曲线PC箱梁桥隔震体系的非线性分析
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摘要
为了改善曲线PC箱梁桥的抗震性能,基于空间有限元法,采用非线性弹簧单元模拟铅芯橡胶支座,考虑了减隔震支座的非线性特性,以一座三跨曲线PC连续箱梁桥为例,分别对设置板式橡胶支座及铅芯橡胶支座的结构体系进行了非线性动力时程地震响应分析,并研究了铅芯橡胶支座在曲线梁桥中的减隔震效果。分析结果表明:铅芯橡胶支座具有很好的减隔震效果,能显著降低下部结构的地震响应值;多维地震荷载作用下,曲线箱梁桥的受力更为不利。
In order to improve seismic performance of curved box girder bridge,based on spatial finite element method,nonlinear spring element was used to simulate the lead-rubber bearing(LRB) considering its nonlinear properties.Taking a three-span curved PC box girder bridge as example,nonlinear time-history seismic response analyses were carried out respectively for bridge with plate rubber bearing and bridge with LRB structural systems.The effects of LRB in mitigating and isolating the seismic force for curved bridge were studied. The analysis results show that the LRB is quite effective as it can reduce the seismic response of substructures to great extent.Moreover,multi-dimensional earthquake excitation is more serious case for curved box girder bridge.
In order to improve seismic performance of curved box girder bridge,based on spatial finite element method,nonlinear spring element was used to simulate the lead-rubber bearing(LRB) considering its nonlinear properties.Taking a three-span curved PC box girder bridge as example,nonlinear time-history seismic response analyses were carried out respectively for bridge with plate rubber bearing and bridge with LRB structural systems.The effects of LRB in mitigating and isolating the seismic force for curved bridge were studied. The analysis results show that the LRB is quite effective as it can reduce the seismic response of substructures to great extent.Moreover,multi-dimensional earthquake excitation is more serious case for curved box girder bridge.
引文
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[2]单修政,徐世芳.高架路桥的震害、震害原因及抗震措施[J].灾害学,2000,15(4):55-60.SHAN Xiu-zheng,XU Shi-fang.Earthquake Damageto Overhead Roads and Viaducts and Their Cause andCountermeasures[J].Journal of Catastrophology,2000,15(4):55-60.
[3]TURKINGTON D H,CARR A J,COOKE N,et al.Design Method for Bridges on Lead-rubber Bearings[J].Journal of Structural Engineering,1989,115(12):3 001-3 033.
[4]刘健新,胡兆同,李子青.桥梁结构减震设计方法研究[J].中国公路学报,2000,13(2):73-79.LIU Jian-xin,HU Zhao-tong,LI Zi-qing.DesignMethod for Seismic Absorption of Bridges Structures[J].China Journal of Highway and Transport,2000,13(2):73-79.
[5]SHEN J,TSAI M H,CHANG K C,et al.Perform-ance of a Seismically Isolated Bridge Under Near-faultEarthquake Ground Motions[J].Journal of StructuralEngineering,2004,130(6):861-868.
[6]刘健新,胡兆同.公路桥梁减震装置及设计方法研究[R].西安:长安大学,2000.LIU Jian-xin,HU Zhao-tong.Study on Shock Attenu-ation Device and Design Method of Highway Bridge[R].Xi an:Chang an University,2000.
[7]范立础,王志强.大跨度桥梁隔震设计[M].北京:人民交通出版社,2001.FAN Li-chu,WANG Zhi-qiang.Seismic Isolation De-sign of Large Span Bridges[M].Beijing:China Com-munications Press,2001.
[8]JANGID R S.Seismic Response of Isolated Bridges[J].Journal of Bridge Engineering,2004,9(2):156-166.
[9]王丽,阎贵平,孙立.LRB隔震桥梁减震效果分析[J].工程力学,2003,20(5):124-129.WANG Li,YAN Gui-ping,SUN Li.Analysis of Seis-mic Response of Isolated Bridges with LRB[J].Engi-neering Mechanics,2003,20(5):124-129.
[10]AASHTO.Guide Specifications for Seismic IsolationDesign[M].Washington DC:AASHTO,1998.
[11]宋一凡,贺拴海,曹继伟.基于能量原理的框架桥墩地震力分析[J].长安大学学报:自然科学版,2002,22(1):36-40.SONG Yi-fan,HE Shuan-hai,CAO Ji-wei.Analysisfor Transverse Seismic Forces of the Frame BridgePiers Based on Energy Principle[J].Journal ofChang an University:Natural Science Edition,2002,22(1):36-40.
[12]刘健新,张伟,张茜.洛河特大桥抗震性能计算[J].交通运输工程学报,2006,6(1):57-62.LIU Jian-xin,ZHANG Wei,ZHANG Qian.Anti-seis-mic Performance Calculation of Luohe Bridge[J].Journal of Traffic and Transportation Engineering,2006,6(1):57-62.
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