土-结构相互作用振动台试验模型简化方法探讨
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摘要
考虑到地震模拟振动台本身的承载能力限制、土体及边界条件模拟的复杂性、模型缩尺比例不能过小等因素,提出了一种在地震模拟振动台试验中简化考虑土-结构相互作用的方法,并以某海上高耸塔结构为例说明了该方法的可行性。利用有限元软件ETABS9.0.0建立了两个三维有限元模型:考虑土-结构相互作用模型(模型A)和简化模型(模型B)。其中,模型B上部结构与模型A相同,通过模态分析、反应谱分析和时程分析反复调整基础结构形式,使两个模型的上部结构地震反应相同。调整得到的模型B,即为考虑土-结构相互作用的简化模型,可为土-结构相互作用地震模拟振动台试验提供参考。
This paper proposes a simplified method conducting earthquake simulation test on shaking table for high-rise tower structure with consideration of soil-structure interaction to overcome the limitation of the load-bearing capacity,the size of the shaking table and the difficulty in simulating both of the soil foundation and its' boundary condition in experimental practice.An off-shore high-rise tower structure was taken as the example for developing the proposed simplified method.A 3-D finite element analysis model(Model A) considering the soil-structure interaction and a simplified model(Model B) were built.Both models are equipped with the same upper structure.According to results of numerical modal analyses,response spectrum analyses,and time-history analyses,the form of foundation structure was adjuset repeatedly so that the seismic responses of superstructure of both Model A and Model B are same.Model B is precisely the simplified model considering soil-structure interaction which could be used for shaking table test.
This paper proposes a simplified method conducting earthquake simulation test on shaking table for high-rise tower structure with consideration of soil-structure interaction to overcome the limitation of the load-bearing capacity,the size of the shaking table and the difficulty in simulating both of the soil foundation and its' boundary condition in experimental practice.An off-shore high-rise tower structure was taken as the example for developing the proposed simplified method.A 3-D finite element analysis model(Model A) considering the soil-structure interaction and a simplified model(Model B) were built.Both models are equipped with the same upper structure.According to results of numerical modal analyses,response spectrum analyses,and time-history analyses,the form of foundation structure was adjuset repeatedly so that the seismic responses of superstructure of both Model A and Model B are same.Model B is precisely the simplified model considering soil-structure interaction which could be used for shaking table test.
引文
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[5]王东坡,钱德玲.支盘桩-土-上部结构动力相互作用体系的振动台模型试验设计[J].合肥工业大学学报,2008,31(5):776-781.
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[8]山东省地震工程研究院.威海-刘公岛空中快车跨海运输系统及威海之星海上观光塔工程场地地震安全性评价工作报告[R].哈尔滨:中国地震局工程力学研究所,2006.
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[10]谢礼立,翟长海.最不利设计地震动研究[J].地震学报,2003,25(3),250-261.
[11]翟长海,谢礼立.抗震结构最不利设计地震动研究[J].土木工程学报,2005,38(12),51-58.
[2]石磊.高层建筑土-结构相互作用地震反应分析方法[D].哈尔滨:中国地震局工程力学研究所,2005.
[3]梁丰,吕西林,陈跃庆.结构—地基动力相互作用试验研究综述[J].结构工程师,2004,3:57-71.
[4]张之颖,赵钟斗,吕西林,楼梦麟.SSI体系阻尼特性振动台模型试验研究[J].土木工程学报,2010,43(2):100-104.
[5]王东坡,钱德玲.支盘桩-土-上部结构动力相互作用体系的振动台模型试验设计[J].合肥工业大学学报,2008,31(5):776-781.
[6]Tamura Shuji,et al.Dynamic Response and Failure Mechanisms of a Pile Foundation During Soil Liquefaction by Shaking Table Test with a LargeScale Laminar Shear Box[A].12WCEE,2000,Paper No.0903.
[7]王艳茹.考虑桩基效应的塔结构振动台试验方法数值模拟[D].哈尔滨,中国地震局工程力学研究所,2007.
[8]山东省地震工程研究院.威海-刘公岛空中快车跨海运输系统及威海之星海上观光塔工程场地地震安全性评价工作报告[R].哈尔滨:中国地震局工程力学研究所,2006.
[9]中华人民共和国行业标准《高层民用建筑混凝土结构技术规程》(JGJ 3-2002,J 186-2002)[S].北京:中国建筑工业出版社,2002.
[10]谢礼立,翟长海.最不利设计地震动研究[J].地震学报,2003,25(3),250-261.
[11]翟长海,谢礼立.抗震结构最不利设计地震动研究[J].土木工程学报,2005,38(12),51-58.
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