预应力混凝土曲线梁桥的扭转效应研究

Research on Torsion Effect of Prestressed Concrete Curved Girder Bridge

小半径预应力混凝土曲线梁桥存在明显的扭转效应,可能导致梁体剪应力大、扭转变形大和内外支座反力差大。文章提出了扭转效应的五种导致因素,并结合一联曲线箱梁实例,计算分析了各种因素所产生扭矩的大小与分布情况,进而探讨了扭矩对梁应力和支座反力的影响,最后总结了曲线梁桥的抗扭设计要点。

The small-redius prestressed concrete curved girder bridge has obvious torsional effects, which may cause the large girder shear stress, large torsional deformation and big difference of reac- tion force between the inner and outer supports.This article proposed five factors that lead to torsion effect, and combined with the actual example of an associated curved box girder, it calculated and an- alyzed the size and distribution of torque adsing from various factors,then further discusses the impact of torque on girder stress and the reaction force of supports,and finally concluded the torsional design keY-points of curved girder bddaes.