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1、第29卷第5期2012年5月公路交通科技JoumalofHighwayandTransportationResearchandDevelopmentVol-29No.5Mav2012dol:10.3969/j.issn.1002—0268.2012.05.014鋼一混凝土組合梁的溫度應(yīng)力計算周良,陸元春,李雪峰(上海市城市建設(shè)設(shè)計研究總院,上海200125)摘要:重點考察了鋼一混凝土組合梁在任意溫度分布作用下應(yīng)力的計算方法。茵先在指出傳統(tǒng)溫度應(yīng)力計算方法不足的同時,根據(jù)結(jié)合面變形協(xié)調(diào)條件和曲率相同假設(shè),
2、推導(dǎo)出不考慮滑移時,矩形溫差作用下組合梁應(yīng)力的計算方法;接著采用有限元理論,推導(dǎo)出任意溫度分布下,組合梁溫度應(yīng)力的計算方法。并分別給出溫度梯度和矩形溫差作用下的溫度應(yīng)力計算公式;最后以桌一鋼一混凝土組合梁為例,將各方法的計算結(jié)果進行了比較。結(jié)果表明:對于適用于計算矩形溫差的基于曲率的方法,計算矩形溫差作用下的應(yīng)力,與通用有限元軟件模擬結(jié)果相吻合;對于適用于計算任意溫度分布形式的有限元方法,計算溫度梯度分布下的應(yīng)力,與通用有限元軟件模擬結(jié)果吻合較好。關(guān)鍵詞:橋梁工程;鋼一混凝土組合梁;有限元方法;溫度應(yīng)力
3、計算方法;變彤協(xié)調(diào);溫度梯度中圖分類號:U441+.5文獻(xiàn)標(biāo)識碼:A文章編號:1002—0268(2012)05—0083—06CalculationofTemperatureStressofSteel—concreteCompositeBeamZHOULiang,LUYuanchun,LIXuefeng(ShanghaiUrbanConstructionDesignandResearchInstitute,Shanghai200125,China)Abstract:Thecalculationmeth
4、odoftemperaturestressofsteel—concretecompositebeamunderarbitrarytemperaturedistributionwasdiscussed.First.thedisadvantageoftraditionalmethodforcalculatingtemperaturestresswaspointedout.Amethodforcalculatingstressunderrectangletemperaturedifferencewithout
5、consideringtheeffectoftheslipbetweensteelbeamandconcretedeckwasderivedbasedonthedeformationcompatibilityconditionofthejointsurfaceandtheassumptionofidenticalcurvature.Second,basedonthefiniteelementtheory,anotherca].eulationmethodwasderived,andtheformulas
6、forcalculatingthetemperaturestressundertemperaturegradientandrectangletemperaturedifterenceweredevelopedrespectively.Finally,takenasteel—concretecompositebeamforexample,thecalculationresultsfromeachmethodwerecompared.Itshowsthat(1)forcalculatingthestress
7、underrectangletemperaturedifference,theresultusingthemethodsuitableforcalculatingrectangletemperaturedifferencebasedoncurvatureagreeswellwiththatusingfiniteelementanalysissoftware;(2)forcalculatingthestressundertemperaturegradient.theresultusingthemethod
8、suitableforeMeulminganytemperaturedistributionbasedonthefiniteelementmethodagreeswellwiththatusingfiniteelementanalysissoftware.Keywords:bridgeengineering;steel—concretecompositebeam;finiteelementmethod;methodforcalculatin