嘉松公路越江大桥总体计算分析

General Calculation and Analysis of Jiasong Highway River-Crossing Bridge

摘要:

在建嘉松公路越江大桥位于上海市松江区，主桥采用130 m+336 m+130 m = 596 m半漂浮体系自锚式悬索桥。桥塔为门形混凝土塔，窗花形钢横撑。主梁采用混合梁，主缆锚固段为混凝土箱梁，其余梁段均采用钢箱梁+组合桥面板结构。主缆为平行双缆面，边、中跨均设置吊索，每个吊点设置双吊索。大桥采用了先斜拉后悬索的施工工艺，跨中185 m范围未设置支架，而是选择利用斜拉索对主梁进行临时支撑，主跨合龙形成斜拉桥体系后再体系转换为悬索桥。经验算，施工阶段和成桥运营阶段结构的强度、刚度和稳定性均满足设计要求。

Abstract:

The under-construction Jiasong Highway River-Crossing Bridge is located in Songjiang District, Shanghai. The main bridge is a (130+336+130) m -span semi-floating system self-anchored suspension bridge. Its pylon is a portal-shaped concrete pylon with a window-lattice steel cross brace. Its main girder is a composite structure. The main cable anchorage section is a concrete box girder, and the rest girder sections are the steel box girder + composite bridge deck structures. The main cables are arranged in two parallel cable planes, and the slings are set up in both the side and main spans. Each hoisting point is equipped with double slings. The construction process of “first cable stayed and then suspending cable” is adopted for the bridge. The supports are not installed in the range of 185m mid-span, instead, it is chosen to use the stayed cables to temporarily support the main girder. After the main span is closed to form a cable-stayed bridge system, the structural system is converted to a suspension bridge. Through verification, the structural strength, stiffness and stability all meet the design requirements during both the construction phase and the operational phase after completion.