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1、第36卷,第3期公路、工程Vo1.36,No.32011年6月HighwayEngineeringJun.,2011大跨度變截面連續(xù)箱梁橋車橋耦合振動分析劉鵬,莫林輝,李世慧,楊國梁(1.湖南省吉懷高速公路建設開發(fā)有限公司,湖南懷化418000;2.湖南省交通規(guī)劃勘察設計院,湖南長沙410008)【摘要]基于橋梁工程中廣泛應用的變截面連續(xù)箱梁橋受移動車輛荷載作用時的振動方程解析解難以得到,本文運用橋梁結構動力學和有限元方法,對Euler—Bernoulli梁單元采用二節(jié)點的Hermite形函數(shù),在假定的變截面模式基礎上,推導了梁高呈拋物線變化箱形截面梁單元的剛度矩陣和質量矩陣。在時域中采
2、用精細時程積分法,編制了橋梁動力響應數(shù)值計算程序,對長沙市某工程中變截面連續(xù)箱梁橋在車輛通過時的振動響應進行了分析,研究了車輛速度和加速度變化對橋梁撓度的影響。模擬結果與已發(fā)表的文獻吻合較好,撓度滿足規(guī)范要求,表明該橋具有良好的剛度。[關鍵詞]連續(xù)箱梁橋;大跨度;精細積分;剛度;動力響應;數(shù)值模擬[中圖分類號]U448.215[文獻標識碼]A[文章編號]1674—0610(2011)03—0011—05Vehicle--bridgeCouplingVibrationAnalysisofLong·-spanContinuousBoxGirderBridgewithVariableCross
3、SectionLIUPeng,MOLinhui,LIShihui,YANGGuoliang(1.HunanJihuaiExpresswayConstruction&DevelopmentLtd,Huaihua,Hunan418000,China;2.HunanProvincialHighwayPlanningSurveyandDesignInstitute,Changsha,Hunan410008,China)[Abstract]Basedonthecomprehensiveapplicationofcontinuousboxgirderbridgewithvariablecrossse
4、ctioninbridgeengineeringcurrently,it’sdifficulttogetaanalyticalsolutioninvibrationequa.tionundermovingvehicleloads.Inthispaper,bridgestructuraldynamicsandthefiniteelementmethodwereadopted.Hermiteinterpositionfunctionoftwo—nodesforEuler-Bernoullibeamelementwasutilized.Basedonpresumingmodeofanon—un
5、iformrectangularcrosssectionbeamswithparabolicvariableheightsinaplane,thestiffnessmatrixandmassmatrixwerededucedtoanalyzenon—uniformmembersusedinengineeringstructuresincreasingly.Precisetimeintegralmethodwasusedindynamicresponseandanumericalcalculationprogramofdynamicresponsewasworkedout.Thevibra
6、tionresponseofcon。tinuousboxgirderbridgewithvariablecrOSSsectioninaprojectofchangshacityundermovingvehicleloadswasanalyzed.Influenceofvehiclespeedandaccelerationchangestobridgedeflectionwasstudied.Simulationresultswerecomparedwithsomepreviouslypublishedliteratures,andbridgedeflectioncansatisfyspe
7、cification.Itwasshownthisbridgehasabetterrigidity.[Keywords]continuousboxgirderbridge;long—span;preciseintegral;rigidity;dynamicre.sponse;numericalsimulation箱形截面能適應各種使用條件,特別適合于預因此無論是公路或城市橋梁、高架道路,還是跨越寬應力混凝土連續(xù)梁橋、變寬度橋,因為嵌