某钢管混凝土劲性骨架拱桥外包混凝土连续浇注计算分析

发布时间：2018-04-08 19:22

  本文选题：钢管混凝土劲性骨架拱桥　切入点：斜拉扣挂　出处：《广西大学》2014年硕士论文

【摘要】：钢管混凝土劲性骨架拱桥是将钢管劲性骨架埋置于外包混凝土中,综合了钢管混凝土拱桥和钢筋混凝土拱桥的优点,主要应用于大跨径拱桥。劲性骨架外包混凝土体量巨大,施工过程中结构刚度和强度逐步形成,体系转换复杂、施工难度大,外包混凝土施工方法的选取至关重要。斜拉扣挂法通过施加斜向拱轴线上方的拉力,可以有效控制劲性骨架在连续浇筑外包混凝土过程中的应力和变形,为进一步研究特大跨径钢管混凝土劲性骨架拱桥外包混凝土斜拉扣挂法施工过程中的结构特性,保证期间结构的安全性和经济性,本文对某钢管混凝土劲性骨架拱桥主桥拱圈外包混凝土进行了斜拉扣挂法连续浇注的结构受力、变形的计算分析。通过对大桥无斜拉扣索连续浇注外包混凝土的有限元分析表明,不加斜拉扣索进行外包混凝土连续浇注,钢管混凝土劲性骨架的拱顶挠度产生较大反复,其中最大下挠37.9cm,最大上挠31cm；同时,劲性骨架的钢管和管内混凝土最大压应力分别达到422Mpa、47.0MPa,管内混凝土最大拉应力达到11.2MPa。结构应力(尤其是管内混凝土应力)远远超过其容许范围,过大的反复变形也对结构极为不利。对斜拉扣挂法连续浇筑底板外包混凝土计算分析,对比3组斜拉扣索与4组斜拉扣索调控的效果,结果表明,在4组斜拉扣索调控下,拱顶始终无上挠,变形反复较小,最大下挠21.Ocm；上下弦钢管、管内混凝土最大压应力分别为210MPa、8.2MPa,管内混凝土最大拉应力为1.04MPa。结构压、拉应力均在容许范围内,反复变形较小,斜拉扣挂法调控效果良好。
[Abstract]:CFST arch bridge is a steel skeleton embedded in concrete, the comprehensive advantages of CFST arch bridge and reinforced concrete arch bridge, mainly used in large span arch bridge reinforced concrete. The huge volume, in the construction process of the structural stiffness and strength gradually formed, system transformation is complex, difficult construction. It is very important to select the construction method of concrete cable-stayed suspension method. By applying the oblique arch axis above the pulling force, can effectively control the skeleton in the continuous casting process of concrete stress and deformation, for further research on the structural characteristics of the long-span CFST arch bridge concrete cable-stayed construction process in, to ensure the safety and economy during the period of structure, this paper of a CFST arch bridge's main bridge arch concrete for Cable structure hanging method of continuous casting stress, deformation analysis calculation. Through the finite element analysis of cable-stayed cable shows that continuous casting of outsourcing concrete on the bridge, and stayed buckle cable concrete continuous casting, vault deflection of CFST greatly again, one of the biggest deflection 37.9cm the maximum deflection, on 31cm; at the same time, concrete filled steel tube and steel frame of the maximum compressive stress reached 422Mpa, 47.0MPa respectively, the maximum tensile stress of concrete tube structure to 11.2MPa. stress (especially in concrete stress) exceeds the allowable range, large deformation of the structure is repeated the disadvantage. Cable hanging method calculation and analysis of continuous casting slab concrete, comparing the 3 groups and 4 groups of cable-stayed cable cable-stayed cable control effect, results show that in the 4 group of cable-stayed cable arch always under the control of supreme scratch, anti deformation The complex is smaller, maximum deflection of 21.Ocm; on the bottom steel tube, the maximum compressive stress of the concrete are respectively 210MPa, 8.2MPa, the maximum tensile stress of concrete pipe is 1.04MPa. structure pressure, tensile stress in the allowable range, repeated deformation and small cable-stayed suspension method control effect is good.

【学位授予单位】：广西大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U445.57;U448.22
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本文编号：1723021