【作者】 姚云龙；

【导师】 董石麟；

【作者基本信息】 浙江大学 ， 结构工程， 2014， 博士

【摘要】 本文根据乐清市体育中心体育馆和游泳馆采用的结构形式,综合给出并研讨了一种具有内外环桁架的新型内外双重张弦网壳结构,且外张弦体系可穿越网壳,内环桁架可采用上弦梁下弦索(梁)的空腹桁架。这种空间结构与传统辐射式张弦梁结构或弦支网壳相比,可为场馆内部提供更多的使用空间,增加了后排座位的可视范围,结构受力更为合理,技术经济指标优异。为更好地理解这种新型空间张弦网壳结构的受力特性并促进其工程应用,本文从形状确定、力学性能、稳定性、地震响应及模型试验等方面进行了系统研究。第1章总结了大跨度空间结构的发展历程和分类,系统地回顾了张弦梁与环形平面张力索桁结构的发展历史、工程应用和研究现状,并从以上两种结构的形体对这种新型张弦网壳结构进行了对比分析和说明。与此同时,对本文的研究内容做了简单介绍。第2章归纳和总结了具有内外环桁架的新型张弦网壳结构的结构形式,从网壳网格布设、径向索与网壳径向梁的相对位置、网壳的高斯曲率、内外环曲线形状、及内孔采用不同结构的内外双重张弦网壳结构等五个方面对这种新型张弦网壳结构进行了分类。第3章对空间结构形状确定问题的研究方法进行了归纳和总结。以肋环型内外双重张弦网壳结构为例,对这种新型张弦网壳结构的形状确定问题进行了研究。采用局部分析法的思想,从节点平衡关系入手,给出了内外双重张弦网壳结构体系的初始预内力简捷计算法及其计算用表；在原有数值计算法的基础上,提出了改进的数值计算法,并对计算过程参数的选取进行了讨论。通过算例比较了以上两种找形方法的计算结果,说明了方法的正确性。第4章系统地研究了新型空间张弦网壳结构的静力性能,以具有内外环桁架的肋环型张弦网壳结构为例,利用大型有限元软件ANSYS进行了结构在满跨和半跨荷载下的静力性能分析；并对张拉索矢高、网壳曲率、网壳面内径向支撑、环形水平桁架以及网壳网格形式等主要参数对结构受力性能的影响进行了分析。第5章以具有内外环桁架的肋环型张弦网壳结构为例,对结构进行了满跨和半跨荷载作用下结构的稳定性能分析；对张弦网壳结构的张拉索矢高、网壳曲率、网壳面内径向支撑、环形水平桁架以及网壳网格形式等主要参数进行了分析；讨论了缺陷分布及大小对结构稳定性能的影响；比较了肋环型、葵花型及施威德勒型等三种张弦网壳结构的稳定性及经济性。第6章以具有内外环桁架的肋环型张弦网壳结构为例,研究这一结构的动力特性和抗震性能。对该结构进行自振特性分析；利用EI-Centro波对具有内外环桁架的肋环型张弦网壳结构进行了地震响应时程分析；并研究了张拉索矢高、网壳曲率、网壳面内径向支撑以及环形水平桁架等参数对其动力性能的影响。第7章以乐清市体育中心体育馆屋盖结构为背景,按照1：15比例设计和制作了缩尺模型。对其进行了下部索杆预应力张拉试验、静力加载试验、局部断索(杆)试验和自振特性测试,并对试验实测数据与理论分析结果进行了比较和分析。第8章对本文研究的内容进行了归纳和总结,指出了具有内外环桁架的新型空间张弦网壳结构仍需要解决的一些问题,明确了今后的研究方向。更多还原

【Abstract】 A new type of spatial beam string structure(BSS), called latticed shell string structure with inner and outer truss torus, is proposed according to the roof of Yueqing Municipal Gymnasium. Compared with traditional radial BSS or suspendome, latticed shell string structure with inner and outer truss torus increase the visual ranges of rear seats in gymnasium. For a better understanding of mechanical properties and a promoting of the engineering application, the new structure is studied systematically from several aspects, such as shape determination, mechanical properties, stability analysis, seismic response and model experiment.Chapter I briefly summarizes the history and classifications of long-span spatial structures and reviews the development history, project applications and research status of BSS and annular tensile cable-truss structures. This new latticed shell string structure can be understanded from the above two structures. A brief introduction of the content of this paper is given.Chapter II summarizes the structure forms of latticed shell string structure with inner and outer truss torus. Six ways are given to classify this new type of structure, such as the relative position between the radial beams of latticed shell and radial cables, the grid form of latticed shell, radial beam curvatures of latticed shell, the cable forms, the strut arrangement and the inner hole covered by different space structures.Chapter III summarizes the shape determination methods of space structure and the shape determination problem of ribbed double inner and outer beam string structure is discussed. Based on the local analysis method and the nodal equilibrium equation, the simplified calculation method and computation table for initial prestress of ribbed latticed shell string structure is proposed. Numerical algorithm is introduced and some suggestions for improvement are put forward and the parameter selection of calculation processing is discussed. Two examples are investigated by the above two methods and the calculation results are compared. The results confirm the feasibility of two methods.Chapter IV studies systematically on static performances of the new latticed shell string structure. Ribbed annular space latticed shell string structure is taken as an example and its static behavior under full-span and half-span load is analyzed by ANSYS. Besides, the effects of prestress level and types of latticed shell are investigated.Chapter Ⅴ studies the stability of ribbed annular space latticed shell string structure systematically under full-span and half-span load. Besides, the effects of prestress level and types of latticed shell on the stability are investigated. The effect of initial imperfection on the stability are studied. The stability and economics of three types of latticed shell string structure, ribbed patterned, sunflower patterned and schwedler patterned, are studied.Chapter Ⅵ analyzes the dynamic properties and seismic behaviors of ribbed annular space latticed shell string structure. The modal analysis is carried out with the latticed shell string structure. The seismic response for the latticed shell string structure with inner and outer truss torus is studied subjected to El-Centro wave. Moreover, the effects of prestress level and types of latticed shell on vibration modes and seismic response are investigated.In Chapter Ⅶ, a1/15scale model of the roof of Yueqing Municipal Gymnasium was constructed. The experiment includes simulation of tension process, static loading, local cable broken and vibration characteristics. The experimental data measured and theoretical results are compared and analyzed.Chapter Ⅷ summarizes all the researches in this paper and lists some problems to be solved in the future for latticed shell string structure with inner and outer truss torus.更多还原