楼梯设置橡胶支座框架结构抗震性能研究

Research on seismic performance of frame structures with rubber isolation bearings in staircases

为减轻楼梯在地震作用下的破坏,本研究拟在框架结构楼梯间梯段板下端设置橡胶隔震支座并对其抗震性能进行研究。首先,利用ETABS分析软件,分别建立了不设置楼梯、设置现浇楼梯和在楼梯梯段板下端设置橡胶隔震支座的钢筋混凝土框架结构模型;然后,采用反应谱和非线性时程分析法,对比研究了地震作用下楼梯和橡胶隔震支座对框架结构受力性能的影响。研究结果表明,楼梯的存在会显著改变结构的自振周期、楼层刚度、层间位移角等参数,而在楼梯梯段板下端设置橡胶隔震支座后,楼梯梯柱、梯梁内力明显减小,结构的抗震性能得到明显改善。

To reduce the damage of stairs under earthquake,the rubber isolation bearings are set at the lower end of staircase slab of frame structure is proposed and its seismic performance is researched.Firstly,using ETABS analysis software,the reinforced concrete frame structure models with no stairs,cast-in-place stairs and rubber bearings at the lower end of the staircase slab are established respectively.And then the response spectrum analysis and nonlinear time history analysis are used to compare the influence of stairs and rubber bearings on the mechanical performance of frame structures under earthquake.The analysis results show that the existence of stairs will significantly change the natural vibration period,floor stiffness,inter-story displacement angle and other parameters of the structure,and the internal force of the stair column and beam is obviously reduced and the seismic performance of the structure is significantly improved after the rubber isolation bearing is installed at the lower end of the staircase slab.