大港滩海地区桶形基础平台地震响应分析
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摘要
按照平台设计尺寸,建立以平台板、导管架和桶体为一整体的三维有限元计算模型,考虑桶-土-结构相互作用,用弹簧-阻尼体系模拟软基的动力特性。不考虑外力的作用,确定桶形基础平台的自振特性。进而,输入天津波的动加速度时程曲线,对平台板、导管架和桶体的位移时程响应进行分析。结果表明,桶形基础平台中不同构件沿X方向的位移时程响应是不同的,以平台板响应最为明显,平台板角点沿X方向最大位移量为10cm;而平台板、导管架和桶体沿Y方向的位移时程响应很一致,桶形基础平台中不同构件沿Y方向最大位移量均小于1cm。
Three-dimensional finite element numerical model has been built according to design dimension of bucket foundation platform,considering platform board,conductor pipe shelf and bucket foundation well contact each other.And the dynamic character of soft clay foundation has been simulated with spring-damp system considering the interaction of bucket and soft clay foundation as well as superstructure.Natural vibration character has been determined without regard for external force action.Further,the displacement response of platform board and conductor pipe shelf as well as bucket foundation has been analyzed carrying in acceleration temporal curves of TINJING waves.Several conclusions can be obtained.Different component of platform structure has different displacement temporal response along X direction.The displacement response of platform board angular point is obvious and the maximum displacement along X direction is 10cm.At the same time,the displacement response along Y direction of platform board and conductor pipe shelf as well as bucket foundation has a good concordance.Furthermore,the maximum displacement along Y direction of different component of platform structure is all less than 1cm.
Three-dimensional finite element numerical model has been built according to design dimension of bucket foundation platform,considering platform board,conductor pipe shelf and bucket foundation well contact each other.And the dynamic character of soft clay foundation has been simulated with spring-damp system considering the interaction of bucket and soft clay foundation as well as superstructure.Natural vibration character has been determined without regard for external force action.Further,the displacement response of platform board and conductor pipe shelf as well as bucket foundation has been analyzed carrying in acceleration temporal curves of TINJING waves.Several conclusions can be obtained.Different component of platform structure has different displacement temporal response along X direction.The displacement response of platform board angular point is obvious and the maximum displacement along X direction is 10cm.At the same time,the displacement response along Y direction of platform board and conductor pipe shelf as well as bucket foundation has a good concordance.Furthermore,the maximum displacement along Y direction of different component of platform structure is all less than 1cm.
引文
[1]Sherif EI-Gharbawy.Suction Cassion in Soft Clay,The 18th International Conference on Offshore Mechanics and ArcticEngineering,1999,OFT-4063
[2]吴海滨,朱世强,陈鹰.桶形基础平台沉浮过程稳定性分析[J].浙江大学学报,2001.11
[3]Wang Jian-hua,Liu Yuanfeng,Xing Yan.Estimation of undrained bearing capacity for offshore soft foundation withcyclic loads[J],China Ocean Engineering,1998,12(5):213~222.
[4]Wang Jianhua,Li Chi and Kathryn Moran.Cyclic Undrained Behavior of Soft Clays and Cyclic Bearing Capacity of A SingleBucket Foundation[C].Proceeding of the Fifteenth(2005)International Offshore and Polar Engineering Conference,2005,Vol2:392-399
[5]李驰,王建华,刘振纹.软土地基单桶基础循环承载力研究[J].岩土工程学报,2005,27(9):1040~1044
[6]张之颖,吕西林,楼梦麟.软基SSI体系动力特性研究-一阶模态化趋势[J].岩石力学与工程学报,2004,23(9):1502~1508
[7]王凤霞,何政,欧进萍,桩-土-结构动力相互作用的线弹性地震反应分析[J].世界地震工程,2003,19(2):58~66
[8]王建华,软土地基弹塑性地震响应分析[J].振动工程学报,1995,8(4):317~323
[9]张伟,周锡祍,余建星.滩海桶形基础平台整体模态计算[J].海洋技术,2004,23(1):57~61
[10]建筑科学研究院.建筑抗震设计规范[S][GB50011-2001].建筑工业出版社,2001.7
[2]吴海滨,朱世强,陈鹰.桶形基础平台沉浮过程稳定性分析[J].浙江大学学报,2001.11
[3]Wang Jian-hua,Liu Yuanfeng,Xing Yan.Estimation of undrained bearing capacity for offshore soft foundation withcyclic loads[J],China Ocean Engineering,1998,12(5):213~222.
[4]Wang Jianhua,Li Chi and Kathryn Moran.Cyclic Undrained Behavior of Soft Clays and Cyclic Bearing Capacity of A SingleBucket Foundation[C].Proceeding of the Fifteenth(2005)International Offshore and Polar Engineering Conference,2005,Vol2:392-399
[5]李驰,王建华,刘振纹.软土地基单桶基础循环承载力研究[J].岩土工程学报,2005,27(9):1040~1044
[6]张之颖,吕西林,楼梦麟.软基SSI体系动力特性研究-一阶模态化趋势[J].岩石力学与工程学报,2004,23(9):1502~1508
[7]王凤霞,何政,欧进萍,桩-土-结构动力相互作用的线弹性地震反应分析[J].世界地震工程,2003,19(2):58~66
[8]王建华,软土地基弹塑性地震响应分析[J].振动工程学报,1995,8(4):317~323
[9]张伟,周锡祍,余建星.滩海桶形基础平台整体模态计算[J].海洋技术,2004,23(1):57~61
[10]建筑科学研究院.建筑抗震设计规范[S][GB50011-2001].建筑工业出版社,2001.7
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