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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(dòng)分析劉鵬，莫林輝，李世慧，楊國(guó)梁(1．湖南省吉懷高速公路建設(shè)開發(fā)有限公司，湖南懷化418000；2．湖南省交通規(guī)劃勘察設(shè)計(jì)院，湖南長(zhǎng)沙410008)【摘要]基于橋梁工程中廣泛應(yīng)用的變截面連續(xù)箱梁橋受移動(dòng)車輛荷載作用時(shí)的振動(dòng)方程解析解難以得到，本文運(yùn)用橋梁結(jié)構(gòu)動(dòng)力學(xué)和有限元方法，對(duì)Euler—Bernoulli梁?jiǎn)卧捎枚?jié)點(diǎn)的Hermite形函數(shù)，在假定的變截面模式基礎(chǔ)上，推導(dǎo)了梁高呈拋物線變化箱形截面梁?jiǎn)卧膭偠染仃嚭?/p>
2、質(zhì)量矩陣。在時(shí)域中采用精細(xì)時(shí)程積分法，編制了橋梁動(dòng)力響應(yīng)數(shù)值計(jì)算程序，對(duì)長(zhǎng)沙市某工程中變截面連續(xù)箱梁橋在車輛通過時(shí)的振動(dòng)響應(yīng)進(jìn)行了分析，研究了車輛速度和加速度變化對(duì)橋梁撓度的影響。模擬結(jié)果與已發(fā)表的文獻(xiàn)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(guān)鍵詞]連續(xù)箱梁橋；大跨度；精細(xì)積分；剛度；動(dòng)力響應(yīng)；數(shù)值模擬[中圖分類號(hào)]U448．215[文獻(xiàn)標(biāo)識(shí)碼]A[文章編號(hào)]1674—0610(2011)03—0011—05Vehicle--bridgeCouplingVibrationAnalysisofLong·-spanContinuousBoxGirderBri
3、dgewithVariableCrossSectionLIUPeng，MOLinhui，LIShihui，YANGGuoliang(1．HunanJihuaiExpresswayConstruction&DevelopmentLtd，Huaihua，Hunan418000，China；2．HunanProvincialHighwayPlanningSurveyandDesignInstitute，Changsha，Hunan410008，China)[Abstract]Basedonthecomprehensiveapplicationofcontinuousboxg
4、irderbridgewithvariablecrosssectioninbridgeengineeringcurrently，it’sdifficulttogetaanalyticalsolutioninvibrationequa．tionundermovingvehicleloads．Inthispaper，bridgestructuraldynamicsandthefiniteelementmethodwereadopted．Hermiteinterpositionfunctionoftwo—nodesforEuler-Bernoullibeamelementw
5、asutilized．Basedonpresumingmodeofanon—uniformrectangularcrosssectionbeamswithparabolicvariableheightsinaplane，thestiffnessmatrixandmassmatrixwerededucedtoanalyzenon—uniformmembersusedinengineeringstructuresincreasingly．Precisetimeintegralmethodwasusedindynamicresponseandanumericalcalcul
6、ationprogramofdynamicresponsewasworkedout．Thevibrationresponseofcon。tinuousboxgirderbridgewithvariablecrOSSsectioninaprojectofchangshacityundermovingvehicleloadswasanalyzed．Influenceofvehiclespeedandaccelerationchangestobridgedeflectionwasstudied．Simulationresultswerecomparedwithsomepre
7、viouslypublishedliteratures，andbridgedeflectioncansatisfyspecification．Itwasshownthisbridgehasabetterrigidity．[Keywords]continuousboxgirderbridge；long—span；preciseintegral；rigidity；dynamicre．sponse；numericalsimulation箱形截面能適應(yīng)各種使用條件，特別適合于預(yù)因此無論是公路或城市橋梁、高架道路，還是跨越寬應(yīng)力混凝土連續(xù)梁橋、變寬度橋，因?yàn)榍?/p>
