单柱墩拟静力试验仿真计算案例
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摘要
在地震荷载作用下,钢筋混凝土桥墩是最易破坏的桥梁构件,如何较可靠地模拟钢筋混凝土桥墩在循环荷载作用下的非线性滞回反应是桥梁结构抗震研究的重要内容。以呈弯曲破坏形态的钢筋混凝土桥墩的拟静力试验结果为依据,基于OpenSees中的Beamwith Hinges Element单元,分别建立了圆形墩和矩形墩的滞回分析纤维单元模型。由计算结果与试验结果对比可知,所建立的纤维单元模型对桥墩的骨架曲线及滞回曲线都有良好的模拟效果,且能体现桥墩在反复加载过程中刚度、强度退化现象。
Reinforced concrete bridge pier is the most easily destroyed bridge member under seismic loading,how to reliably simulate nonlinear hysteretic response of reinforced concrete bridge pier under cyclic loading is an important content in seismic resistance of bridge structure research field.Based on the pseudo-static test of RC bridge piers which have flexural failures,the BeamwithHingesElement in OpenSees program was used to model the hysteretic behaviors of circular sectional and rectangular sectional bridge piers subjected to cyclic loading.The comparison between the computation result and the experiment result shows that the established fiber element model can accurately simulate the backbone curves,hysteretic curves of the piers and can also reflect the degradation of stiffness and strength in the process of cyclic loading.
Reinforced concrete bridge pier is the most easily destroyed bridge member under seismic loading,how to reliably simulate nonlinear hysteretic response of reinforced concrete bridge pier under cyclic loading is an important content in seismic resistance of bridge structure research field.Based on the pseudo-static test of RC bridge piers which have flexural failures,the BeamwithHingesElement in OpenSees program was used to model the hysteretic behaviors of circular sectional and rectangular sectional bridge piers subjected to cyclic loading.The comparison between the computation result and the experiment result shows that the established fiber element model can accurately simulate the backbone curves,hysteretic curves of the piers and can also reflect the degradation of stiffness and strength in the process of cyclic loading.
引文
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[2]MAZZONI S,MCKENNA F,FENVES G L,et al.Open Systemfor Earthquake Engineering Simulation User Manual[OL].[2009-10-30].http://www.opensees.berkeley.edu.
[3]ELWOOD K J.Shake Table Tests and Analytical Studies on theGravity Load Collapse of RC Frames[D].Berkeley:Depart-ment of Civil and Environmental Engineering,University ofCalifornia,2002.
[4]YANG Zhaohui,ELGAMAL A.Command Manual and UserReference for OpenSees Soil Models and Fully Coupled Element[R].San Diego:University of California,2003.
[5]BERRY M,PARISH M,EBERHARD M O.PEER StructuralPerformance Database[R].Berkeley,CA:Pacific Earth-quake Engineering Research Center,2004
[6]LEHMAN D E,MOEHLE J P.Seismic Performance of Well-Confined Concrete Bridge Columns,PEER 1998/01[R].Berkeley,CA:Pacific Earthquake Engineering Research Cen-ter,2000.
[7]重庆交通科研设计院.墩柱模型抗震性能试验研究报告[D].重庆:重庆交通科研设计院,2006.Chongqing Communications Research&Design Institute Co.,Ltd.[D].Chongqing:Chongqing Communications Research&Design Institute Co.,Ltd.,2006.
[8]中华人民共和国交通运输部.JTG/T B02-01-2008公路桥梁抗震设计细则[S].北京.人民交通出版社,2008.P.R.China.Ministry of Transport.JTG/T B02-01-008 Guidelinsefor Seismic Design of Highway Bridges[S].Beijing:ChinaCommunications Press,2008.
[9]KENT D C,PARK R.Flexural Members with Confined-Con-crete[J].Journal of the Structural Division,1971,97(7):1969-1990.
[10]CHANG G A,MANDER J B.Seismic Energy Based FatigueDamage Analysis of Bridge Columns:Part I Evaluation of Seis-mic Capacity,NCEER Technical Report.94-0006[R].Buffalo,NewYork:National Center for Earthquake Engineer-ing Research,1994.
[11]BERRY M P,EBERHARD M O.Performance ModelingStrategies for Modern Reinforced Concrete Bridge Columns[R].Berkeley:University of California,2008.
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