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旧桥的加固与改造是目前我国交通部门的一项十分紧迫而又繁重的工作。探讨经济而又合理的加固方法是桥梁界一个重要的课题。美人潭双曲拱桥位于湖北省谷城县境内,建于1994年。目前,主拱圈和腹拱圈均出现了横向裂缝、基础受水流冲刷损伤、桥面局部发生沉陷和坑槽。在对既有浆砌片石主拱圈病害分析的基础上,提出增大主拱圈截面的加固方案,并对该方案进行了加固仿真分析。计算结果显示:增大截面措施可以明显改善老桥主拱圈的受力性能,在拱上建筑、汽车活载、升降温及拱脚强迫位移共同作用下,老拱圈受力性能明显改善,提高了全桥的承载力。
The reinforcement and transformation of the old bridge is a very urgent and arduous task for the transport sector in our country. It is an important issue for the bridge community to explore economical and reasonable reinforcement methods. Mei Tan double curved arch bridge is located in Gucheng County, Hubei Province, built in 1994. At present, there are horizontal cracks in both the main arch ring and the girth ring, and the foundation is damaged by the flow erosion and the bridge deck partially sinks and pits. Based on the analysis of the main arch ring failure of existing masonry stone, the reinforcement scheme of increasing the section of the main arch ring is proposed, and the reinforcement simulation analysis of the scheme is carried out. The calculation results show that the increase of cross-section measures can obviously improve the stress performance of the main arch ring of the old bridge, and the stress performance of the old arch ring obviously improves under the joint action of arch construction, live load, Improve the bearing capacity of the bridge.