某钢管混凝土劲性骨架拱桥外包混凝土多工作面浇注受力研究

发布时间：2018-05-18 12:11

本文选题：钢管混凝土劲性骨架 + 多工作面浇注　；参考：《广西大学》2016年硕士论文

【摘要】：随着大跨度拱桥发展与需求,钢管混凝土劲性骨架拱桥的应用越来越广泛,其劲性骨架拱圈施工控制关键在于外包混凝土的浇注。外包混凝土采用多工作面浇注方法施工,其劲性骨架受力对称均匀,劲性骨架应力分配均匀,变形较小,有较好的调载效果,而分环多工作面浇注调载效果主要由工作面划分与纵向分段共同决定。为此本文对某钢管混凝土劲性骨架拱桥主桥拱圈外包混凝土多工作面浇注过程其结构受力与变形进行计算分析。主要研究内容与结论有：通过分析无调载分环连续浇注外包混凝土过程结构受力情况,结合影响线理论分析其变形与应力变化规律与最不利状态,为多工作面浇注方法设计提供依据。分析4工作面、6工作面浇注和8工作面浇注对主拱圈线形与应力的调载效果,逐步对工作面划分进行优化,得到结论：根据影响线合理分配影响线正、负应力区域的工作面数量,使正负应力能有效相互平衡,才能达到最佳的调载效果；本文研究对象外包混凝土浇注最优工作面划分为6工作面。以控制变量方法比较7个不同的多工作面浇注模型结构受力情况,总结纵向分段与工作面划分之间相互关系及其对施工控制效果影响,得到结论：在变形控制方面,4工作面浇注有一定的优化效果,但不能满足线形控制要求；6工作面、8工作面及10工作面浇注均对主拱圈线形起到很好的控制效果,在拱顶最终挠度控制上,细分纵向段即纵向总段数越多其最终挠度越小。在应力控制方面,在相同的工作面划分下,细分纵向分段可优化调载效果。结合工作面划分与纵向分段的分析研究得,在设计多工作面浇注方案时,应先结合影响线理论合理地划分工作面,再综合考施工控制、施工工期和经济等方面要求合理划分纵向段。结合计算结果与比较分析,本文推荐研究对象采用6工作面18段浇注外包混凝土。
[Abstract]:With the development and demand of long-span arch bridge, the application of concrete-filled steel tube rigid frame arch bridge is more and more extensive. The key of construction control of rigid frame arch ring is the pouring of concrete. In the construction of outsourced concrete with multi-face pouring method, the stiffness skeleton is symmetrical and uniform, the stress distribution of the stiffness skeleton is uniform, the deformation is small, and the load regulation effect is better. The effect of pouring load regulation is mainly determined by working face division and longitudinal section. In this paper, the stress and deformation of concrete filled steel tube structure are calculated and analyzed during the pouring process of the arch ring of a steel tube reinforced concrete arch bridge. The main research contents and conclusions are as follows: by analyzing the stress situation of the concrete structure during continuous pouring with unadjusted load and ring, combined with the theory of influence line, the deformation and stress variation law and the most disadvantageous state of the concrete are analyzed. It provides the basis for the design of multi-face pouring method. This paper analyzes the effect of pouring on main arch ring alignment and stress in No. 4 working face No. 6 and working face No. 8, and gradually optimizes the division of working face. The conclusion is: according to the reasonable distribution of influence line, the influence line is positive. The number of working faces in the negative stress area can balance the positive and negative stresses effectively to achieve the best load regulation effect. The best working face of outsourced concrete pouring is divided into 6 working faces in this paper. By using the method of control variable, the stress of 7 different multi-face pouring models is compared, and the relationship between longitudinal segment and working face partition and its influence on construction control effect are summarized. The conclusion is that the pouring of No. 4 working face has certain optimum effect in deformation control, but it can not meet the requirements of linear control, but the pouring in No.6 and 10 working faces has a good control effect on the main arch ring shape. In the final deflection control of the vault, the more the total longitudinal segment is, the smaller the final deflection is. In the aspect of stress control, the effect of load regulation can be optimized by subdividing longitudinal segment under the same working face division. Combined with the analysis of working face division and longitudinal section, it is concluded that in designing the pouring scheme of multi-face, the working face should be rationally divided with the theory of influence line, and then the construction control should be comprehensively tested. The construction period and economy require reasonable division of the longitudinal section. Combined with the results of calculation and comparative analysis, this paper recommends that the research object should be cast out concrete in 18 sections of 6 working face.
【学位授予单位】：广西大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：U445.57;U448.22

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