大跨椭圆形弦支穹顶结构设计与施工研究
发布时间：2018-11-21 15:42
【摘要】：随着我国国民经济的快速发展,公共体育事业也日益蓬勃,各种大跨空间结构应运而生。弦支穹顶结构以其造型新颖、结构通透、节省钢材、稳定性能好等诸多优点在各类公共体育建筑中广泛应用,目前国内外已经建成的弦支穹顶结构近几十例。本文以天津市宝坻区体育馆弦支穹顶结构为研究对象,对大跨椭圆形弦支穹顶结构的设计及施工中的几个关键问题进行研究。首先对弦支穹顶结构进行静力、动力性能进行研究,建立结构的静、动力有限元模型,考察其在静力、地震作用下的变形性能及内力分布特点,对结构设计提出建议。着重考察撑杆长度及预应力对该结构静、动力性能的影响。其次,对结构进行施工全过程分析,通过分析工程特点初步确定“满堂脚手架支撑、分三级张拉完成预应力”的施工方案。采用有限元分析软件MIDAS/gen,运用张力松弛法,对该施工方案进行施工过程仿真模拟。分析施工过程中环索内力、径向拉杆内力、网壳杆件内力及整体结构位移的变化规律。确定比较合理的施工方案,为安全施工提供理论保障;同时为监测点的布置提供了理论依据。最后,对索撑铸钢节点进行断裂性能研究,对其进行不同工况下的极限承载力分析,同时通过SMCS与VGM两种微观断裂预测模型对索撑铸钢节点进行单调荷载下的断裂预测,确定索撑铸钢节点的断裂部位、破坏模式以及极限承载力。本文对大跨椭圆形弦支穹顶结构设计及施工中的几个关键问题进行了研究,以期为该类结构的应用提供借鉴。
[Abstract]:With the rapid development of our national economy, public sports is booming day by day, and various large-span spatial structures emerge as the times require. The chord dome structure has been widely used in various kinds of public sports buildings because of its novel shape, transparent structure, saving steel, good stability and so on. At present, there are dozens of cases of the dome structure built at home and abroad. Taking the dome structure of Tianjin Baodi Gymnasium as the research object, this paper studies several key problems in the design and construction of the long-span elliptical domes. Firstly, the static and dynamic behavior of the dome structure is studied, the static and dynamic finite element models of the structure are established, the deformation performance and internal force distribution characteristics under static and earthquake action are investigated, and some suggestions for structural design are put forward. The influence of strut length and prestress on the static and dynamic performance of the structure is investigated. Secondly, through the analysis of the whole construction process of the structure, the construction scheme of "full hall scaffold support and three stage tension to complete prestress" is preliminarily determined by analyzing the engineering characteristics. The finite element analysis software MIDAS/gen, is used to simulate the construction process by tension relaxation method. The variation law of internal force of ring cable, internal force of radial pull rod, internal force of reticulated shell member and displacement of whole structure are analyzed. The reasonable construction scheme is determined to provide the theoretical guarantee for safe construction and the theoretical basis for the layout of monitoring points at the same time. Finally, the fracture behavior of cable cast steel joint is studied, and the ultimate bearing capacity under different working conditions is analyzed. At the same time, the failure prediction of cable cast steel joint under monotonic load is carried out by two micro fracture prediction models, SMCS and VGM. The fracture position, failure mode and ultimate bearing capacity of cable-supported cast steel joint are determined. In this paper, several key problems in the design and construction of large span elliptical domes are studied in order to provide reference for the application of this kind of structures.
【学位授予单位】：河北工程大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU399;TU765
[Abstract]:With the rapid development of our national economy, public sports is booming day by day, and various large-span spatial structures emerge as the times require. The chord dome structure has been widely used in various kinds of public sports buildings because of its novel shape, transparent structure, saving steel, good stability and so on. At present, there are dozens of cases of the dome structure built at home and abroad. Taking the dome structure of Tianjin Baodi Gymnasium as the research object, this paper studies several key problems in the design and construction of the long-span elliptical domes. Firstly, the static and dynamic behavior of the dome structure is studied, the static and dynamic finite element models of the structure are established, the deformation performance and internal force distribution characteristics under static and earthquake action are investigated, and some suggestions for structural design are put forward. The influence of strut length and prestress on the static and dynamic performance of the structure is investigated. Secondly, through the analysis of the whole construction process of the structure, the construction scheme of "full hall scaffold support and three stage tension to complete prestress" is preliminarily determined by analyzing the engineering characteristics. The finite element analysis software MIDAS/gen, is used to simulate the construction process by tension relaxation method. The variation law of internal force of ring cable, internal force of radial pull rod, internal force of reticulated shell member and displacement of whole structure are analyzed. The reasonable construction scheme is determined to provide the theoretical guarantee for safe construction and the theoretical basis for the layout of monitoring points at the same time. Finally, the fracture behavior of cable cast steel joint is studied, and the ultimate bearing capacity under different working conditions is analyzed. At the same time, the failure prediction of cable cast steel joint under monotonic load is carried out by two micro fracture prediction models, SMCS and VGM. The fracture position, failure mode and ultimate bearing capacity of cable-supported cast steel joint are determined. In this paper, several key problems in the design and construction of large span elliptical domes are studied in order to provide reference for the application of this kind of structures.
【学位授予单位】：河北工程大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU399;TU765
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