梁桥拓宽改造中不同纵缝构造处理模式力学性能比较

目前桥梁拓宽改建中常用的纵缝处理方式有新旧桥梁之间设置纵向断缝、翼缘板刚性连接或铰接。纵缝铰接或纵缝刚接均能起到减载效果,铰接不如刚接减载效果明显,但是铰接能够更好的适应老桥边梁悬臂板的受力与构造要求,而且比起纵向刚接来,纵缝铰接在施工难度与工程造价上都有明显的优势,是一种在中小跨径梁桥拓宽改建中值得推广的方案。

Compare the Mechanical Properties with Different Longitudinal Connection Methods on Widen and Rebuild Beam Bridges

Setting longitudinal break gaps between the new and the old bridges and rigid or hinge connected the flange slabs are the usual disposal methods in widen and rebuild bridges.The hinge and the rigidconnection in longitudinal gaps both can bring the offload effect,and the rigid connection is more prominent than the hinge connection on offload effect.But the hinge connection is adapt for the stress and construction requires on the old side cantilever slabs and it has obvious advantage on construction and engineering cost than the longitudinal connection.It is recommendable on widen and rebuild medium and small bridges.