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时间:2020-03-27
《有初始转角的隔震支座在不同方向地震水平力作用下的力学性能研究.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第34卷第4期建筑科学与工程学报Vol.34No.42017年7月JournalofArchitectureandCivilEngineeringJuly2017文章编号:1673‐2049(2017)04‐0041‐07有初始转角的隔震支座在不同方向地震水平力作用下的力学性能研究112徐忠根,朱祥盛,邓长根(1.广州大学土木工程学院,广东广州510006;2.同济大学建筑工程系,上海200092)摘要:为了研究大跨度空间结构支座转动问题,对上下表面发生相对转动的橡胶隔震支座水平力学性能进行了研究。运用有限元分析软件ABAQUS研究了支座无初始转角时的水平性
2、能,分析了有初始转角橡胶隔震支座在X向、Y向和45°向水平位移加载下的支座水平力学性能,得出了水平刚度与剪应变之间的变化关系。结果表明:X向和45°向水平位移加载时,在小剪应变下,支座水平刚度随初始转角的增大而减小,之后随初始转角的增大而增大;Y向水平位移加载下,在大剪应变之前,水平刚度随初始转角的增大而减小,之后随初始转角增大而增大;与无初始转角相比,有初始转角的橡胶隔震支座水平刚度较大,使得其在地震设防烈度下的隔震效果较差;在工程受力范围内,3种不同水平位移加载下,竖向压力的变化对水平刚度的影响较小。关键词:大跨度空间结构;橡胶隔震支座;初始转角;水平刚
3、度;设防烈度中图分类号:TU352.1文献标志码:AResearchonMechanicalPropertiesofRubberBearingswithInitialRotationUnderHorizontalSeismicForcesinDifferentDirections112XUZhong‐gen,ZHUXiang‐sheng,DENGChang‐gen(1.SchoolofCivilEngineering,GuangzhouUniversity,Guangzhou510006,Guangdong,China;2.DepartmentofStruc
4、turalEngineering,TongjiUniversity,Shanghai200092,China)Abstract:Inordertoanalyzethebearingrotationoflarge‐spanspatialstructures,thehorizontalmechanicalpropertiesoftherubberbearingswithrelativerotationbetweenupperandlowerfaceswerestudied.ThefiniteelementsoftwareABAQUSwasusedtoanalyz
5、ethehorizontalmechanicalpropertiesofrubberbearingswithoutinitialrotation.ThenthehorizontalmechanicalpropertiesofrubberbearingswithinitialrotationwereanalyzedwhenthehorizontaldisplacementloadinginXdirection,Ydirectionand45°direction.Finally,thevaryingtrendsofhorizontalstiffnessandsh
6、earstrainswereobtained.Theresultsshowthatwhenshearstrainsaresmall,thehorizontalstiffnessofbearingsdecreaseswiththeincreasesoftherotationatfirst,andthenincreasesatXdirectionand45°direction.Whenshearstrainsarelarge,thehorizontalstiffnessdecreaseswiththeincreasesoftherotationangleatfi
7、rst,andthenincreasesatYdirection.Comparingwithrubberbearingswithoutinitialrotation,thehorizontalstiffnessoftherubberbearingswithinitialrotationislarger,whichmakestheseismicisolationeffectunderseismicfortificationintensityworse.Intherangeofengineeringstress,theverticalpressureshavel
8、ittle收稿日期:2017‐02‐12基金项目:国
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