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1、廣州大學(xué)碩士學(xué)位論文隔震連續(xù)梁橋地震響應(yīng)分析及抗震性能研究專業(yè):建筑與土木工程碩士生:李為指導(dǎo)教師:馬海濤摘要近年來,為促進(jìn)我國經(jīng)濟(jì)的快速發(fā)展,在沿海地區(qū)建設(shè)跨海大橋顯得尤為重要。跨海大橋作為生命線工程,是城市之間重要的交通樞紐,橋梁采用隔震設(shè)計(jì)能有效的減小地震災(zāi)害。為研究地震作用下隔震連續(xù)梁橋的抗震性能,本文以大連灣跨海交通工程為背景,從隔震支座力學(xué)參數(shù)分析、橋梁損傷指標(biāo)、橋梁構(gòu)件IDA分析、橋梁整體易損性分析四個(gè)方面對(duì)該工程隔震橋梁進(jìn)行抗震性能評(píng)估。所研究內(nèi)容如下:1.從隔震支座耗能率的角度,對(duì)模型中隔震
2、支座進(jìn)行力學(xué)參數(shù)優(yōu)化分析,研究支座耗能率與結(jié)構(gòu)地震響應(yīng)之間的關(guān)系,并對(duì)其規(guī)律進(jìn)行了總結(jié)。結(jié)構(gòu)地震響應(yīng)隨著支座耗能率的增加有降低的趨勢(shì),在屈重比為5%~6%范圍內(nèi),隔震支座耗能率達(dá)到較大值。對(duì)比隔震與非隔震橋梁模型地震相應(yīng),隔震率全部在60%以上,隔震效果較好。2.以橋墩截面曲率和支座剪應(yīng)變作為損傷指標(biāo),確定橋梁整體抗震性能目標(biāo),分別為輕微破壞、中等破壞、嚴(yán)重破壞、倒塌??紤]到地震動(dòng)隨機(jī)性,選取符合工程場(chǎng)地的10條天然地震動(dòng)記錄進(jìn)行增量動(dòng)力分析(IDA),對(duì)橋梁構(gòu)件失效模式進(jìn)行研究。結(jié)果表明:中間墩支座最先破壞
3、,橋墩體現(xiàn)出較好的延性。3.基于該橋梁模型IDA分析結(jié)果,通過回歸分析得到橋墩和隔震支座的概率地震需求模型。結(jié)合橋墩和隔震支座的損傷指標(biāo),得到橋梁構(gòu)件的易損性曲線,利用寬限法得到橋梁整體的易損性曲線,對(duì)該實(shí)際工程隔震橋梁整體抗震性能進(jìn)行評(píng)估。結(jié)果表明地震作用下橋梁整體的破壞概率高于構(gòu)件的破壞概率。關(guān)鍵詞:隔震橋梁;損傷指標(biāo);IDA分析;地震易損性分析;抗震性能評(píng)估I隔震連續(xù)梁橋地震響應(yīng)分析及抗震性能研究II廣州大學(xué)碩士學(xué)位論文SeismicResponseAnalysisandAntiseismicPerfo
4、rmanceofIsolatedContinuousBeamBridgesMajor:ArchitectureandCivilEngineeringName:Supervisor:AbstractInrecentyears,inordertopromotetherapideconomicdevelopmentofourcountry,itisparticularlyimportanttobuildcross-seabridgesincoastalareas.Sincethecross-seabridgeist
5、helifelineprojectandtheimportanttransportationhubbetweencities,theseismicisolationdesignofcross-seabridgescaneffectivelyreduceearthquakedisasters.Inordertostudytheseismicbehaviorofisolatedcontinuousbeambridgeunderearthquakeaction,basedonDalianBaycross-seatr
6、afficengineering,thispaperaimstomakeaseismicperformanceevaluationontheisolatedbridgefromfollowingfouraspects:theparametersofisolationbearing,thedamageindexofbridge,andtheIDAanalysisofbridgecomponents,andthevulnerabilityanalysisofthebridgesystem.Thecontentso
7、fthestudyareasfollows:Firstly,fromtheangleofbearingrateofenergyconsumption,theauthormakesananalysisonparameteroptimizationonmechanicalmodelofisolationbearingandtherelationshipbetweentherateofenergyconsumptionandbearingtheearthquakeresponseofthestructure,and
8、thelawsfromtheresultsaresummarizedaccordingly.Asthebearingenergyconsumptionrateincreases,theearthquakeresponseofthestructuretendstodecrease.Astheflexionweightratioisintherangeof5%~6%,theenergyconsumpti