小半径预应力混凝土弯桥结构设计之浅谈

Elementary Discussion on Structural Design of Small-radius Pre-stressed Concrete Curved Bridge

在诸多城市立交及上跨桥匝道设计中,常遇到桥梁位于较小曲线半径上,且桥梁宽度较窄、跨径须较大等复合条件的限制,给结构设计带来困难。以重庆市机场南联络道立交工程———新龙湾立交匝道桥为例,系统地比较分析采用偏心固结墩设计、横梁底双支座布置、主梁分段施工等方式,对弯桥支座脱空、预应力摩阻损失过大、主梁扭矩过大等不利因素进行改善,为解决类似桥梁设计提供一定的参考意见。

In the design of many urban grade separations and overpass ramps,there are the complex limitations of bridge located at the smaller curve radius,narrower bridge width and longer span,which will bring the difficulty to the structural design.As an example of Chongqing Airport South Connection Way Grade Separation Project – Xinlongwan Grade Separation Ramp,the article systematically compares and analyzes the design of eccentric consolidation pier,layout of crossbeam bottom double bearing and construction of the main girder by sections so as to improve the disadvantage factors of the curved bridge bearing cavity,the excessive prestressed friction loss and the excessive torque of the main beam,which provides some references for the design of the similar bridges.