斜拉扣索调整南盘江特大桥拱圈的结构应力

发布时间：2019-04-02 15:36

【摘要】：为保证南盘江特大桥主拱圈安全顺利的施工,分别研究了六工作面法和斜拉扣索加多工作面组合法分环浇筑钢管混凝土劲性骨架主拱圈外包混凝土过程,分析了采用两种方法施工的结构瞬时应力和永存应力以及变形的变化规律,并对比分析了结构实际施工过程中的受力和变形。研究结果显示:六工作面加2组斜拉扣索、每组扣索索力3 000 k N能够较好地调整南盘江钢管混凝土劲性拱桥结构的瞬时应力和永存应力,可以将拱脚截面管内混凝土最大瞬时拉应力降低60%,永存压应力降低40%,并保持其他截面应力在《混凝土结构设计规范》(GB50010-2010)规范容许范围内;将拱顶最大瞬时挠度从-140 mm增加至-200 mm,但仍保持结构变形的平顺,避免了产生过大的反复变形。实际施工效果证实了斜拉扣索的有效调载作用。
[Abstract]:In order to ensure the safe and smooth construction of the main arch ring of Nanpanjiang Bridge, the process of concrete-filled steel tube (CFST) rigid skeleton main arch ring encased by six working surface method and inclined tension fastening cable plus multi-face composition method was studied. The variation rules of instantaneous stress, permanent stress and deformation of the structure constructed by two methods are analyzed, and the stress and deformation in the actual construction process of the structure are compared and analyzed. The results show that the instantaneous stress and the permanent stress of the concrete filled steel tube rigid arch bridge structure in Nanpanjiang River can be well adjusted by adding two groups of slant tension cables in the sixth working face, each group with a cable force of 3 000 KN. The maximum instantaneous tensile stress and permanent compressive stress of concrete can be reduced by 60% and 40% respectively, and other cross-section stresses can be kept within the allowable range of the Code for Design of concrete structures (GB50010-2010). The maximum instantaneous deflection of the arch is increased from-140 mm to-200 mm, but the deformation of the structure is still smooth, thus avoiding excessive repeated deformation. The actual construction effect proves the effective load-adjusting effect of the slant-tension fastening cable.
【作者单位】：广西大学土木建筑工程学院;工程防灾与结构安全教育部重点实验室;广西建筑工程质量检测中心;
【基金】：中国工程院咨询研究项目(2016-XY-22) 广西自然科学基金项目(2013GXNSFAA019306) 广西防灾减灾与工程安全重点实验室系统性研究项目(2013ZDX02) 广西交通科技项目[2012(26-35)]
【分类号】：U441.5

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