基于径向索张拉原理的弦支穹顶结构施工技术研究

发布时间：2018-04-02 22:18

本文选题：弦支穹顶　切入点：索张拉　出处：《大连理工大学》2015年硕士论文

【摘要】：随着科技的不断发展和现代化安装技术水平的不断提高,空间大跨度结构在日常生活中的使用也在逐步增多。弦支穹顶结构是一种柔性和刚性都很好的新型复合结构,其最大的优点是网壳和索结构的结合,首先是对张拉结构的引入,使得整体网壳在受力及强度方面都有所改善,同时提高了结构的整体稳定性。另一方面由于单层网壳结构代替了索穹顶的上部结构,大大降低了建筑的设计分析困难和现实操作难度,目前弦支穹顶结构已实际应用在很多大型场馆及工业建筑中,它的应用前景得到了广泛的推广。本文通过对大连市体育馆工程的主题结构——弦支穹顶索结构的张拉详细情况,提出了较为合理的索结构张拉方案。其中预应力拉索施工是这个工程的最大特色和难点。在工程施工前我们要会同设计院根据结构特点进行深化设计,并做好仿真计算等准备工作。通过有限元计算软件的计算,对整个施工过程进行仿真模拟,最大程度的保证施工及使用的安全性。此外,在预应力拉索张拉施工前,弦支穹顶结构的刚度还不太稳定,为了使整体结构的受力符合设计及使用要求,使得各段环向拉索能够承受相同的拉力,因此在张拉时必须同时进行索力监测和起拱值监测。借助于光纤光栅传感系统的结构健康监测确立了整个张拉过程的安全保障机制,通过结构健康监测对索力、撑杆受力、和整体结构的位移和温度等物理量的分析控制来反映整个结构的安全状态。通过本课题的研究,能对今后国内大型场馆弦支穹顶结构的张拉施工提供数据保障及借鉴依据,具有良好的研究及应用前景。
[Abstract]:With the development of science and technology and the improvement of modern installation technology, the use of space long-span structures in daily life is increasing gradually.The chord dome structure is a new type of composite structure with good flexibility and rigidity. Its greatest advantage is the combination of the latticed shell and the cable structure. Firstly, the introduction of the tensioning structure improves the stress and strength of the whole latticed shell.At the same time, the overall stability of the structure is improved.On the other hand, because the single-layer latticed shell structure replaces the superstructure of cable dome, it greatly reduces the difficulty of design analysis and practical operation of the building. At present, the chord dome structure has been applied in many large-scale stadiums and industrial buildings.Its application prospect has been widely popularized.In this paper, a more reasonable tensioning scheme of cable structure is put forward through the detailed tensioning of the main structure of Dalian Gymnasium project, which is the cable structure of the chord dome.The construction of prestressed cable is the biggest characteristic and difficulty of this project.Before the construction of the project, we should work with the design institute to deepen the design according to the structural characteristics, and do well in the preparation of simulation calculation.Through the calculation of finite element calculation software, the whole construction process is simulated and the safety of construction and use is guaranteed to the greatest extent.In addition, the stiffness of the dome structure is not very stable before the construction of prestressed cable. In order to make the force of the whole structure meet the requirements of design and application, the cable can bear the same tensile force.Therefore, cable force monitoring and arch value monitoring must be carried out simultaneously during tension.With the help of the structural health monitoring of fiber Bragg grating sensing system, the security mechanism of the whole tensioning process is established, and the cable force and the force of the bracing rod are subjected to the structural health monitoring.And the displacement and temperature of the whole structure are analyzed and controlled to reflect the safety state of the whole structure.Through the research of this subject, it can provide the data guarantee and reference basis for the tension construction of the chord dome structure of the domestic large stadiums in the future, and has a good research and application prospect.
【学位授予单位】：大连理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU765

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