不同隔振方案下混凝土框架结构的抗震性能对比与优化分析

Analysis of Seismic Performance of Concrete Frame Structure Under Different Vibration Isolation Schemes

为了分析和对比不同隔振方案下混凝土框架结构的抗震性能,建立了混凝土框架三维模型,设定基础隔振、2层隔振、4层隔振和6层隔振四种隔振方案,对地震输入参数和隔振支座参数进行了研究,依据SAP软件内置的EL波和CPC波,分析了模型的基础剪应力、层间剪应力和顶层结构加速变化规律。结果表明:不同地震波输入后,有隔振的模型层间剪应力、基础剪应力和顶层加速度相较于无隔振方案均大幅降低,但水平方向上差别不大;采用基础隔振和2层隔振后,模型的基础剪应力从10988~13666 kN降至2366~3544 kN,降低幅度达73%~81%;四种隔振方案的综合评价值分别为0.89、0.91、0.83和0.70,其中,2层隔振方案的施工成本和抗震性能均最优,基础隔振方案次之,但施工成本稍高,4层和6层隔振方案较差。

In order to analyze and compare the seismic performance of concrete frame structure under different vibration isolation schemes,a three-dimensional model of concrete frame structure was established,and four vibration isolation schemes were set for foundation vibration isolation,2-story vibration isolation,4-story vibration isolation,and 6-story vibration isolation,and the seismic input parameters and vibration isolation support parameters were studied.According to the built-in EL wave and CPC wave of SAP software,the variation laws of foundation shear stress,interlayer shear stress and acceleration of top structure of the model were analyzed.The results show that after different seismic waves are input,the interlayer shear stress,foundation shear stress and top floor acceleration of the vibration isolation model are significantly reduced compared with those without vibration isolation scheme,but there is little difference in the horizontal direction.For foundation vibration isolation and 2-story vibration isolation,the foundation shear stress of the model decreases from 10988~13666 kN to 2366~3544 kN,with a reduction range of 73%~81%.The comprehensive evaluation values of the four vibration isolation schemes are 0.89,0.91,0.83 and 0.70 respectively.Among them,the construction cost and seismic performance of the 2-story vibration isolation scheme are the best,and the foundation vibration isolation scheme is the second,but the construction cost is slightly higher,and the 4-story and 6-story vibration isolation schemes are poor.