中国铁道科学2012，Vol.33Issue(4)：20-24,5.DOI:10.3969/j.issn.1001-4632.2012.04.04
预应力混凝土连续梁拱组合桥吊杆成桥索力计算及影响因素分析
Calculation of the Final Cable Force of the Hangers of PC ContinuousBeam-Arch Combination Bridge and Analysis of Its Influence Factors
摘要
Abstract
According to the structural characteristics of PC continuous beam-arch combination bridge and fully considering the carrying capacity of the girder, the step-by-step algorithm for calculating the final cable force of hangers was proposed based on specified section stress method. According to the stress control conditions of the girder sections, with the minimum total cable force of the hangers as the objective function, the cable force of the hangers was determined preliminary by adopting mathematical programming method and then was evenly adjusted using least square method. Accordingly) the reasonable final cable force of hangers was obtained. This method was applied to analyze the final cable force of the hangers of (62+132+62) m continuous beam-arch combination structure, the main bridge of Beijing-Hangzhou Canal of Su-Huai Railway. The effects of girder sectional dimension and construction methods on the final cable force of the hangers and the prestressed layout of girder were studied. The results show that, with the increase of beam height, the degree of the girder involved in the whole bridge force increases, the cable force of the hangers reduces and the load of arch rib decreases. With different construction methods, the final cable force of the hangers and the prestressed layout in the girder are also different When cast-in-place cantilever balance method is substituted by cast-in-situ support method for girder construction, the final cable force of the hangers increases, the number of prestressed steel strand for the girder reduces at the section of the middle support point whereas increases at the section of midspan.关键词
连续梁拱组合桥/预应力混凝土/吊杆/成桥索力/铁路桥Key words
Continuous beam-arch combination bridge/ Prestressed concrete/ Hanger/ Final cable force/ Railway bridge分类
交通工程引用本文复制引用
王文清,侯广伟..预应力混凝土连续梁拱组合桥吊杆成桥索力计算及影响因素分析[J].中国铁道科学,2012,33(4):20-24,5.基金项目
铁道部科技研究开发计划项目(2009G003-G) （2009G003-G）
