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为使天津科技馆球幕电影厅的设计做到技术先进、经济合理,分析了四种常用穹顶网壳的特点和受力性能,提出短程线穹顶网壳具有网格划分均匀,结构刚度大,对非对称荷载适应性强等优点.通过在天津科技馆设计中的应用表明,短程线穹顶网壳是一种较优的结构形式. 相似文献
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奥运羽毛球馆张弦穹顶基于整体稳定的优化设计 总被引:5,自引:0,他引:5
以2008年奥运会羽毛球比赛馆张弦穹顶结构为例,对张弦穹顶和单层网壳进行了内力、节点位移、特征值屈曲和非线性屈曲的荷载位移平衡路径的跟踪分析,阐述了张弦穹顶结构的优越性。对联方型、肋环型、肋环斜杆型张弦穹顶的分析比较表明,联方型网格经济合理,更适用于张弦穹顶结构。分析了网格密度、矢跨比、撑杆长度、初始缺陷、钢索预应力等设计参数的影响,得到了具有工程实用意义的结论。分别以网壳杆件内力和节点位移为目标函数编制了优化程序,研究了钢索合理预应力度的确定方法。 相似文献
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《建筑结构学报》2017,(1)
以在寒冷地区建造一座跨度800 m城市穹顶为设定工程背景,研究该穹顶双层网壳结构的静力及稳定性能。对凯威特型平行弦三向交叉桁架球面网壳、凯威特型角锥球面网壳、凯威特型角锥悬链面网壳以及短程线型角锥球面网壳四种方案在相同荷载、相同几何参数条件下的结构性能进行研究,对结构跨度、矢跨比、结构厚度、网格径向分割数、支承方式以及材料强度等参数进行了600余个算例分析,得到结构刚度、稳定性、经济性等指标随上述参数的变化规律,同时给出了各种结构方案的杆件截面尺寸。研究表明,凯威特型与短程线型网壳适合于跨度800 m结构,其中凯威特型角锥球面网壳结构性能相对较优。该研究成果可为超大跨度网壳结构方案的选型提供参考。 相似文献
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随着城市环境变化和现代工程技术发展,建造跨度1000 m级超大型城市穹顶以营造一个特定的区域小环境,逐渐成为现实需求。城市穹顶突破现有结构尺度极限,结构设计面临新的挑战。对城市穹顶的概念进行了探讨,以在寒冷地区建造一座跨度800 m城市穹顶为设定工程背景,对采用刚性结构、杂交结构、柔性结构以及组合结构等四大类结构体系共计13种结构方案进行选型研究。对比分析了结构刚度、稳定承载力和用钢量等指标,总结了跨度800 m各种结构方案性能特点,提出了可将K型角锥球面网壳、K型巨型网格结构以及索承网壳 双层网壳组合结构作为优选方案;并就超大跨度穹顶的建造与设计提出了材料轻质化、设计标准、抗风问题、温度场影响、结构形态学、建造可行性、围护结构、节能环保以及穹顶维护等9个方面的相关问题,以供进一步研究作为参考。 相似文献
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弦支穹顶是一种典型的由索、杆、梁单元组成的空间结构,可充分发挥预应力技术的优势来提高单层网壳的刚度和承载能力.近年来已有较多的研究和工程应用,如用于体育建筑、会展建筑等,但其建筑平面多为与穹顶球面(椭球面)网壳相应的圆形平面(椭圆形平面),比较单一,影响了推广应用范围.本文提出一种由上部单层柱面网壳和下部弦支体系组合而成矩形平面的弦支柱面网壳,对其结构型体进行了研究.根据单层柱面网壳网格类型和弦支形式提出了n环弦支单向斜杆正交正放网格型柱面网壳、n环弦支两向正交正放网格型柱面网壳、n环弦支联方网格型柱面网壳、n环弦支三向网格型柱面网壳等四种弦支柱面网壳.以单跨单波三环弦支单向斜杆正交正放网格型为例对弦支柱面网壳的受力特性进行了深入研究,探讨了预应力水平、杆件截面、矢跨比等参数变化对弦支柱面网壳内力和变位的影响,并对其特征值屈曲、非线性屈曲和基本模态进行了分析.分析研究结果表明,矩形平面的弦支柱面网壳是一种技术经济指标优越、有推广应用前景的新型空间结构. 相似文献
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绍兴金沙东方山水商务休闲中心水馆建筑造型为一体量巨大的椭球体。该椭球体中央区域形态扁平、受弯为主,壳体作用弱;周边部位曲率较大、呈压弯受力状态,壳体作用相对显著。巨大的跨度和扁平的形态给结构选型与设计带来了较大挑战。经过多方案比选和优化,最终采用由径向主桁架、中部环桁架、中央弦支穹顶、子区域单层联方网壳共同构成的钢桁架弦支穹顶组合网壳结构。重点阐述结构体系选型及优化的过程,介绍钢屋盖的结构布置、静动力特性、温度作用表现、整体稳定性和极限承载力。同时介绍支座及典型节点的设计与分析结果等。分析结果表明,选择钢桁架弦支穹顶组合网壳这一新型结构形式可有效满足超大跨度下的结构受力和建筑美观需要。 相似文献
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通过有计划地对400余例实际尺寸的施威德勒型单层球面网壳进行双重非线性全过程分析,求得网壳的极限承载力,系统地考察了初始缺陷和荷载不对称以及考虑材料非线性等因素对网壳稳定性能的影响,较全面了解了施威德勒型单层球面网壳弹塑性稳定的规律性,为此类网壳结构的工程实践提供了理论依据和设计参考。并得出以下几点结论:(1)为保证网壳的安全性,网壳的极限承载力应由双重非线性全过程分析确定。(2)施威德勒穹顶属于缺陷敏感性结构。(3)竖向荷载不对称分布对网壳极限承载力影响较小。(4)工程设计中应适当考虑支承条件变化对网壳极限承载力的影响。 相似文献
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联方型弦支穹顶研究 总被引:11,自引:1,他引:11
在分析天保中心弦支穹顶的工程实例及相关研究的基础上,提出了弦支穹顶的二阶段分析方法。采用二阶段分析方法,对选定的结构模型,与单层网壳相比较,分析了联方型弦支穹顶的结构性能。研究了不同矢跨比、不同撑杆长度、不同节点刚度等参数变化条件下联方型弦支穹顶的特性,同时考虑了不同的荷载组合情况。对联方型弦支穹顶进行了屈曲分析。研究分析结果表明弦支穹顶须按预应力模型进行分析;联方型弦支穹顶是一种高效的结构形式,其屈曲承载力大于相应的单层球面网壳;二阶段分析法是弦支穹顶一种有效的分析设计方法;较为浅平的弦支穹顶的拉索预应力应进行专项分析;撑杆较长有利于增大抵抗力并避免环向拉索的松弛;不对称荷载为主要工况时有必要对拉索的松弛进行专题校核分析。 相似文献
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Recent researches have demonstrated that bolt-ball joints have a certain amount of flexural stiffness, so they should be classified as semi-rigid joints and it is possible to apply them on single-layer latticed domes. In order to study the stability and stressed skin effect of the latticed domes with bolt-ball joints, a series of nonlinear full-produce analyses were conducted on the basis of the design of an 80 m diameter single-layer latticed dome with bolt-ball joints, which is the main structure of the Shenbei New District citizen fitness center in Shenyang, China. Above all, the moment-rotation relations for bolt-ball joints, which were established based on numerical results, were introduced into the latticed dome numerical model. Then, the nonlinear stability analyses for the latticed dome in different construction stages were carried out by the above-mentioned numerical model under vertical loads and horizontal wind loads. The mechanical behaviors discussed in this investigation including the stability and the ultimate bearing capacity of the latticed dome in different construction stages, and the influence of the stressed skin effect on the stability of the latticed dome with decorated plates. The result shows that: after being properly designed, the latticed dome with bolt-ball joints can exhibit a good mechanical performance, and this successful application of bolt-ball joints on the Shenbei New District citizen fitness center can set an example project for the design of single-layer latticed domes with semi-rigid joints; under vertical loads, it is more dangerous for the 75% complete latticed dome, while the dangerous construction stage for horizontal wind loads is the 50% completed latticed dome; the stressed skin effect can increase the stability of latticed domes. 相似文献
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Jianguo Cai Yixiang Xu Jian Feng Jin Zhang 《The Structural Design of Tall and Special Buildings》2013,22(8):677-686
The hybrid grid shell, made of quadrangular meshes diagonally stiffened by pre‐tensioned thin cables, is an attractive structural form in the design and construction of long‐span transparent glass roof structures. These hybrid structures are very slender and lightweight, and it is desirable to understand their detailed structural behavior. The mechanical characteristic of the hybrid structure was investigated based on a quadrangle of slats with cross cables. The construction of the design model for the glass roof was firstly described. Then, the static behavior and stability capacity of the hybrid grid dome and the corresponding single‐layer lattice dome were studied based on a finite element model. Moreover, the modal analyses of the two domes were carried out. The natural frequencies and the vibration modes of the domes were given to investigate the dynamic behavior of the hybrid grid dome. Finally, the effects of the asymmetric loads and rise‐to‐span ratios on the structural behavior were studied in detail. Copyright © 2011 John Wiley & Sons, Ltd. 相似文献