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1、第29卷第1期土木工程與管理學(xué)報(bào)Vo1.29No.12012年3月JournalofCivilEngineeringandManagementMar.2012預(yù)制混凝土拱涵地震響應(yīng)分析潘玉濤,鄭俊杰,馬強(qiáng),母進(jìn)偉(1.黃土地區(qū)公路建設(shè)與養(yǎng)護(hù)技術(shù)交通行業(yè)重點(diǎn)實(shí)驗(yàn)室,山西太原030006;2.華中科技大學(xué)土木工程與力學(xué)學(xué)院,湖北武漢430074;3.貴州省公路工程集團(tuán)總公司,貴州貴陽(yáng)550008)摘要:首先建立拱涵二維有限差分模型,對(duì)拱涵的安裝與路堤的填筑過程進(jìn)行模擬,并得到拱涵與填土體系受力的初始狀態(tài);然后對(duì)拱涵進(jìn)行時(shí)程分析,探究拱涵在地震作
2、用下的位移與應(yīng)力響應(yīng)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(duì)拱涵地震動(dòng)力響應(yīng)的影響,并分析混凝土預(yù)制拱涵在地震作用下的薄弱位置。結(jié)果表明:隨著填土高度的增加,拱頂與基底之間水平相對(duì)位移逐漸增大,拱涵各個(gè)接觸面的內(nèi)力在靜態(tài)內(nèi)力的基礎(chǔ)上顯著非線性增大;拱涵的各個(gè)接觸面的內(nèi)力對(duì)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(duì)位移將減小,拱涵的內(nèi)力響應(yīng)也逐漸減小。關(guān)鍵詞:預(yù)制拱涵;地震響應(yīng);填土高度;峰值加速度;地震波傳播角度中圖分類號(hào):U449.84文獻(xiàn)標(biāo)識(shí)碼:A文章編號(hào):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