新洋港大跨径部分斜拉桥设计

新洋港特大桥为跨径组合120m+216m+120m的预应力混凝土部分斜拉桥,主桥跨径位于国内同类桥梁前列。文中主要介绍工程概况、技术标准、结构特点以及设计计算方法。主桥采用左、右幅分离布置并共用中塔的横向3塔方案,在保证了功能需求的同时也兼顾了桥梁结构受力的合理性。针对横向3塔的布置形式,采用塔梁分离、塔墩固结的半漂浮体系,有效处理了梁、塔、墩布设的难题。

Design Overview of Xinyanggang Partial Cable-stayed Bridge with Long Span

Xinyangang bridge is a prestressed concrete partial cable-stayed bridge with span combination of 120 m＋ 216 m＋120 m. The span of main bridge is at the forefront of similar domestic bridges. The project overview,technical standards, structural features and design calculation method are introduced in this paper. The main bridge adopts horizontal three-pylon scheme which has left and right two separated decks sharing the middle pylons. The functional requirements are ensured,and the reasonability of bridge structure is also taken into consideration. Regarding horizontal three-pylon scheme, semi-floating system with pylon-beam isolation and pylon-pier consolidation effectively are adepted which solves the difficulty of layout of beams, pylons and piers.