褥垫层作用下复合地基抗震性能有限元分析
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摘要
采用大型非线性有限元程序ADINA,针对复合地基-基础-上部结构典型算例,建立了计算模型,并进行了有限元动力时程分析。计算模型中,桩体、桩间土、垫层、基础采用简化的线弹性模型,分别定义材料类型;上部结构采用弯矩曲率梁算法进行计算;在边界设置黏性边界模拟无限域中的动力人工边界。通过数值计算研究了不同桩体刚度对自由场地加固区地表和非加固区地表位移峰值和加速度峰值和桩身所受到的弯矩及剪力的影响;研究了上部结构在不同垫层性质(不同刚度和不同厚度)作用下的动力反应,从而得出垫层的合理设置,为复合地基设计施工提供依据。
The composite foundations are getting more and more application to construction engineering.However,the research on their seismic behavior under dynamic loading,especially under seismic loading,is quite limited.Now,the seismic response analysis in the time domain is performed with ADINA program,considering the interactions among foundation,footing and superstructure.The influence of earth surface peak acceleration,displacement and pile moment,shearing force under different pile body moduli,the influence of peak moment and accumulated plastic curvature of superstructure under different bedding cushion characters(different moduli,different depths),are analyzed.Based on these analyses,some conclusions which may be useful for seismic design of this type composite foundation are drawn.
The composite foundations are getting more and more application to construction engineering.However,the research on their seismic behavior under dynamic loading,especially under seismic loading,is quite limited.Now,the seismic response analysis in the time domain is performed with ADINA program,considering the interactions among foundation,footing and superstructure.The influence of earth surface peak acceleration,displacement and pile moment,shearing force under different pile body moduli,the influence of peak moment and accumulated plastic curvature of superstructure under different bedding cushion characters(different moduli,different depths),are analyzed.Based on these analyses,some conclusions which may be useful for seismic design of this type composite foundation are drawn.
引文
[1]李宁,韩煊.褥垫层对复合地基承载机理的影响[J].土木工程学报,2001,34(2):68-83.
[2]宋二祥.无限地基数值模拟的传输边界[J].工程力学,1997,(增刊):613-619.
[3]王松涛,曹资.现代抗震设计方法[M].北京:中国建筑工业出版社,1997.
[4]鲍鹏,姜忻良,盛桂琳.劲性搅拌桩复合地基承载性能静动力分析[J].岩土力学,2007,28(1):63-68,82.
[5]杨志华,杨庆,孔纲强,等.水泥土搅拌桩复合地基震动性能时程分析[J].岩土力学,2008,29(3):63-68.
[6]张建民,张噶.土体与结构物动力相互作用研究进展[J].岩石力学与工程学报,2001,20(增1):854-865.
[7]梁旭.水泥搅拌桩复合地基动力特性及其与上部结构动力作用研究[博士学位论文D].大连:大连理工大学,2003.
[8]王伟,杨尧志.水泥粉煤灰碎石桩复合地基抗震性能分析[J].世界地震工程,2000,16(2):97-100.
[9]徐志国,宋二祥.刚性桩复合地基抗震性能的有限元分析[J].岩土力学,2004,25(2):179-184.
[10]王立忠,柯瀚,陈云敏,等.地震荷载作用下水泥搅拌桩的动力响应[J].振动工程学报,1998,11(4):416-423.
[2]宋二祥.无限地基数值模拟的传输边界[J].工程力学,1997,(增刊):613-619.
[3]王松涛,曹资.现代抗震设计方法[M].北京:中国建筑工业出版社,1997.
[4]鲍鹏,姜忻良,盛桂琳.劲性搅拌桩复合地基承载性能静动力分析[J].岩土力学,2007,28(1):63-68,82.
[5]杨志华,杨庆,孔纲强,等.水泥土搅拌桩复合地基震动性能时程分析[J].岩土力学,2008,29(3):63-68.
[6]张建民,张噶.土体与结构物动力相互作用研究进展[J].岩石力学与工程学报,2001,20(增1):854-865.
[7]梁旭.水泥搅拌桩复合地基动力特性及其与上部结构动力作用研究[博士学位论文D].大连:大连理工大学,2003.
[8]王伟,杨尧志.水泥粉煤灰碎石桩复合地基抗震性能分析[J].世界地震工程,2000,16(2):97-100.
[9]徐志国,宋二祥.刚性桩复合地基抗震性能的有限元分析[J].岩土力学,2004,25(2):179-184.
[10]王立忠,柯瀚,陈云敏,等.地震荷载作用下水泥搅拌桩的动力响应[J].振动工程学报,1998,11(4):416-423.
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