上海中心大厦输入地震动分析与选用
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摘要
对上海中心大厦基于性能的抗震设计所采用的地震波的选用进行了研究。由于上海地区场地特征周期较长,对于自振周期也较长的超高层建筑结构的抗震极为不利。因此,选用合理准确的地震波进行时程分析对于上海这类软土场地上建设的超高层建筑结构基于性能的抗震设计至关重要。在地震波的选用中综合考虑了场地类别、地震波数量、频谱特性、有效峰值、持续时间、统计特性、震源机制以及工程判断等方面的要求,同时给出上海中心大厦项目选用地震波的流程。最后,基于所选用的地震波,给出了结构弹性和弹塑性分析的结果。
The ground motion evaluation procedure for the performance-based seismic design of Shanghai Tower was addressed.The site specific ground motions in Shanghai are characterized by high long period components,which is a serious disadvantage for super high-rise buildings with long vibration periods.The high quality ground motions are vital for performance-based seismic design of super high-rise buildings in very soft site like Shanghai area.The critical topics for the ground motion evaluation procedure,including the site effects,ground motion number,spectrum characteristics,effective peak ground motion,time history scaling,time duration,fault mechanism and stochastic characteristics of the structural responses,were fully discussed.A ground motion evaluation procedure was proposed,and was applied in Shanghai Tower project to show the effectiveness of the procedure.Finally,the application method of the selected ground motions in the elastic and elasto-plastic time history analysis of Shanghai Tower was discussed.
The ground motion evaluation procedure for the performance-based seismic design of Shanghai Tower was addressed.The site specific ground motions in Shanghai are characterized by high long period components,which is a serious disadvantage for super high-rise buildings with long vibration periods.The high quality ground motions are vital for performance-based seismic design of super high-rise buildings in very soft site like Shanghai area.The critical topics for the ground motion evaluation procedure,including the site effects,ground motion number,spectrum characteristics,effective peak ground motion,time history scaling,time duration,fault mechanism and stochastic characteristics of the structural responses,were fully discussed.A ground motion evaluation procedure was proposed,and was applied in Shanghai Tower project to show the effectiveness of the procedure.Finally,the application method of the selected ground motions in the elastic and elasto-plastic time history analysis of Shanghai Tower was discussed.
引文
[1]吴迪,罗奇峰,罗永峰.长周期地震波的研究进展[J].地震研究,2007,30(3):296-302.
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[3]翁大根,徐植信.对上海市抗震设计反应谱及时程曲线的认识——答“关于上海市《建筑抗震设计规程》中长周期设计反应谱的讨论”[J].地震工程与工程振动,2001,21(1):79-83.
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[6]吕西林,李培振,郭献群,等.上海环球金融中心大厦振动控制及现场实测分析[J].结构工程师,2009,25(4):63-70.
[2]俞言祥,胡聿贤.关于上海市《建筑抗震设计规程》中长周期设计反应谱的讨论[J].地震工程与工程振动,2000,20(1):27-34.
[3]翁大根,徐植信.对上海市抗震设计反应谱及时程曲线的认识——答“关于上海市《建筑抗震设计规程》中长周期设计反应谱的讨论”[J].地震工程与工程振动,2001,21(1):79-83.
[4]翁大根,徐植信.上海地区抗震设计反应谱研究[J].同济大学学报,1993,21(1):9-16.
[5]俞言祥.长周期地震动研究综述[J].国际地震动态,2004(7):1-5.
[6]吕西林,李培振,郭献群,等.上海环球金融中心大厦振动控制及现场实测分析[J].结构工程师,2009,25(4):63-70.
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