混凝土曲线梁桥的主梁爬移机理研究

Research on Creepage Mechanism of Main Beam of Concrete Curved Beam Bridge

曲线梁桥受结构自身受力特点的影响,尤其是小半径曲线梁桥比直线梁桥更容易出现如支座脱空、梁体爬移以及墩梁裂缝等病害。通过对混凝土曲线梁桥在温度效应、混凝土收缩徐变、基础沉降作用下的横向爬移定性分析可知,混凝土曲线梁桥在设计及施工阶段,必须对温度效应(均匀升温、梯度升温)、混凝土收缩徐变、基础沉降等自然因素综合考虑并予以重视,避免和控制混凝土曲线梁桥容易出现典型的病害,以供同类工程参考。

Curved girder bridges are affected by the stress characteristics of the structure itself, especially small radius curved girder bridges are more prone to diseases such as bearing void, beam creep, pier beam cracks, etc. Than straight girder bridges.By making a qualitative analysis of the lateral creep of concrete curved girder bridges under the effects of temperature, concrete shrinkage and creep, and foundation settlement, it is concluded that in the design and construction stages of concrete curved girder bridges, natural factors such as temperature effects(uniform temperature rise, gradient temperature rise), concrete shrinkage and creep, and foundation settlement must be comprehensively considered and paid attention to, to avoid and control the typical diseases of concrete curved girder bridges, which can be used as reference for similar projects.