的不利影响,为了研究规则结构中楼梯对隔震结构减震性能的影响,本文建立了考虑楼梯作用的隔震结构动力方程,提出采用附加系数法对该动力方程进行简化,以某规则的实际隔震工程的基本参数为基础,应用数值分析软件Matlab2010对该简化方程进行了数值分析,主要分析了6种不同刚度附加系数时隔震结构在7条地震波作用下42个工况的动力时程响应,研究了其减震效果的变化规律,最后采用实际工程对所得结论进行了验证.结果表明在规则结构中,楼梯对于隔震结构的减震性能影响明显.考虑楼梯影响后上部结构层位移和层间位移角均减小,隔震结构的水平向减震系数降低,结构减震效果明显,从而确保地震过程中上部结构更加安全.所得结论可为隔震结构的设计提供必要参考依据.%In general,the superstructure of isolation structure was a regular structure to avoid adverse effect of torsion in the isolation structure design.In order to research the influence of stair for aseismic performance of regular isolation structure,the motion equation of isolation structure with stairs was established in this paper,and was simplified by an additional coefficient method provided,and was further analyzed by Numerical analysis software Matlab 2010 using the basic parameters of a practical regular isolated structure engineering.The dynamic time history response of isolation structure was mainly discussed under 42 conditions composed of 6 kinds of additional coefficient and 7 earthquake waves,and the aseismic effects of isolation structure were researched under the different conditions.Finally,the conclusions were verified by using a practical engineering.The results show that the stair of regular structure has a great influence on the aseismic performance of isolation structure.Considering the effect of stair,the value of story drift and story drift angle of the superstructure for isolation structure decreases,and the horizontal seismic decrease coefficient of the isolation structure is reduced,and the aseismic effect is very obvious,and this makes the superstructure of isolation structure more safety when the earthquakes occur.The conclusions should be a reference for the design of isolation structure.