楼梯对钢筋混凝土框架结构抗震性能影响研究

The Impact of the Stairs on the Seismic Performance Analysis of Reinforced Concrete Frame Structure

为了探究楼梯对钢筋混凝土框架结构抗震性能的影响。本文利用大型有限元软件ETABS建立了无楼梯和有楼梯两种钢筋混凝土框架结构计算模型,采用振型分解反应谱法对模型进行了地震反应特性计算。计算结果表明:楼梯参与高层框架结构计算后,有楼梯高层框架结构的前两阶振型明显缩短了约40.24%和43.79%,结构扭转参与系数超过了81.2%,同时楼梯间框架柱剪力大小和方向有了显著的突变。

To explore the impact of the stairs on the seis- mic performance analysis of reinforced concrete frame structure. In this paper, a large - scale finite element software ETABS computational model with two reinforced concrete frame structure of stairs, respectively using modal response spectrum method and time history analysis method to model the characteristics of seismic response calculation. The results show that： Stairs to participate in high - level framework structure calculated, modes of the high - level framework structure of the stairs the first two vibration modes approximately significantly shorter 40. 24% and 43.79%, structure to reverse the participation factor of more than 81.2% , with significant mutations stairwell framework the column shear force size and direction.