大型梁式渡槽采用摩擦摆支座的减隔震研究
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摘要
大型梁式渡槽由于水体质量庞大,地震作用往往成为控制该类结构设计的主要因素,选用具有隔震和耗能双重功能的摩擦摆支座对大型渡槽结构进行隔震研究,分析了摩擦摆支座的隔震效果并与普通橡胶支座的隔震效果进行了对比。计算结果表明:非线性摩擦摆支座纵横向隔震能在一定程度上大幅减小墩顶位移和墩底内力,并使槽身相对于墩顶的位移控制在可接受范围内,满足结构的抗震需求。摩擦摆支座可有效地应用于大型梁式渡槽,其减、隔震性能明显优于普通橡胶支座。
Large beam aqueduct carries a huge water mass and an analysis of earthquake action on it is always crucial to its structure design.This work studied seismic isolation of large aqueducts with friction pendulum bearings(FPBs) of dual functions,seismic isolation and energy dissipation,focusing on the isolation effect of these bearings and comparing them with ordinary rubber bearings.The results show that FPBs have a significant isolation effect due to their nonlinear behaviors,and that their longitudinal and lateral isolation causes a great reduction in both the displacement at the pier top and the internal stress at the pier bottom.As a result,it becomes easier to control the displacement of aqueduct body relative the pier top within an acceptable range so as to meet the seismic resistance goal of structure design.Thus,FPBs that are applicable to large-size aqueduct structure,are superior to ordinary rubber bearings in reducing and isolating earthquake action.
Large beam aqueduct carries a huge water mass and an analysis of earthquake action on it is always crucial to its structure design.This work studied seismic isolation of large aqueducts with friction pendulum bearings(FPBs) of dual functions,seismic isolation and energy dissipation,focusing on the isolation effect of these bearings and comparing them with ordinary rubber bearings.The results show that FPBs have a significant isolation effect due to their nonlinear behaviors,and that their longitudinal and lateral isolation causes a great reduction in both the displacement at the pier top and the internal stress at the pier bottom.As a result,it becomes easier to control the displacement of aqueduct body relative the pier top within an acceptable range so as to meet the seismic resistance goal of structure design.Thus,FPBs that are applicable to large-size aqueduct structure,are superior to ordinary rubber bearings in reducing and isolating earthquake action.
引文
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[8]季日臣,夏修身,陈尧隆.水体晃荡作用对渡槽横向抗震影响的研究[J].水力发电学报,2007,26(6):80-84.JI Richen,XIA Xiushen,CHEN Yiaolong.Research on influence of water shake acting on aqueduct transverse seismic response[J].Journal of Hydroelectric Engineering.2007,26(6):30-34.(in Chinese)
[2]徐建国,陈淮,王博.渡槽结构非线性隔震研究[J].长江科学院院报,2008,25(2):61-68.XU Jianguo,CHEN Huai,WANG Bo.Nonlinear vibration isolation study of aqueduct structure[J].Journal of Yangtze RiverScientific Research Institute,2008,25(2):61-68.(in Chinese)
[3]杨世浩,李正农,宋一乐,等.大型渡槽支座隔震研究[J].振动工程学报,2009,22(2):188-192.YANG Shihao,LI Zhengnong,SONG Yile,et al.Seismic isolation of large aqueduct by using seismic isolation bearing[J].Journalof Vibration Engineering,2009,22(2):188-192.(in Chinese)
[4]范立础,王志强.我国桥梁隔震技术的应用[J].振动工程学报,1999,12(2):173-181.FAN Lichu,WANG Zhiqiang.The application of bridge isolation technology[J].Journal of Vibration Engineering,1999,12(2):173-181.(in Chinese)
[5]中华人民共和国电力工业部.(DL5073-1997)水工建筑物抗震设计规范[S].北京:中国电力出版社,1997.Ministry of Electric Power Industry of the People’s Republic of China.Specification for seismic design of hydraulicstructures(DL5073-1997)[S].Beijing:China Electric Pouler Press,1997.(in Chinese)
[6]陈玲玲,钱胜国,陈敏中,等.大型渡槽减隔震机理与效用分析[J].长江科学院院报,2005,22(5):70-73.CHEN Lingling,QIAN Shengguo,CHEN Minzhong,et al.Large aqueduct isolation mechanism and the utility analysis[J].Journalof Yangtze River Scientific Research Institute,2005,22(5):70-73.(in Chinese)
[7]居荣初,曾心传.弹性结构与液体的耦联振动理论[M].北京:地震出版社,1983.JU Rongchu,ZENG Xinchuan.The coupled vibration theory of elastic structure and fluid[M].Beijing,The Earthquake Press.1983.(in Chinese)
[8]季日臣,夏修身,陈尧隆.水体晃荡作用对渡槽横向抗震影响的研究[J].水力发电学报,2007,26(6):80-84.JI Richen,XIA Xiushen,CHEN Yiaolong.Research on influence of water shake acting on aqueduct transverse seismic response[J].Journal of Hydroelectric Engineering.2007,26(6):30-34.(in Chinese)
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