考虑桩-土-结构相互作用影响的多层厂房振动分析
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摘要
通过引入黏弹性人工边界,建立了桩-土-结构相互作用的厂房整体有限元分析模型,对设备作用下的多层厂房振动进行较为全面的分析,并就模型简化及桩-土体系对系统的影响进行对比研究。实例计算表明:桩-土体系的参与降低了系统自振频率,并对结构的动力响应产生了一定的影响,但在水平与竖向两个方向上存在差异。高频设备荷载作用下,桩-土体系的参与对厂房的水平振动影响不大,而会造成结构竖向动力响应放大。桩体在水平振动表现为弯曲变形,变形主要集中在上部,在竖向振动中则表现为整体振动。
By considering viscous-spring boundary,the holistic pile-soil-structure dynamic finite element model of multi-story factory buildings was built,then the vibration of factory buildings were studied more entirely,model simplifying methods and the effect of pile-soil system were analyzed and compared.Some things were get from computed examples,the pile-soil system can reduce the natural frequencies of structures and have effects on dynamic response of structures,but there was some differences between horizontal and vertical vibration.Under the forces with high frequency,pile-soil system has little effect on the horizontal vibration,but it can enlarge the vertical vibration,the flexural distortion of piles happened near top in the horizontal vibration,and the whole piles participate in vertical vibration.
By considering viscous-spring boundary,the holistic pile-soil-structure dynamic finite element model of multi-story factory buildings was built,then the vibration of factory buildings were studied more entirely,model simplifying methods and the effect of pile-soil system were analyzed and compared.Some things were get from computed examples,the pile-soil system can reduce the natural frequencies of structures and have effects on dynamic response of structures,but there was some differences between horizontal and vertical vibration.Under the forces with high frequency,pile-soil system has little effect on the horizontal vibration,but it can enlarge the vertical vibration,the flexural distortion of piles happened near top in the horizontal vibration,and the whole piles participate in vertical vibration.
引文
1 Aboul-Ella F,Novak M.Dynamic Response of Pile-SupportedFrame Foundation,Journal of Engineering Mechanics Division,ASCE,1980,EM6:1 215-1 232
2 GB 54096-96动力机器基础设计规范
3龚维明.桩支承的多层厂房水平随机振动的桩-土-上部结构共同作用动力分析.建筑结构,1995(1):18-20
4谷音.结构-地基动力相互作用问题高效数值方法研究及工程应用.北京:清华大学,2005
5黄菊花,何成宏,杨国泰,等.地基中振动波传播的有限元分析.振动与冲击,1999,18(1):38-43
6刘晶波,王振宇,张克峰,等.考虑土-结构相互作用动力机器基础三维有限元分析.工程力学,2002,19(3):34-38
7王振宇,刘晶波.成层地基非线性波动问题人工边界与波动输入研究.岩石力学与工程学报,2004,23(7):1 169-1 173
8杜修力,赵密,王进廷.近场波动模拟的人工应力边界条件.力学学报,2006,38(1):49-56
9熊辉,邹银生,许振宇.层状场域内桩-土-上部结构的整体动力有限元模拟.土木工程学报,2004,37(9):55-61
10曹晓岩,李晓莉,李立新,等.桩-土-结构相互作用地震反应分析.世界地震工程,2004,20(1):90-94
2 GB 54096-96动力机器基础设计规范
3龚维明.桩支承的多层厂房水平随机振动的桩-土-上部结构共同作用动力分析.建筑结构,1995(1):18-20
4谷音.结构-地基动力相互作用问题高效数值方法研究及工程应用.北京:清华大学,2005
5黄菊花,何成宏,杨国泰,等.地基中振动波传播的有限元分析.振动与冲击,1999,18(1):38-43
6刘晶波,王振宇,张克峰,等.考虑土-结构相互作用动力机器基础三维有限元分析.工程力学,2002,19(3):34-38
7王振宇,刘晶波.成层地基非线性波动问题人工边界与波动输入研究.岩石力学与工程学报,2004,23(7):1 169-1 173
8杜修力,赵密,王进廷.近场波动模拟的人工应力边界条件.力学学报,2006,38(1):49-56
9熊辉,邹银生,许振宇.层状场域内桩-土-上部结构的整体动力有限元模拟.土木工程学报,2004,37(9):55-61
10曹晓岩,李晓莉,李立新,等.桩-土-结构相互作用地震反应分析.世界地震工程,2004,20(1):90-94
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