研究结论: 曲线槽形梁的受力呈现明显的空间特性，在竖向荷载作用下，曲线外侧主梁下缘承受的拉力较大，曲线内侧相对较小，道床板的剪力滞现象比较显著，支座不均匀沉降10 mm 对梁体的受力影响不大。在上部竖向荷载逐渐增加的过程中，主梁上翼缘产生的内向侧移越来越大，槽口逐渐缩小。弯扭耦合效应使槽形梁曲线内、外侧的支反力大小不一，曲线外侧梁端支座反力比曲线内侧大，梁体有向曲线内侧整体平移变形的趋势。
Abstract：Research purposes: Curved trough girder is an open structure which consists of girder and slab，the girder can generate bending － torsion coupling effect and slab can produce biaxial bending and torsion under vertical load，thes tress of curved trough girder is very complicated． Combined with the stress analysis of curved simple trough girder with two － lane railway，the mechanical properties of curved trough girder are studied to provide guidance for design and construction．
Research conclusions: The stress of curved trough girder indicates obvious spatial character． The tesion endured by the lower flange of outside main girder of curve is large，while the inside main girder of curve is relatively small under vertical load． The shear lag in slab is remarkable． The non － uniform settlement 10mm has little effect on the girder force． With the gradual increase of vertical load on the top，the inward lateral displacement which occurs to the top flange of main girder becomes lager and lager，and the notch of trough girder truns smaller and smaller． The bending －torsion coupling effect causes the different support reaction of trough girder between the inner side and the outer side of curve，the support pressure of outer side of curve is greater than those of inner side of curve at beam end． The girder has a tendency of whole transverse deflection towards the inner side of curve．
Li Li，Wang Zhenling，Zhang Yuning． Fracture Load Test and Spatial Analysis for the Full Scale Model of Underground Viaduct Channel Girder ［J］． China Railway Science， 2005( 5) : 31 － 35．
2012, Vol. 29 
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