半幅高架与环形匝道组合互通式立交桥设计

Design of Interchange Combined with Half-roadway Viaduct and Ring Ramp

小西湖立交改造工程为我国Ⅷ度以上高震区较大规模的互通式立交,桥梁面积26 512.7 m2,桥梁上部结构及下部结构类型较多,环形匝道采用平曲线最低指标,最小半径仅15m,主线共布置了16种桥墩类型,匝道布置了6种类型桥墩。该文重点介绍该立交改造工程的方案设计思路、技术难度、结构与构造形式及受力状况,可为同类立交桥设计提供借鉴。

Xiaoxihu Interchange Reconstruction Project is a larger scale of interchange in more than VIII degrees of high seismic zone in China. Its bridge area is 26512.7 m 2 . There are more types of the upper structures and substructures of the bridge. The ring ramp uses the minimum index curve and the minimum radius is 15 m only. The main line of interchange is arranged of 16 pier types and its ramp is arranged of 6 pier types. The article focuses introduction on the design thinking, technical difficulty, structure, construction type and stress of this interchange reconstruction project, which can be referred for the design of the similar projects.