小半径曲线梁桥设计要点

现阶段桥梁由于地形条件的限制,多采用曲线桥梁和匝道桥。特别是小半径曲线梁桥,除承受弯矩、剪力外,还有较大扭矩和翘曲双力矩的作用。在施工运营中会出现很多问题,产生问题的原因是多方面的,有的在连续梁曲线内侧端支座脱空;有的曲线梁体向曲线外侧径向整体侧移;有的墩梁固结处在立柱顶部(与梁底衔接处)产生水平环形裂缝等危及桥梁正常使用的现象。该文结合某跨铁路上跨立交桥的设计,浅谈小半径曲线箱梁的设计要点。

Design Gist of Small-radius Curve Beam Bridge

The curve beam bridge and ramp bridge are mostly used for the bridges in the present phase because of limited by the terrain condition.Especially,the small-radius curve beam bridge has the actions of larger torsional moment and warping duo-moment besides enduring the bending moment and shearing force.There are many problems happening in the construction and operation.The causes of the problems are the voids in the support at the inner side end of the continuous beam curve,the integral lateral movement verti...