钢管混凝土刚架系杆拱桥施工监控的研究和应用建筑与土木工程专业论文.docxVIP

内蒙古科技大学硕士学位论文 - I - 摘 要 钢管混凝土刚架系杆拱桥是我国近年来广泛应用的一种新桥型，由于其自重 轻、强度高且受力合理、施工方便，是大跨度拱桥比较理想的结构形式。 钢管混凝土刚架系杆拱桥的施工监控是一个复杂的、多影响因素的过程，特 别是钢管拱肋的吊装和钢管内灌注混凝土的施工过程。钢管拱肋的每个阶段的吊 装均会影响到前面已经吊装完成的拱肋节段，使已成型节段的受力状态发生改 变，从而导致拱肋线形的改变。本文结合钢管混凝土刚架系杆拱桥的工程实例， 采取正装计算法，运用 MIDAS CIVIL 软件对拱桥的拱肋、横梁、系杆、吊杆等 结构在施工过程中和成桥状态下的结构内力、应力和变形进行了模拟计算。重点 对钢管拱肋在安装、灌注混凝土、成桥状态的拱肋线形和应力进行模拟计算，对 每个施工阶段制定监控方案，并通过实测施工过程的数据和理论计算数据进行对 比分析，使得钢管混凝土拱桥的施工过程有比较准确的控制参考依据。然后改变 施工方案，采用悬臂吊装施工法建立有限元模型，将分析结果与原模型的理论值 和监控实测值进行对比分析，再次证明施工监控的重要性和可参考性。 本文首先通过对实际工程的钢管混凝土刚架系杆拱桥进行施工监控，其次对 施工方案进行优化并建立有限元模型。从实际施工和理论分析两方面对钢管混凝 土拱桥施工监控进行研究，为今后类似桥型的施工监控提供借鉴和参考。 关键词：钢管混凝土刚架系杆拱桥；施工过程监控；应力控制；有限元分析 - II - Abstract Concrete Filled Steel Tubular (CFST) Arch Bridge is a new type that is widely used in China. Because of its light weight, high strength, reasonable force and constructing convenience, It is one ideal structure form of long span bridge. The process of construction monitoring on CFST is complex and might be affected by lots of factors, especially the process of the hoisting of steel tube arch rib and the pouring of steel pipe concrete. The arch rib lift at each stage will affect the previously completed ones, whose stress state will be different and thus lead to a change in the arch rib curve. Combining engineering instances of CFST arch bridge, Firstly, The paper utilizes MIDAS CIVIL to simulate the internal force, stress and deformation on the structures such as arch rib, beam, and boom in the construction process and under the status of the completed bridge. Secondly, the paper emphasis on simulate the arch rib axis, stress and deformation on the process of the hoisting of steel tube arch rib , the pouring of steel pipe concrete and under the status of the completed bridge. Thirdly, it makes corresponding monitoring schemes for each construction stage. Then a comparative analysis is made between the actual construction process data and the theoretical calculation data, which provides more accurate reference basis to the construction proc