复杂竖向混合结构的交界面楼层反应谱分析

Analysis of interface floor response spectrum of complex hybrid structure

为了了解中国航海博物馆工程这一包括钢结构和混凝土结构的复杂竖向混合结构的地震响应特点,利用ANSYS程序对该工程进行了抗震分析,分析中采用了谱分析法和时程分析法,并求出了该混合结构的交界面楼层反应谱.计算结果表明:结构变形满足规范限值,下部混凝土结构对地震动输入有放大作用,使得钢网架底部加速度输入远大于地震地面运动加速度,建议上部钢结构单独进行抗震设计时,采用多条地震波输入下的楼层反应谱的包络作为设计地震输入谱.

In order to explore the seismic response characteristics of the complex hybrid structure-Chinese Navigation Museum,which consisted of steel structure and concrete structure,seismic analy-sis was carried out by ANSYS program.Spectrum analysis and time history analysis were adopted in the analysis,and the interface floor response spectrum was figured out.The calculation results dem-onstrate that the deformation satisfy the allowable values of the relevant codes.The bottom concrete frame structure has amplification effect on the inputted ground motion,which cause that the accelera-tion inputted on the bottom of steel grid structure is much larger than that on the ground.It is sug-gested that the envelope line of floor spectra under the action of multiple seismic waves should be adopted as the design seismic input spectrum when the steel structure is designed separately.