分离式高桩基础承台抗震性能分析
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摘要
通过分析现有高桩承台体系的缺点入手,引入摇摆抗震技术,提出了分离式承台系统,介绍了该体系的基本特性,并从该体系的主要力学特点出发,采用SAP2000有限元分析软件建立了开放式与限位式两种分离式承台数值模型,在分析该模型的可行性之后,在此基础上建立了简支桥梁模型,分析了几项主要的动力响应,包括墩底弯矩、边桩拔出力、墩顶位移以及承台抬起高度,最后分析了该体系的优势以及未来需要进一步研究的方向。
In this paper,a separated pile-cap foundation design was presented by introducing rocking system into the existing techniques.Two finite elements models of the separated pile-cap foundation,the free cap and the controlled cap,were built with SAP2000 after the introduction of basic mechanical properties of the system.After a feasibility study,the simple supported beam models were constructed by using the separated pilecap foundation.Main behaviors of the system under an artificial seismic wave were investigated based on nonlinear time-history analyses.At the end of the paper,the advantages and potentials of the system were discussed.
In this paper,a separated pile-cap foundation design was presented by introducing rocking system into the existing techniques.Two finite elements models of the separated pile-cap foundation,the free cap and the controlled cap,were built with SAP2000 after the introduction of basic mechanical properties of the system.After a feasibility study,the simple supported beam models were constructed by using the separated pilecap foundation.Main behaviors of the system under an artificial seismic wave were investigated based on nonlinear time-history analyses.At the end of the paper,the advantages and potentials of the system were discussed.
引文
[1]高永.大型桥梁高桩承台群桩基础抗震能力研究[D].上海:同济大学,2012.Gao Yong.Seismic research of pile-cap bridge with pile-group foundation[D].Shanghai:Tongji University,2012.(in Chinese)
[2]周敉.高桩承台桥梁抗震性能试验和理论研究[D].上海:同济大学,2012.Zhou Mei.Seismic test and theoretical research of pile-cap bridge[D].Shanghai:Tongji University,2012.(in Chinese).
[3]刘伟岸.大型高桩承台基础的地震反应分析[D].上海:同济大学,2012.Liu Wei’an.Seismic response analysis of pile-cap foundation[D].Shanghai:Tongji University,2012.(in Chinese).
[4]Housner G W.The behavior of inverted pendulum structures during earthquakes[J].Bulletin of the Seismological Society of America,1963,53(2):403417.
[5]孙飞飞,曹鹄.自回复跷动减震结构地震反应分析[J].土木工程学报,2010,43:411-422.Sun Feifei,Cao Hu.Seismic response analysis of self-centering rocking aseismic structures[J].China Civil Engineering Journal,2010,43:411-422.(in Chinese)
[6]夏修身,陈兴冲.桩基础桥墩摇摆隔震研究[J].振动与冲击.2011,30(S):28-31.Xia Xiushen,Chen Xingchong.Analysis controlled rocking of bridge pier with pile foundations[J].Journal of Vibration and Shock,2011,30(S):28-31.(in Chinese)
[7]Cheng C T.Shaking table tests of a self-centering designed bridge substructure[J].Engineering Structures,2008,30(12):3426-3433.
[8]Marriott D,Pampanin S,Palerm A.Biaxial testing of unbonded post-tensioned rocking bridge piers with external replacable dissipators[J].Earthquake Engineering and Structure Dynamics,2011,40:17231741.
[9]Mergos P E,Kawashima K.Rocking isolation of a typical bridge pier on spread foundation[J].Journal of Earthquake Engineering,2005,9(2):395-414.
[10]王立忠.提离式桩基础抗震性能拟静力试验研究[D].上海:同济大学,2012.Wang Lizhong.Pseudo-static test on seismic performance of pile group foundation with uplift[D].Shanghai:Tongji University,2012.(in Chinese)
[2]周敉.高桩承台桥梁抗震性能试验和理论研究[D].上海:同济大学,2012.Zhou Mei.Seismic test and theoretical research of pile-cap bridge[D].Shanghai:Tongji University,2012.(in Chinese).
[3]刘伟岸.大型高桩承台基础的地震反应分析[D].上海:同济大学,2012.Liu Wei’an.Seismic response analysis of pile-cap foundation[D].Shanghai:Tongji University,2012.(in Chinese).
[4]Housner G W.The behavior of inverted pendulum structures during earthquakes[J].Bulletin of the Seismological Society of America,1963,53(2):403417.
[5]孙飞飞,曹鹄.自回复跷动减震结构地震反应分析[J].土木工程学报,2010,43:411-422.Sun Feifei,Cao Hu.Seismic response analysis of self-centering rocking aseismic structures[J].China Civil Engineering Journal,2010,43:411-422.(in Chinese)
[6]夏修身,陈兴冲.桩基础桥墩摇摆隔震研究[J].振动与冲击.2011,30(S):28-31.Xia Xiushen,Chen Xingchong.Analysis controlled rocking of bridge pier with pile foundations[J].Journal of Vibration and Shock,2011,30(S):28-31.(in Chinese)
[7]Cheng C T.Shaking table tests of a self-centering designed bridge substructure[J].Engineering Structures,2008,30(12):3426-3433.
[8]Marriott D,Pampanin S,Palerm A.Biaxial testing of unbonded post-tensioned rocking bridge piers with external replacable dissipators[J].Earthquake Engineering and Structure Dynamics,2011,40:17231741.
[9]Mergos P E,Kawashima K.Rocking isolation of a typical bridge pier on spread foundation[J].Journal of Earthquake Engineering,2005,9(2):395-414.
[10]王立忠.提离式桩基础抗震性能拟静力试验研究[D].上海:同济大学,2012.Wang Lizhong.Pseudo-static test on seismic performance of pile group foundation with uplift[D].Shanghai:Tongji University,2012.(in Chinese)
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