曲线箱梁桥的裂缝防治研究

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1、Prestressedconcretecontinuouscurveboxgirderbridgeisverycommonmodernurbantrafficandhighwaybridgebecauseof汁sbeautifulandsmoothfluentlineshape.Itcanwellsatisfyroadhorizontalalignmentandhasbecomethemaintypeofoverpassrampbridge.Butcontinuouscurveboxgirderbridgebelongstospacestructuralsystem,it

2、ssalientfeaturesisbending-torsionalcouplingeffect.Influencedbybending,twisted,theshear・lageffectandtorsionaldeformationboxsectiorfsmechanicalcharacteristicsareverycomplex.Prestressedcableofcurvebeamisdoublecurvaturecableingeometry,soitsequivalentforceandprestressedfrictionlossismorecomple

3、xthanstraightbridges.UsingthestaticanddynamicloadtestandfiniteelementmodelstoanalyzethestressAnddeformationcharacteristicsindifferentconditionsofprestressedconcretecontinuousCurveboxgirderbridge,汁providesapowerfulproofforprestressedconcretecontinuousCurveboxgirderbridgecrackprevention・Thi

4、sPapersummarizesthedesigntheoryandcalculationmethodofprestressedConcretecontinuouscurveboxgirderbridge.W汁hprestressedconcretecontinuouscurveBoxgirderbridgeasthebackground,useMidaswhichisafiniteelementanalysissoftwareToanalysisstructure.Setfived讦ferentprestressedadjustmentschemetoanalysiss

5、tressChangesofcurvebridgeandcomparewiththeoriginalprogram・Throughtheanalysis,findOutthatiftheinsideandoutsideribstheboxgirdersaregaveasymmetricpreress,itcanEffectivelyimprovestressperformance,reducethebending-torsionalcouplingeffectandpreventthecracksoccurring・Analysisinginfluencetocurved

6、girderBridgesbythedifferentcurvatureradius,temperatureeffectandcrossbeam,thedeformationandstressruleofprestressedconcretecontinuouscurveboxgirderbridgewillbesummarizedandthefactorsinfluencingcurveboxgirderbridgecrackwillbefound.预应力混凝土连续曲线箱梁桥以其优美、平滑、流畅的线形而成为一种非常常见的现代城市道路和高速公路桥。它能较好地满足公路平面线

7、形要求，因此已经成为立交桥匝道的主要形式。但是连续曲线箱梁桥属于三维结构体系,其典型特点是考虑了弯扭耦合效应影响。受到弯、扭.大曲率箱梁剪滞效应和扭转变形影响的箱型截面的力学特性是非常复杂的。预应力索曲线梁在几何上是成双向弯曲形的，所以其等效力和预应力摩擦损失与直线桥相比较为复杂。使用静态和动态加载试验以及有限元模型分析预应力混凝土连续曲线箱梁桥在不同荷载组合下的应力和变形特性，这将为预应力混凝土连续曲线箱梁桥裂缝的预防提供了一个有力的证明。本文总结了预应力混凝土连续曲线箱梁桥的设计理论和计算方法。以预应力混凝土连续曲线箱梁桥