悬索桥主缆施工参数及温度校准研究

发布时间：2018-06-01 01:21

本文选题：悬索桥 + 主缆　；参考：《长安大学》2014年硕士论文

【摘要】：近年来随着大跨径悬索桥在我国的蓬勃发展，该桥型越来越受到工程界的重视和青睐。悬索桥主要由主缆、主塔、加劲梁及吊索等结构组成，其中主要结构受拉、材料利用效率较高。主缆材料常采用高强钢丝，比起其他材料更能经济合理地适用于修建大跨径桥梁。通常考虑大跨径悬索桥柔性较高的特点，其线形易受现场施工条件、临时设施以及环境温度的影响，所以悬索桥施工控制的关键在于对主缆线形的精确计算，这也是近年来悬索桥施工控制的研究成为热点问题的主要原因之一。本文是围绕桥梁结构监控工作而展开的，重点针对宜昌市庙嘴大江悬索桥进行分析。全文应用BNLAS软件，对单跨838m悬索桥采用分段悬链线理论进行施工控制计算。线形计算的主要内容包括：主缆、吊杆、背索、扣索的无应力下料长度。通过计算成桥合理线形，反推结构空缆线形并对跨中标高及各索鞍预偏值进行计算。具体针对悬索桥主缆施工特点、受力特点，对大跨径悬索桥主缆施工监控中的若干问题进行研究，，着重分析了不同温度效应下主缆施工控制参数、索股架设施工控制方面的内容。研究了不同温度下索股架设对主索鞍偏位的影响，探讨了索股架设过程中遇到的问题及对策，并对主缆架设的控制成果进行分析预判。在理论分析与实际计算的基础上，提出了大跨径悬索桥施工控制的部分参考意见。这些结论以期为该类桥型设计、施工提供可行的参考和借鉴，同时为大跨径悬索桥在建设过程中的监控提供有效依据。
[Abstract]:In recent years, with the vigorous development of long span suspension bridge in our country, the bridge type has been paid more and more attention and favor by the engineering circles. The suspension bridge is mainly composed of main cable, main tower, stiffened beam and sling, among which the main structure is pulled and the material utilization efficiency is high. High-strength steel wire is often used in main cable materials, which is more economical and reasonable than other materials in building long-span bridges. Considering the characteristics of high flexibility of long-span suspension bridge, the alignment of suspension bridge is easy to be affected by site construction conditions, temporary facilities and ambient temperature, so the key of construction control of suspension bridge is to calculate the main cable shape accurately. This is one of the main reasons why the construction control of suspension bridge has become a hot issue in recent years. This paper focuses on the bridge structure monitoring work, focusing on Yichang Miaozui Dajiang suspension bridge. Using BNLAS software, the construction control calculation of single span 838m suspension bridge is carried out by using the theory of segmental catenary. The main contents of linear calculation include: main cable, suspender rod, back cable, buckle cable. Through the calculation of the reasonable line shape of the bridge, the empty cable shape of the backward thrust structure is calculated, and the elevation in the span and the pre-deflection value of each cable saddle are calculated. According to the construction characteristics and stress characteristics of the main cable of the suspension bridge, this paper studies some problems in the construction monitoring of the main cable of the long-span suspension bridge, and emphatically analyzes the construction control parameters of the main cable under different temperature effects. Construction control of cable strands erection. The effect of cable strands erection on the saddle deviation of main cables at different temperatures is studied, the problems encountered in the process of cable strands erection and the countermeasures are discussed, and the control results of main cable erection are analyzed and forecasted. On the basis of theoretical analysis and practical calculation, some references for construction control of long span suspension bridge are put forward. These conclusions are expected to provide a feasible reference and reference for the design and construction of this type of bridge, and provide an effective basis for the monitoring and control of the long-span suspension bridge in the course of construction.
【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】：U448.25

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