采用组合法施工的主拱圈线形与应力控制技术研究

发布时间：2019-03-13 21:08

【摘要】：近30多年来,国内采用支架现浇法、缆索吊装法、劲性骨架法和转体施工等方法建造了数量众多的大跨径混凝土拱桥。国外大跨度混凝土拱桥自上世纪60年代起,大多采用悬臂浇筑法或悬臂浇筑与劲性骨架相组合的施工方法。进入本世纪,国内采用悬臂浇筑法建造了3座钢筋混凝土拱桥,但对悬臂浇筑与劲性骨架组合施工法尚未开展过研究。本文依托贵州省交通运输厅科技项目“悬浇钢筋混凝土箱型拱桥设计与施工技术研究”(2011-122-034),以主跨210m的夜郎湖大桥对研究对象,开展如下研究工作:①在收集整理国内外研究成果的基础上,借鉴斜拉桥、连续梁桥及其他桥型悬臂浇筑施工所采用的控制方法及计算分析理论,开展了钢筋混凝土拱桥悬臂浇筑施工控制方法的研究,建立一套适于钢筋混凝土拱桥悬臂浇筑施工的控制体系。②根据夜郎湖大桥悬臂浇筑施工过程,结合混凝土抗拉性能低的特点,较为深入地开展了“带有预测机制的应力控制前进分析算法”的研究,以悬浇阶段主拱圈混凝土上、下缘应力为约束变量,结合当前已成型节段扣索力,得到即将张拉扣索的索力可行域,利用该可行域可自动判断出扣索张拉方式(拆除已张拉扣索,整节段一次浇筑、一次张拉,分级浇筑、分次张拉)及张拉力。利用ANSYS的APDL语言,开发了钢筋混凝土拱桥采用悬臂浇筑与劲性骨架组合施工的计算分析程序。③开展了劲性骨架架设及外包混凝土浇筑阶段的力学分析,探讨了外包混凝土浇筑方式对主拱圈线形与应力的影响规律。
[Abstract]:In the past 30 years, a large number of long-span concrete arch bridges have been constructed by means of cast-in-place support method, cable hoisting method, rigid skeleton method and rotating construction method. Since 60's of last century, most of the long-span concrete arch bridges abroad have adopted cantilever pouring method or cantilever casting combined with rigid skeleton construction method. In this century, three reinforced concrete arch bridges have been constructed by cantilever casting method, but the combined construction method of cantilever casting and rigid skeleton has not been studied. Based on the Science and Technology Project "Design and Construction Technology Research of suspended reinforced concrete Box Arch Bridge" (2011 / 12 / 034), this paper takes the 210m Yilang Lake Bridge as the research object. The following research work is carried out as follows: 1 on the basis of collecting and arranging the domestic and foreign research results, the control method and calculation analysis theory used in the construction of cable-stayed bridge, continuous beam bridge and other bridge cantilever casting are used for reference. The construction control method of cantilever pouring of reinforced concrete arch bridge is studied and a set of control system suitable for cantilever pouring construction of reinforced concrete arch bridge is established. 2According to the construction process of cantilever pouring of Yulanghu Bridge, Based on the characteristics of low tensile performance of concrete, the research on "forward analysis algorithm of stress control with predictive mechanism" is carried out in this paper. The stress on the upper and lower edge of the main arch ring concrete in the suspension stage is taken as the constraint variable, and the stress on the bottom edge of concrete is considered as the constraint variable. Combined with the current formed segment fastening force, the feasible zone of tension is obtained, and the tension mode of the cable can be automatically judged by using this feasible region (removing the tension fastener, pouring the whole segment once, pulling once, pouring grade by stage, etc., and using this feasible region) can be used to determine the tension mode of the cable automatically (removing the tension fastener, casting the whole segment once, pulling once, pouring grade by grade. Split tension) and tension. Using APDL language of ANSYS, the calculation and analysis program of reinforced concrete arch bridge using cantilever casting and rigid skeleton combination construction has been developed. 3 the mechanical analysis of rigid frame erection and outside concrete pouring stage has been carried out. The influence of concrete pouring mode on the shape and stress of the main arch ring is discussed.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U445.4;U448.22

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