预应力混凝土曲线梁桥几个问题研究

曲线梁桥是弯扭耦合作用下的空间受力结构,现行桥梁规范所包括的内容滞后于桥梁的发展,平面分析的方法已不适用。文中对曲线梁桥的弯扭耦合效应、内外梁体受力不均以及恒载作用下结构产生较大的转矩等受力特点进行了分析。分析结果表明：曲线梁桥中间支承方式的设定不能改变支座的反力,外侧腹板弯矩内力均大于内侧腹板的弯矩内力,曲线半径越小,变化幅度越大。

Spatial Analysis of P.C Curved Bridges

Curved girder is a structure under the coupling effect of bend-twist,the content of using bridge criterion has lagged behind the development of bridge,and planar analysis special isn＇t applicable for it.In this thesis,the mechanics characteristic of structure load was studied with coupling effect of bend-twist,unbalanced force on inner beam and outer beam and the effect of dead load.The results show that curved girder＇s support reaction cannot be changed by setting the intermediate supporting form.The bending moment of lateral web plate is greater than the bending moment of medial web plate,the smaller curve radius,the bigger the variation range.