高速铁路先拱后梁法提篮拱桥设计研究

Design and Research on Basket Handle Arch Bridge by Method of Arch First and Beam Late in High-speed Railway

研究目的:青阳港是四级航道,京沪高速铁路青阳港大桥采用单孔96 m尼尔森体系的提篮式系杆拱桥跨越。为满足通航要求,采用先拱后梁法施工,本文介绍了96 m尼尔森体系的提篮式系杆拱桥的设计方案,根据桥梁实际施工阶段建立有限元计算模型,计算桥梁主体结构应力,阐明先拱后梁的施工工艺。研究结论:计算结果表明:(1)桥梁主体结构各截面应力水平均在相应材料的容许应力范围,均满足规范要求;(2)调整基础的刚度,可以改变拱肋跨中的位移、拱肋钢管的应力、混凝土的应力及吊杆的应力;(3)先拱后梁法施工,钢管拱肋先受力,必须具有足够的强度和刚度;(4)先拱后梁法无支架施工满足了通航的要求,具有很大的社会效益,可为类似工程提供参考。

Research purposes： Qingyang port is the channel four. The Qingyang port bridge is a basket handle arch bridge of Nielson system with a single span of 96m . In order to meet the requirements of navigation, the arch first and beam late construction method is used. This article introduces the design of 96m basket handle arch bridge of Nielson system. The stress of the main structure of the bridge is calculated according to the established finite element model of bridge actual construction phase. It explains arch first and beam late construction method. Research conclusions： Calculation results show that each cross section stress of the main bridge structure is in the corresponding material allowable stress range and meets the requirements of the code. Adjusting the stiffness of foundation, can change the displacement of arch rib span, arch rib steel pipe stress, concrete stress and rod stress. It needs sufficient strength and rigidity because of the first stress of steel tube arch rib by method of arch first and beam late. This method without support construction meets the navigation requirements and has great social benefits and has great social benefits. The conclusion can be applied to similar projects.