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ID:49657193
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页数:10页
时间:2020-03-03
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1、Reviewofassessmentandrepairoffire-damagedRChighwaybridgesAbstract:Thispaperpresentsareviewoftheprogressoftheresearchandengineeringpracticeofassessmentandrepairoffire-damagedRChighwaybridges,basedonwhichexistingandpressingproblemsoftheevaluationmethodarepointedout.Atlast,Prospectforthed
2、evelopmentofassessmentandrepairoffire-damagedhighwaybridgesisalsoproposed.Keywords:firedamage;assessment;repairtechniques;RCstructure;bridge1PrefaceFirescancausegreatstructuraldamagetobridgesandmajordisruptiontohighwayoperations.Theseincidentsstemprimarilyfromvehicleaccident(oftenoilta
3、nker)fires,bridgesmightalsobedamagedbyfiresinadjacentfacilitiesandfromothercauses.Quiteafewofthem,thoughrarelyhappened,leadtoseverestructuraldamageorcollapseandcasualty.OnJune2,2008,firedisasterbrokeoutunderthe18thspanofNanjingYangtzeRiverBridgeandlastedforapproximate75min.Duringthefir
4、e’sdevelopmentandextinguishment,thestructureexperiencedthesharpriseandfallintemperaturecausingseveredamagetofire-strickensegments.OnApril29,2007,agasolinetankeroverturnedontheconnectorfromInterstate8OtoInterstate880inCalifornia.Theintenseheatfromthesubsequentfuelspillandfireweakenedthe
5、stee1underbellyoftheelevatedroadway,collapsingapproximately165feetofthiselevatedroadwayontoasectionofI—880below.OnMarch25,2004,Connecticut,UnitedStates,atankertruckcarryingfuelswervedtoavoidacarandoverturned,dumping8000gallonsofhomeheatingoilontotheHowardAvenueoverpass.Theconsequenttow
6、eringinfernomeltedthebridgestructureandcausedthesouthboundlanestosagseveralfeetUndocumentednumberofbridgefiresoccurringthroughouttheworldeachyearcausevaryingdegreesofdisruption,repairactions,andmaintenancecost.Althoughfirescauseddamagetothebridgestructures,somebridgescontinuetofunction
7、afterproperrepairandretrofit.Stillinsomesituationstheyhavetoberepairedforthecauseoftrafficpressureeventhoughsupposedtobedismantledandreconstructed.However,inothercases,structuresareseverelydamagedinthefiredisasterandfailtofunctionevenafterrepair,orthecostsofrepairandretrofitoverweigh
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