【作者】 陈兴刚；

【导师】 董石麟；

【作者基本信息】 浙江大学 ， 结构工程， 2004， 硕士

【摘要】 鸟巢形国家体育场是2008年北京奥运会的中标方案，其屋盖主体结构实际上是两向不规则斜交的平面桁架系组成的椭圆平面网架结构，每榀桁架与内环相切或接近相切，不妨称其为鸟巢形网架。这是一种新的网架结构形式，迄今为止对这种结构的研究在国内外还不曾有过。因此，系统、深入地研究该种结构的力学性能具有重要的理论意义和实用价值。 本文研究了圆形平面的鸟巢形网架，分析了结构构形，它可由统一的一类平面桁架系组成。对于特定边界条件的鸟巢形网架，本文提出了简化计算法和相应的计算公式，可以方便地计算网架各杆件的内力和节点挠度。 具体研究了结构体系在竖向荷载作用下的内力、位移等静力特性，得到了结构杆件内力的分布情况、桁架节点竖向位移大小，以达到对结构体系静力特性有全面的了解。 研究了鸟巢形网架结构的自振特性，给出了其各阶频率及对应的振型，随后研究了不同参数对自振特性的影响，对边界约束、不同体系两二个参数变化进行分析。 利用振型分解反应谱法研究了结构在常遇地震下的线性抗震性能，得到动内力的分布规律。采用时程分析法分析该结构在常遇地震作用下的结构响应，同时与反应谱分析结果作比较，得到了该种结构体系应采用时程分析法进行动力分析的结论。 论文最后对上述研究内容及成果作了简单的总结，并指出进一步研究的方向和具体亟待完成的工作。更多还原

【Abstract】 The bird-nest-patterned stadium is the successful bid scheme for 2008 Olympic Games in Peking. The major structure of its roof is an elliptic plane grid structure which consists of several plane trusses irregularly crossed in two directions. Each truss is tangential or tangential approximately to the internal ring. It is thus named as a bird-nest-patterned grid structure. Up to now, no studies on this type of structure have been carried out at home and abroad. Thus, it is important to study the structural performances in theory and engineering.In this paper a circular bird-nest-patterned grid structure consists of some identical plane trusses is first investigated in the aspects of form and load behavior. Then the simplified calculation method for such structures with special boundary condition is proposed. Using the simplified method and derived formula, the internal force of each bar and displacement of each node can be obtained conveniently.Circular bird-nest-patterned grid structure is discussed about its static behavior when acted by .vertical loads. The internal force of bar and displacement of node are studied. The distributing of internal force and vertical displacement of truss node is analyzed. In order to roundly analyze the mechanical property, its internal force and displacement is discussed systematically.The vibration characteristic of certain model is analyzed. Frequency, vibration shapes and stiffness distributing of the structure are find out. The influence on vibration characteristic acted by difference including boundary constrain and different form is studied..Vibration shapes-separation-spectra-method is adopted to analyze the dynamics behavior of circular bird-nest-patterned grid structure under the common earthquake, The law of dynamic, internal force is obtained. The step-by-step integration procedure is adopted to analyze the dynamic response of circular bird-nest-patterned grid structure under common earthquake, compared with analysis result by Vibration shapes-separation-spectra-method, the conclusion that time-history method should be adopted to analyze dynamic characteristic of this structure is obtained.Finally, some conclusions are summarized and the topics for further research are put forward to.更多还原