组合-混凝土连续混合梁桥接头位置研究

Study of the Joint in Composite-concrete Continuous Beam Bridge

本文以长春某立交跨线桥三跨连续梁主桥为背景,在原桥的基础上把中跨150m预应力混凝土梁改为组合—混凝土混合梁结构,选择不同的接头位置,建立MIDAS CIVIL有限元模型.采用挂篮悬臂浇筑法施工,并考虑施工阶段的荷载对内力的影响,在恒载状态下,计算主梁的内力.通过对主梁内力的综合比较后,得出组合-混凝土连续混合梁桥的接头位置布置在三分之一主跨位置处附近各项指标都较好的结论.

In this paper,taking one of Changchun Overpass Bridge of three- spans continuous beam bridges as the background,on the basis of the original bridge, the 150 m middle span prestressed concrete beams replaced by a combination of concrete composite beam structure. Then,establish finite element models MIDAS CIVIL with different joint position,calculate the internal force of the whole bridge under the constant load condition. Finally,obtain a more reasonable joint position upon comprehensively comparison of the whole bridge internal force.