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1、第31卷第6期2014年6月公路交通科技JournalofHighwayandTransportationResearchandDevelopmentVoL31No.6Jun.2014doi:10.3969/j.issn.1002—0268.2014.06.012基于可靠度分析的既有鋼筋混凝土橋梁性能評(píng)估盧照輝1,王璐璐2,葉文亞1,彭衛(wèi)2(1.寧波市公路管理局,浙江寧波315040;2.浙江大學(xué)寧波理工學(xué)院,浙江寧波315100)摘要:結(jié)合實(shí)際橋梁混凝土強(qiáng)度和鋼筋銹蝕檢測數(shù)據(jù),考慮材料性能經(jīng)時(shí)變化特點(diǎn),構(gòu)建了鋼筋混凝土橋梁簡支梁橋空心板梁彎矩抗力衰減模型;按照《公路工程結(jié)構(gòu)可靠度
2、設(shè)計(jì)統(tǒng)一標(biāo)準(zhǔn)》(GB/T50283--1999)建立橋梁結(jié)構(gòu)上的恒載作用效應(yīng)概率模型和活載作用效應(yīng)概率模型;以簡支板梁跨中彎矩作為功能函數(shù),運(yùn)用根據(jù)Jc法所編制的Matlab程序計(jì)算每片板梁的可靠指標(biāo)。運(yùn)用結(jié)構(gòu)體系失效概率的點(diǎn)估計(jì)方法之一——概率網(wǎng)絡(luò)估算技術(shù),通過近似數(shù)值分析計(jì)算得出橋梁上部結(jié)構(gòu)體系的可靠指標(biāo)。并用算例驗(yàn)證了本文所提出的橋梁性能評(píng)估方法的正確性和可行性。關(guān)鍵詞:橋梁工程;鋼筋混凝土橋梁;性能評(píng)估;可靠指標(biāo);JC法中圖分類號(hào):U445.7文獻(xiàn)標(biāo)識(shí)碼:A文章編號(hào):1002—0268(2014)06—0080—06AssessmentofPerformanceofExis
3、tingRCBridgesBasedonReliabilityAnalysisLUZhao.huil,WANGLu.1u2,YEWen—yal,PENGWei2(1.NingboHighwayAdministrationBureau,NingboZhejiang315040,China;2.NingboInstituteofTechnology,ZhejiangUniversity,NingboZhejiang315100,China)Abstract:Consideringthematerialpropertiesvariationwithtime,thehollowbeambe
4、nding‘resistancedeteriorationmodelofsimplysupportedreinforcedconcretebeambridgeisconstructedbasedonthefieldtestdataaboutconcretestrengthandreinforcementcorrosion.Thestructuraldead/liveloadactioneffectprobabilitymodelsareestablishedrespectivelyaccordingtoUn圻edStandardforReliabilityDesignofHighw
5、ayEngineeringStructures(GB/T50283--1999).Takingthemid—spanbendingmomentofsimplysupportedplategirderastheperformancefunction,thereliabilityindicatorofeachplategirderiscalculatedusingMatlabprogramdevelopedaccordingtoJCmethod.Thereliabilityindicatorofthebridgesuperstructureisobtainedthroughapprox
6、imatenumericalanalysisbyprobabilisticnetworkevaluationtechnique(PNET),oneofthepointestimationmethodforthefailureprobabilityofstructuralsystem.Thecorrectnessandfeasibilityoftheproposedbridgeperformanceassessmentmethodisverifiedwithanumericalexample.Keywords:bridgeengineering;reinforcedconcreteb
7、ridge;performanceassessment;reliabilityindicator;JCmethod0引言在役結(jié)構(gòu)的性能評(píng)價(jià)應(yīng)以實(shí)測參數(shù)與設(shè)計(jì)計(jì)算的結(jié)果為依據(jù),按照《公路工程結(jié)構(gòu)可靠度設(shè)計(jì)統(tǒng)一標(biāo)準(zhǔn)》(GB/T50283--1999)?進(jìn)行評(píng)估。但由于缺乏整體結(jié)構(gòu)達(dá)到承載能力極限狀態(tài)的相關(guān)信息,且設(shè)計(jì)規(guī)范有所改變,使得人們對(duì)在役橋梁結(jié)構(gòu)的承載能力和安全性產(chǎn)生擔(dān)憂‘2I。行業(yè)內(nèi)常用的做法收稿日期:2013—07—15基金項(xiàng)目:寧波市交通委科技計(jì)劃項(xiàng)目(201