整体吊装钢管混凝土系杆拱桥施工关键技术研究

发布时间：2018-06-29 22:40

本文选题：钢管混凝土系杆拱桥 + 整体吊装　；参考：《长安大学》2014年硕士论文

【摘要】：钢管混凝土系杆拱桥以良好的结构受力特性和美学价值，在我国公路桥梁中得到了广泛应用。当钢管混凝土系杆拱桥上跨既有高等级道路或高等级航道时，可采用浮吊整体吊装钢管拱肋和系梁劲性骨架的全新施工方法。整体吊装施工方法的关键技术主要包括合理施工状态确定、吊点位置选择及施工方案制定。本文对整体吊装钢管混凝土系杆拱桥施工关键技术进行了以下研究：（1）基于对钢管混凝土系杆拱桥施工技术的归纳总结，分析了目前国内钢管混凝土系杆拱桥整体吊装技术的现状，明确了整体吊装施工技术中需要解决的关键问题、研究目的和意义。（2）根据下承式钢管混凝土系杆拱桥的相关理论，对确定合理施工状态的基本原理进行分析，得出了合理成桥状态与合理施工状态的主要方法；基于吊点布置合理性不同评价准则，对比分析了各条准则的区别和适用条件。（3）以合理成桥状态的确定步骤为基础，研究了确定合理成桥状态的基本算法，提出了拱肋应力控制条件和弯矩可行域；以合理成桥状态为目标，采用正装迭代与影响矩阵相结合的方法，形成了合理吊杆张拉力的计算方法；根据钢管混凝土系杆拱桥结构分析基本理论，分析了施工阶段拱肋和预应力系杆的作用，明确了合理施工状态下预制拱肋标高和施工阶段预应力系杆张拉力计算方法。（4）结合工程实例，基于合理成桥状态和合理施工状态理论计算方法，通过建立有限元模型，计算了合理成桥状态，进而确定了合理施工状态下相应的拱肋预拱度和吊杆张拉力，验证本文提出的合理吊杆力计算方法的可行性和正确性。（5）通过对钢管混凝土系杆拱桥传力路径和受力特点的分析，明确了吊装过程不同吊点位置对拱肋力学性能的影响，提出了吊点位置的确定原则。通过对工程实例中整体吊装钢管拱肋及劲性骨架选取多个不同吊点位置进行试算，并将结果进行对比分析，确定了合理吊点位置并在依托工程中得到验证；提出了施工方案制定原则，结合实际施工场地和施工设备，，因地制宜制定了吊装方案。
[Abstract]:Concrete-filled steel tubular tied arch bridge has been widely used in highway bridges in China because of its good structural characteristics and aesthetic value. When the upper span of concrete-filled steel tubular tied arch bridge is on the existing high-grade road or high-grade channel, a new construction method of hoisting steel pipe arch rib and tie-in beam stiffness skeleton can be adopted. The key techniques of integral hoisting construction include the determination of reasonable construction state, the selection of hoisting point position and the formulation of construction scheme. In this paper, the key construction technology of concrete-filled steel tubular tied arch bridge is studied as follows: (1) based on the summary of construction technology of concrete-filled steel tubular tied arch bridge, This paper analyzes the present situation of integral hoisting technology of concrete-filled steel tubular tied arch bridge in China, and clarifies the key problems to be solved in the construction technology of integral hoisting. The purpose and significance of the research. (2) according to the theory of through concrete filled steel tube tied arch bridge, the basic principle of determining the reasonable construction state is analyzed, and the main methods of reasonable bridge completion and reasonable construction state are obtained. Based on the different evaluation criteria of the rationality of hanging point arrangement, the differences and applicable conditions of each criterion are compared and analyzed. (3) based on the steps of determining the reasonable bridge state, the basic algorithm for determining the reasonable bridge state is studied. The stress control conditions of arch rib and the feasible region of bending moment are put forward, and the reasonable tension calculation method of suspenders is formed by combining the formal iteration with the influence matrix, aiming at the reasonable state of the bridge. According to the basic theory of structure analysis of concrete-filled steel tubular tied arch bridge, the effect of arch rib and prestressed tie bar in construction stage is analyzed. The calculation method of prefabricated arch rib elevation and tensioning force of prestressed tie bar in construction stage under reasonable construction condition is defined. (4) based on the theoretical calculation method of reasonable bridge state and reasonable construction state, combined with engineering examples, By establishing the finite element model, the reasonable state of the bridge is calculated, and the corresponding pre-arch degree of arch rib and the tension force of the suspender are determined under the reasonable construction condition. The feasibility and correctness of the proposed method are verified. (5) through the analysis of the load transfer path and force characteristics of concrete-filled steel tubular tied arch bridge, The influence of different lifting point positions on the mechanical properties of arch ribs is clarified, and the determination principle of hoisting point position is put forward. Through the trial calculation of the hoisting steel pipe arch rib and the rigid skeleton in the engineering example, the results are compared and analyzed, and the reasonable lifting point position is determined and verified in the supporting project. The principle of construction scheme is put forward, and the hoisting scheme is made according to local conditions combined with actual construction site and construction equipment.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U445.4;U448.225

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