单塔单跨钢桁梁悬索桥的施工监控

发布时间：2018-06-08 07:14

本文选题：单塔单跨悬索桥 + 钢桁加劲梁　；参考：《重庆交通大学》2015年硕士论文

【摘要】：在我国已建成的悬索桥中,采用单塔单跨钢桁梁这种结构形式的较少,这种结构的施工监控经验更是不足。本文依托主跨为256米的西藏通麦特大桥,开展了单塔单跨钢桁梁悬索桥施工监控方面的计算分析和现场监控。取得了如下的主要成果:①应用有限元软件midas civil,考虑单塔单跨钢桁梁的结构特点,建立了通麦大桥的空间有限元模型。通过一次成桥的初始平衡状态分析试算,得到了可靠的有限元模型。②进行通麦特大桥的初始平衡状态分析,给出了主缆在空缆状态及成桥状态的线形,以及主缆及吊杆的无应力长度。通过与设计文件进行比对,说明了计算模型及计算结果的正确性。③对影响主缆线形的因素进行了计算,分析了跨度变化、温度变化对主跨主缆跨中标高的影响。通过主缆架设施工监控,通麦大桥主缆线形良好,误差满足规范要求。④通过对施工条件、钢桁梁架设顺序、桥面板铺装顺序、钢桁梁连接方式等的计算分析和综合研究,提出了从梁端开始吊装钢桁加劲梁节段直至B6节段处合拢、从跨中开始往两端对称铺装桥面板、采用分段刚接法的钢桁梁连接方式。经过主缆线形、吊杆索力、钢桁梁应力和标高等监测数据分析,验证了上述钢桁梁和桥面板施工顺序的合理性。⑤根据通麦特大桥的施工全过程计算分析得出的主索鞍预偏量,拟定了主索鞍分六次顶推施工的方案。通过将每一顶推阶段的实际顶推量与拟定顶推量对比分析,证明了拟定的主索鞍顶推方案的正确性。
[Abstract]:In the suspension bridges built in our country, the single tower and single span steel truss beam is used less, and the construction monitoring experience of this kind of structure is even less. Based on the 256m main span of Tongmai Bridge in Tibet, this paper carries out the calculation, analysis and on-site monitoring of construction monitoring of single-tower and single-span steel truss suspension bridge. The main achievements of this paper are as follows: 1. The spatial finite element model of Tongmai Bridge is established by using the finite element software midas civil and considering the structural characteristics of single tower and single span steel truss beam. By analyzing the initial equilibrium state of the bridge at one time, a reliable finite element model .2 is obtained for the initial equilibrium state analysis of the Tongmai Bridge, and the alignment of the main cable in the state of the aerial cable and the state of the bridge is given. And the stress-free length of the main cable and boom. By comparing with the design file, the correctness of the calculation model and the result of calculation is given to calculate the factors affecting the main cable shape, and the influence of the change of span and temperature on the winning height of the main cable span is analyzed. Through monitoring and controlling the construction of main cable erection, the main cable of Tongmai Bridge is in good shape, and the error meets the requirements of code .4 through the calculation, analysis and comprehensive study of the construction conditions, the erection order of steel truss beam, the paving sequence of deck slab, the connection mode of steel truss beam, etc. It is proposed that the steel truss beam should be hoisted from the end of the beam to the B6 section, and the bridge deck should be laid symmetrically at both ends from the middle of the span, and the steel truss beam should be connected by the method of section rigid connection. Through the analysis of main cable shape, cable force of suspender, stress and elevation of steel truss beam, the rationality of the construction sequence of the steel truss beam and deck slab is verified. 5. According to the calculation and analysis of the whole construction process of Tongmai Bridge, the pre-deflection of the main cable saddle is verified. The scheme of main cable saddle construction is worked out in six times. The correctness of the proposed scheme is proved by comparing the actual push amount of each push stage with the proposed one.
【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

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