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1、{6橋梁建設(shè)2011年第5期文章編號:1【jO3—4722(2011)05—0036—04公路預(yù)應(yīng)力空心板梁橋單梁試驗及評定王亞軍,于坤。,蔡仕強(1.長安大學(xué)公路學(xué)院,陜西西安710064;2.蘭州大學(xué)土木工程與力學(xué)學(xué)院,甘肅蘭州730000;3.山東省交通規(guī)劃設(shè)計院,山東濟南250031)摘要:為了對公路預(yù)應(yīng)力混凝土空心板梁舊橋的承載力進行評定,采用單梁試驗及承載力評價方法。選取病害較重、橫向分布系數(shù)較大位置的空心板梁,按鉸接板法計算空心板跨中的橫向分布系數(shù),按照形心高度、面積和慣性矩不變的原則,將空心板等效為工字形截面,計算出單梁承載力和相應(yīng)的
2、理論應(yīng)力值及撓度值。對單梁進行試驗加載并測試其應(yīng)力和撓度,通過理論值與實測值的對比,評估單梁的結(jié)構(gòu)性能。通過對一座l3m跨徑預(yù)應(yīng)力空心板梁橋單梁試驗及受力性能進行評價,證明了單梁試驗是一種實用有效的方法。關(guān)鍵詞:板梁橋;簡支梁橋;預(yù)應(yīng)力混凝土橋;試驗;評定中圖分類號:U446.3文獻標(biāo)志碼:ATestingandEvaluationofSingleBeamofHighwayPrestressedConcreteHollowSlabBeamBridgeWANGYa—jun~。y【,run.CAIShi—qiang(1.SchoolofHighway,C
3、hanganUniversity,Xian710064,China;2.SchoolofCivilEngineeringandMechanics,I.a(chǎn)nzhouUniversity,Ianzhou730000,China;3.Shah—dongProvincialTransportPlanningandDesignInstitute,Jinan250031。China)Abstract:Toevaluatethebearingcapacityofoldhighwayprestressedconcrete(PC)hollowslabbeambridg
4、es,themethodoftestingandbearingcapacityevaluationofsinglebeamwasemployed.Thehollowslabbeamswithseveredeteriorationsandatthe1ocationswherethetrans—versedistributioncoefficientsweregreatwereselectedandthetransversedistributioncoefficientsofmidspansoftheslabbeamswerecalculatedbyth
5、ehingedslabmethod.TheslabbeamswerefirstlyequalizedastheI—shapeCROSSsectionsontheprinciplethatthecentroidheight.a(chǎn)reasandmomentofinertiaremainedunchangedandthebearingcapacityofasinglebeamandthecorre—spondingtheoreticstressanddeflectionvalueswerecalculated.Thesinglebeamwasthenload
6、ed.testedanditsstressanddeflectionweremeasured.Bycomparisonofthetheoreticandmeasuredvalues,thestructuralperformanceofthesinglebeamwasfinallyevaluated.Thetestingandeval-uationofmechanicalbehaviorofthesinglebeamofal3-mspanPChollowslabbeambridgeprovesthatthemethodoftestingandbeari
7、ngcapacityevaluationherewithiswellpracticalandef—fective.Keywords:slabbeambridge;simply—supportedbeambridge;prestressedconcretebridge;testing;evaluation收稿日期:2010?12—02專業(yè)毒簡介:王亞軍(1978一),男,講師,2001年畢業(yè)于石家莊鐵道學(xué)院土木工程專業(yè),工學(xué)學(xué)士,2005年畢業(yè)于蘭州交通大學(xué)橋梁與隧道工程,工學(xué)碩士(qawyj@163.COm)公路預(yù)應(yīng)力空心板梁橋單梁試驗及評定王亞軍,
8、于坤,蔡仕強371引言面如圖2所示。預(yù)應(yīng)力空心板梁橋由于具有安裝方便、制造簡單、能加快施工進度、節(jié)約工程造價