摘要
Abstract
Curved box girder has both characters of curved girder and box girder, and the coupling effect between bending moment and torsion moment caused by the curvature under vertical load should be taken into account. Based on research results of curved girder at home and abroad, the spatial mechanical characters and influencing factors of curved box girder were summarized in this thesis. Choosing a 60m single-span curved PC simply supported girder with single cell boxed cross-section as the example, spatial plate element models were established by TDV finite element software. Then the distributions of normal stress and shear stress of cross-section of main girder with different curve radius under the action of dead load were analyzed. Afterwards, according to the relationship between bending deformation and strains, and by comparing the transverse distributions of normal stress of curved bridge with that of straight bridge, the thesis put forward a view point that the stress variation caused by the arc length difference between the internal arc and external arc of the curve can be expressed by a magnification coefficient. Analysis results show that, except the effect of shear lag, the distributions of normal stress of cross-section of curved bridge is correlated with the stress magnification coefficient which is caused by the arc length difference between internal arc and external of the curve.关键词
曲线箱梁/弯扭耦合/有限元分析/应力分布/受力机理Key words
curved box girder/ bending-torsion coupling/ FEM analysis/ stress distribution/ stress mechanism分类
交通工程
