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1、第32卷第3期公路交通科技V01.32No.32015年3月‘JoumalofHighwayandTmnsportationResearchaIldDevelopmentMar.2015doi:10.3969/j.issn.1002—0268.2015.03.013活動支座狀態(tài)對橋梁彈塑性地震反應(yīng)的影響王常峰1,包儀軍2,陳興沖2,丁明波2(1.煙臺大學(xué)土木工程學(xué)院,山東煙臺264005;2.蘭州交通大學(xué)土木工程學(xué)院,甘肅蘭州730070)摘要:為研究活動支座的不同狀態(tài)對橋梁結(jié)構(gòu)彈塑性地震反應(yīng)的影響,根據(jù)地震中活動
2、支座的3種不同狀態(tài)分析了其對應(yīng)的有限單元模型;利用間隙單元和鉤單元的組合構(gòu)造了活動范圍受限情況下的活動支座有限單元模型;采用活動支座的3種單元模型,考慮不同配筋率情況下的橋墩非線性建立了連續(xù)梁橋的3種全橋有限元模型,進(jìn)行了非線性時(shí)程反應(yīng)分析。結(jié)果表明,在活動支座活動范圍受限甚至失去滑動能力的情況下,活動支座墩承擔(dān)的地震作用增大,尤其在配筋率較低的情況下其墩底最大曲率達(dá)到甚至超出了固定支座墩的曲率,地震中活動支座墩也有可能發(fā)生破壞。在橋梁抗震設(shè)計(jì)中應(yīng)根據(jù)支座的工作狀態(tài)精確模擬其作用,并考慮其可能產(chǎn)生的破壞對活動支座墩
3、產(chǎn)生的不利影響。關(guān)鍵詞:橋梁工程;活動支座狀態(tài);非線性時(shí)程分析;彈塑性地震反應(yīng);支座破壞;抗震設(shè)計(jì)中圖分類號:u442.5文獻(xiàn)標(biāo)識碼:A文章編號:1002—0268(2015)03—0075一07Effect0fStateOfMOVabIeSuppOrtOnEIastO—plasticSeismicRespOnseOfBrIdgesWANGChang.fen91,BAOYi_jun2,CHENXing—chon92,DINGMing_b02(1.SchoolofCivilEn西neering,YantaiUnive
4、rsity,YantaiShandong264005,China;2.SchoolofcivilEn矛neering,LanzhouJiaotongUniversity,LanzhouGansu730070,China)Abstract:Tbstudytheefkctofdif艷rentworkingstatesofmovablesuppoItonelasto—plasticseismicresponseofbridgestructure,thecorrespondingfiniteelementmodelsof3
5、workingstatesofmoVablesupportareanalysed.ThefiniteelementmodelofmovablesupportwithlimitedmoVingrangeisestablishedbyacombinationofgapelementandhookelement.Basedonthe3modelsofmovablesupport,3finiteelementmodelsofthewholecontinuousgirderbridgeconsideringthenonlin
6、earityofpierswithdifkrentreinforcementratiosareestablished,andthenonlineartime.historyresponseanalysisispedb珊ed.TheresultindicatesthattheseismicactionsufkredbymovablesupportpierincreasedwhenthemoVingrangeofthemoVablesupportislimitedor10stitsslidingability,them
7、a】【imumcuⅣatureatthebottomofpiermayachieVeevenbeyondthatofthefixedpierespeciallyinlowreinforcementratio,andthemoVablesupportpiermaybedestroyed.TheefkctofthemovablesupportshouldbeaecuIatelysimulatedaccordingtoitsworkingstateinseismicdesign,andtheadverseefE色ctof
8、damageofmovablesupportonthepiershouldbetakenintoaccount.KeywOrds:bridgeengineering;stateofmoVabIesupport;nonlineartime—historyanaLlysis;elasto—plasticseismicresponse;damageofsuppor