大跨度钢结构全过程施工监测及分析研究
发布时间：2018-07-29 21:11
【摘要】：对大跨钢结构而言,由于其结构施工过程庞大复杂,施工方法和施工工艺繁琐,在施工阶段出现风险概率要比其他结构要高。而大型复杂结构的一旦发生事故,其影响和后果是极其严重的,因此,有必要针对大型空间结构进行施工全过程监测及模拟分析以了解结构在施工阶段的力学特性,同时研究结构施工过程中的一系列相关问题。 由于受到施工阶段现场条件的制约,国内对于大跨空间结构的监测大多是针对施工阶段的某一过程进行监测,如卸载过程、提升过程、开合过程,而目前对于结构施工全过程的监测和研究很少。为此,课题组开发了基于无线传感网络的大跨结构实测系统,并运用该系统对绍兴体育场钢结构施工全过程的应力、温度、位移进行监测。 本文根据施工方案建立钢结构施工阶段有限元模型,采用生死单元法对体育场施工全过程模拟分析,研究结构施工全过程的应力曲线变化规律,给出了施工完成后所测构件应力的绝对值大小,总结了影响体育场施工阶段应力变化的主要因素。 针对影响体育场施工阶段应力变化的两个因素(拆除支撑和温度变化)分别进行分析研究。根据卸载方案建立体育馆卸载过程的有限元模型,对主体钢结构进行有限元模拟,由于施工阶段结构边界支承条件难以确定,本文给出了不同支座约束条件下的有限元理论计算值,将模拟值与实测数据进行比较,分析其变化规律。同时,对体育场卸载阶段的温度变化以及支座水平位移进行监测,并采用有限元模型进行卸载期间温度效应和卸载不同步性的模拟计算。 对于体育场钢结构在施工过程中特殊气候条件(持续高温和低温)下的温度变化所产生的温度应力,本文以大量实测数据为依据,详细研究了温度与应力的关系及温度变化所产生温度应力的大小,给出了结构在不均匀温度场下的实测温度分布规律,通过有限元模拟分析结构在不均匀温度场作用下的温度应力,得到构件的应力变化理论值,将其与实测数据对比。 通过介绍绍兴体育场钢结构屋盖的施工监测实践,希望针对大型空间钢结构施工监测工作提出一些有益的探索,为将来开展全面意义上的大型空间钢结构施工诊断积累经验。
[Abstract]:For large-span steel structures, the construction process is huge and complex, the construction method and construction technology is cumbersome, and the risk probability in the construction stage is higher than that of other structures. However, the impact and consequence of large-scale complex structures are extremely serious once accidents occur. Therefore, it is necessary to monitor and simulate the whole construction process of large space structures in order to understand the mechanical characteristics of the structures in the construction stage. At the same time, a series of related problems in the process of structure construction are studied. Because of the restriction of site conditions in construction stage, the monitoring of large span spatial structure in China is mostly aimed at a certain process in construction stage, such as unloading process, lifting process, opening and closing process, etc. At present, the monitoring and research on the whole process of structure construction is rare. Therefore, a large span structure measurement system based on wireless sensor network has been developed and used to monitor the stress, temperature and displacement of the steel structure of Shaoxing Stadium during the whole construction process. In this paper, the finite element model of steel structure in construction stage is established according to the construction plan, and the whole process of stadium construction is simulated and analyzed by the birth and death element method, and the variation law of stress curve in the whole construction process of the structure is studied. The absolute value of the stress of the members measured after construction is given, and the main factors influencing the stress change in the construction stage of the stadium are summarized. This paper analyzes and studies two factors which affect the stress change in the construction stage of the stadium (demolition bracing and temperature change). According to the unloading scheme, the finite element model of the unloading process of gymnasium is established, and the finite element simulation of the main steel structure is carried out. In this paper, the theoretical calculation values of finite element under different support constraints are given. The simulated values are compared with the measured data, and the variation law is analyzed. At the same time, the temperature change and the horizontal displacement of the support are monitored during the unloading stage of the stadium. The finite element model is used to simulate the temperature effect and the dissynchrony of the unloading during the unloading period. Based on a large number of measured data, the temperature stress of stadium-steel structure under special climatic conditions (continuous high temperature and low temperature) during construction is studied in this paper. The relationship between temperature and stress and the magnitude of temperature stress caused by temperature change are studied in detail. The measured temperature distribution law of the structure under non-uniform temperature field is given. Through the finite element simulation analysis of the temperature stress of the structure under the action of the inhomogeneous temperature field, the theoretical value of the stress variation of the component is obtained and compared with the measured data. Through introducing the construction monitoring practice of the steel structure roof of Shaoxing Stadium, this paper hopes to put forward some beneficial exploration for the construction monitoring work of the large space steel structure, so as to accumulate experience in the construction diagnosis of the large space steel structure in the future.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU393.3;TU758.11
本文编号：2154032
[Abstract]:For large-span steel structures, the construction process is huge and complex, the construction method and construction technology is cumbersome, and the risk probability in the construction stage is higher than that of other structures. However, the impact and consequence of large-scale complex structures are extremely serious once accidents occur. Therefore, it is necessary to monitor and simulate the whole construction process of large space structures in order to understand the mechanical characteristics of the structures in the construction stage. At the same time, a series of related problems in the process of structure construction are studied. Because of the restriction of site conditions in construction stage, the monitoring of large span spatial structure in China is mostly aimed at a certain process in construction stage, such as unloading process, lifting process, opening and closing process, etc. At present, the monitoring and research on the whole process of structure construction is rare. Therefore, a large span structure measurement system based on wireless sensor network has been developed and used to monitor the stress, temperature and displacement of the steel structure of Shaoxing Stadium during the whole construction process. In this paper, the finite element model of steel structure in construction stage is established according to the construction plan, and the whole process of stadium construction is simulated and analyzed by the birth and death element method, and the variation law of stress curve in the whole construction process of the structure is studied. The absolute value of the stress of the members measured after construction is given, and the main factors influencing the stress change in the construction stage of the stadium are summarized. This paper analyzes and studies two factors which affect the stress change in the construction stage of the stadium (demolition bracing and temperature change). According to the unloading scheme, the finite element model of the unloading process of gymnasium is established, and the finite element simulation of the main steel structure is carried out. In this paper, the theoretical calculation values of finite element under different support constraints are given. The simulated values are compared with the measured data, and the variation law is analyzed. At the same time, the temperature change and the horizontal displacement of the support are monitored during the unloading stage of the stadium. The finite element model is used to simulate the temperature effect and the dissynchrony of the unloading during the unloading period. Based on a large number of measured data, the temperature stress of stadium-steel structure under special climatic conditions (continuous high temperature and low temperature) during construction is studied in this paper. The relationship between temperature and stress and the magnitude of temperature stress caused by temperature change are studied in detail. The measured temperature distribution law of the structure under non-uniform temperature field is given. Through the finite element simulation analysis of the temperature stress of the structure under the action of the inhomogeneous temperature field, the theoretical value of the stress variation of the component is obtained and compared with the measured data. Through introducing the construction monitoring practice of the steel structure roof of Shaoxing Stadium, this paper hopes to put forward some beneficial exploration for the construction monitoring work of the large space steel structure, so as to accumulate experience in the construction diagnosis of the large space steel structure in the future.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU393.3;TU758.11
【参考文献】
相关期刊论文 前10条
1 李宏男,李东升;土木工程结构安全性评估、健康监测及诊断述评[J];地震工程与工程振动;2002年03期
2 李宝桂，，吴栋材;大型斜拉桥高塔墩施工中的变形观测[J];工程勘察;1996年01期
3 陈国栋;;南通体育场钢结构开合屋盖设计与施工介绍[J];钢结构;2005年06期
4 张玉玲;曾志斌;王丽;;国家体育场大跨度钢结构温度监测系统研究及其在卸载时的应用[J];钢结构;2008年07期
5 林错错;王元清;石永久;;露天日照条件下钢结构构件的温度场分析[J];钢结构;2010年08期
6 陈建稳;侯红青;樊祜壮;;日照条件下空间钢结构温度效应研究[J];钢结构;2011年12期
7 郭彦林,崔晓强;大跨度复杂钢结构施工过程中的若干技术问题及探讨[J];工业建筑;2004年12期
8 郭彦林;刘学武;;大型复杂钢结构施工力学问题及分析方法[J];工业建筑;2007年09期
9 刘学武;郭彦林;张庆林;刘禄宇;;CCTV新台址主楼施工过程结构内力和变形分析[J];工业建筑;2007年09期
10 王秀丽;仲海民;;大跨度钢屋盖卸载方案及现场监测[J];兰州理工大学学报;2012年06期
相关博士学位论文 前1条
1 方胜利;大型悬挑钢结构施工关键技术研究[D];武汉理工大学;2011年
本文编号：2154032
本文链接：https://www.wllwen.com/guanlilunwen/chengjian/2154032.html
