金海四道三号桥位于温州滨海核心区,为滨湖风貌桥之一。主桥采用拱肋组合梁,跨径布置为30 m + 50 m + 30 m。文章以金海四道三号桥为背景,介绍了该桥相关的设计内容,分析了中跨边梁向侧上方外挑情况下,增设轻型拱肋对桥梁的影响。由分析结果可知,增设拱肋后,边梁正应力最大减少27.84%,挑臂正应力最大减少37.36%,相较于中梁正应力最大增加29.66%,增设轻型拱肋的收益更大,能有效优化桥梁整体应力,使结构更加安全,且拱肋本身的应力情况良好。Jinhai 4th Avenue Bridge No. 3 is located in the core area of Binhai in Wenzhou. It is one of the bridges with lakeside scenery. The main bridge adopts arch rib composite beams with a span arrangement of 30 m + 50 m + 30 m. Based on the background of the No. 3 Bridge, this paper introduces the related design contents of the bridge. The effect of adding light arch ribs on the bridge is analyzed when the mid-span side beam is lifted out from the side. The results show that the normal stress of the side beam and the outrigger arm are reduced by 27.84% and 37.36% respectively after the addition of arch ribs. Compared with the 29.66% increase in the normal stress of the middle beam, the addition of light arch ribs has greater benefits and can effectively optimize the overall stress of the bridge. The structure is more secure, and the stress of the arch rib itself is good.
