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1、第29卷第1期土木工程與管理學報Vo1.29No.12012年3月JournalofCivilEngineeringandManagementMar.2012預制混凝土拱涵地震響應分析潘玉濤,鄭俊杰,馬強,母進偉(1.黃土地區(qū)公路建設與養(yǎng)護技術交通行業(yè)重點實驗室,山西太原030006;2.華中科技大學土木工程與力學學院,湖北武漢430074;3.貴州省公路工程集團總公司,貴州貴陽550008)摘要:首先建立拱涵二維有限差分模型,對拱涵的安裝與路堤的填筑過程進行模擬,并得到拱涵與填土體系受力的初始狀態(tài);然后對拱涵進行時程分析,探究拱涵在地震作
2、用下的位移與應力響應規(guī)律;最后著重論述填土高度、地震加速度以及地震波傳播角度對拱涵地震動力響應的影響,并分析混凝土預制拱涵在地震作用下的薄弱位置。結果表明:隨著填土高度的增加,拱頂與基底之間水平相對位移逐漸增大,拱涵各個接觸面的內力在靜態(tài)內力的基礎上顯著非線性增大;拱涵的各個接觸面的內力對峰值加速度的改變較敏感;隨著地震波傳播角度的增大,拱頂與基底水平相對位移將減小,拱涵的內力響應也逐漸減小。關鍵詞:預制拱涵;地震響應;填土高度;峰值加速度;地震波傳播角度中圖分類號:U449.84文獻標識碼:A文章編號:2095-0985(2012)01-
3、0030-05AnalysisonSeismicResponsesofPrecastConcreteArchCulvertPANYu—tao,ZHENGJun-jie,MAQiang,MUfin—wei。(1.KeyLaboratoryofHighwayConstructionandMaintenanceTechnologyinLoessRegion,MinistryofTransport,Taiyuan030006,China;2.SchoolofCivilEngineeringandMechanics,HuazhongUniversit
4、yofScienceandTechnology,Wuhan430074,China;3.GuizhouHighwayEngineeringGroupCoLtd,Guiyang550008,China)Abstract:Atwo-dimensionalfinitedifferencemodelisfirstlyestablished,andtheprocessofinstallationoftheprecastarchculvertissimulatedtoobtaintheinitialstateofarchculvert.Timehist
5、oryanalysisisthenperformedtofindtheresponselawsofdisplacementandstressresultantsofculvertstructures.Finally,awiderangeofparametricstudiesarecarriedouttoinvestigatetheinfluenceofheightoffill,peakgroundaccelerationandthepropagationangleofseismicwaveontheresponsesofarchculver
6、tsunderseismicloads.Anotherimportanttaskistofindoutthemostvulnerablecomponentsorinterfacesofthewholeprecastculvert.Theresultsshowthatthelateralrelativedisplacementbetweenthearchcrownandthefoundationbase,andthepeakvaluesofinternalforcesunderseismicloadsinereaseconsiderablya
7、ndnonlinearlyastheheightoffil1increases.Thepeakvaluesofinternalforcesaresensitivetotheminorvariationsofpeakgroundacceleration.Boththelateralrelativedisplacementbetweenthearchcrownandthefoundationbaseandtheresponsesofstressresultantsofculvertstructuredecreasewhenthepropagat
8、ionangleofseismicwaveincreases.Keywords:precastarchculvert;seismicresponse;heightof6U;pea