采用悬臂浇筑与劲性骨架法施工的大跨径混凝土拱桥施工稳定性研究

发布时间：2018-02-23 02:29

本文关键词： 悬臂浇筑劲性骨架外包混凝土浇筑非线性稳定　出处：《重庆交通大学》2014年硕士论文　论文类型：学位论文

【摘要】：国内建造大跨径钢筋混凝土拱桥通常采用缆索吊装法,为满足吊装承载力要求,需要将拱圈人为分段以减轻吊重,这样显著降低了拱圈的整体性,容易在后期运营期间产生裂缝。国外往往采用悬臂浇筑法,而对于更大跨径的拱桥,为减小扣塔及扣锚索用钢量和悬臂浇筑拱圈的施工风险,又发展使用悬臂浇筑法和劲性骨架组合法,后文简称为组合法。为丰富我国混凝土拱桥施工方法,促进混凝土拱桥事业的发展,有必要研究和借鉴国外组合施工法。研究的内容包含广泛,而稳定性是整个施工过程安全性的基本保证,本文以此为出发点,研究组合法施工阶段的稳定性,给出了考虑几何材料双重非线性的计算结果,并对比了不同施工方案的稳定性计算结果,最后进行施工阶段稳定性影响参数分析。具体开展了工作如下： ①针对采用悬臂浇筑与劲性骨架施工的钢筋混凝土拱桥建立板梁联合模型。分析研究各施工方案的稳定系数变化规律,以此对施工过程提出建议。 ②研究了考虑几何和材料的双重非线性对稳定安全系数影响程度。 ③对比分段悬拼与整体提升两种施工劲性骨架方案的稳定性。 ④拟定了四种外包混凝土浇筑方案,分别计算了稳定安全系数,并进行了对比评价。 ⑤进一步对拱圈混凝土强度等级,主弦杆,平联的刚度进行稳定参数分析,以确定各设计参数对施工阶段稳定的影响大小。
[Abstract]:In order to meet the requirements of hoisting capacity, the arch rings need to be divided artificially to reduce the lifting load, which can significantly reduce the integrity of the arch rings, in order to meet the requirements of hoisting capacity, the cable hoisting method is usually used in the construction of long span reinforced concrete arch bridges in China. It is easy to produce cracks during the later period of operation. In foreign countries, cantilever pouring method is often used, and for larger span arch bridges, in order to reduce the construction risk of steel and cantilever pouring arch ring for buckling tower and anchor cable, In order to enrich the construction methods of concrete arch bridges in China and promote the development of concrete arch bridges, the cantilever pouring method and the rigid skeleton combination method are also used. It is necessary to study and learn from foreign combined construction methods. The contents of the study are extensive, and the stability is the basic guarantee of the safety of the whole construction process. The calculation results considering the double nonlinearity of geometric materials are given, and the stability calculation results of different construction schemes are compared. Finally, the influence parameters of stability in construction stage are analyzed. The detailed work is as follows:. The main results are as follows: 1. The slab-beam joint model is established for reinforced concrete arch bridge with cantilever pouring and rigid skeleton construction. This paper analyzes and studies the variation law of the stability coefficient of each construction scheme, and puts forward some suggestions for the construction process. (2) the influence of the double nonlinearity of geometry and material on the stability safety factor is studied. 3 comparing the stability of two kinds of construction stiffness skeleton schemes: segmental suspension and integral lifting. 4. Four kinds of outsourced concrete pouring schemes were worked out, and the stability safety factors were calculated, and compared and evaluated. (5) the stability parameters of arch ring concrete strength grade, main chord and flat joint stiffness are analyzed to determine the influence of each design parameter on the stability of construction stage.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U448.22

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