基础隔震结构考虑摆动的地震响应分析
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摘要
上部结构层间刚度相对较小、垂直荷载也较大的多层框架结构,其所采用的多层橡胶垫的橡胶总厚度较大,可能产生明显的竖向变形,因而导致结构摆动.对基础隔震体系进行了平摆动结构模型分析,推导了在地震作用下结构平摆动的运动方程,采用Matlab编程进行计算机仿真分析.研究结果表明,结构考虑摆动时顶层位移反应与不考虑摆动时相差较大;结构底板转动刚度和隔震层阻尼对基础隔震结构地震响应有明显影响.
Multi-story frame structure,which upper story rigidity is smaller,and with a bigger vertical load,when using multi-story packing rubber,the total thickness is bigger and possibly has an obvious vertical displacement.The model of horizontal translation and swing in base-isolated structures is analysed,the horizontal & swing structure's vibration equation is infered under the seismic function,and the Matlab programming is applied to carry on the computer simulation analysis.The conclusions suggest that the top layer displacement of structure with horizontal & swing is a little bigger,compared with the only consideration of structure's stable,and rotation rigidity and damping ratio of the isolation obviously influence the earthquake response of base isolated structures.
Multi-story frame structure,which upper story rigidity is smaller,and with a bigger vertical load,when using multi-story packing rubber,the total thickness is bigger and possibly has an obvious vertical displacement.The model of horizontal translation and swing in base-isolated structures is analysed,the horizontal & swing structure's vibration equation is infered under the seismic function,and the Matlab programming is applied to carry on the computer simulation analysis.The conclusions suggest that the top layer displacement of structure with horizontal & swing is a little bigger,compared with the only consideration of structure's stable,and rotation rigidity and damping ratio of the isolation obviously influence the earthquake response of base isolated structures.
引文
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[7]杨佑发,周福霖.隔震结构地震反应分析的实用计算方法[J].世界地震工程,2000,16(1):72-76.
[2]刘伟庆,王曙光,林勇.宿迁市人防指挥大楼隔震设计方法研究[J].建筑结构学报,2005,26(2):81-86.
[3]Palazzo B,Petto L.Response of Base Isolated Systemto Random Excitations[J].European Earthquake Engi-neering,1996,10(2):225-235.
[4]徐赵东,郭迎庆.MATLAB语言在建筑抗震工程中的应用[M].北京:科学出版社,2004.
[5]Kelly J M.Base isolation:Liner theory and design[J].Earthquake Spectra,1990,6(2):179-182.
[6]周福霖.工程结构减震控制[M].北京:地震出版社,1997.
[7]杨佑发,周福霖.隔震结构地震反应分析的实用计算方法[J].世界地震工程,2000,16(1):72-76.
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