大跨木结构单层球形网壳风振响应以及整体稳定性分析

发布时间：2018-09-14 09:31

【摘要】：近年来，大跨网壳结构在体育馆、工业厂房、博物馆和车站等建筑中得到了大量的应用。虽然现在大跨度结构一般都是采用钢结构，但是木材由于其重量轻且具有一定的装饰性，所以在大跨结构中也有一定的使用。无论是什么材料所构成的大跨网壳结构，由于其质量轻，刚度小，，频率集中等特点，都属于风敏感结构。现在很多关于大跨结构的风振响应的研究是通过准定常假定或者一些修正的假定将风速向风压转换，这对于大跨度结构的适用性值得商榷。对于网壳特别是单层网壳的整体稳定性的研究，主要是针对钢结构网壳，而对于木结构单层网壳的研究基本没有。本文主要以天津欢乐谷85m跨单层球形木结构网壳为例，研究木结构网壳的风振响应和整体稳定性。本文基于白噪声滤波法（AR法）解决脉动风入口的输入问题，通过大涡模拟（LES）得到网壳上各节点的风压时程，然后通过瞬态动力学计算得到网壳各节点的风振系数。与风洞试验结果对比表明本文方法的计算结果和试验结果吻合较好，按该方法计算大跨结构风振响应是可行的。通过本文方法，论文讨论了木结构网壳在不同竖向荷载、阻尼、边界条件和荷载分布等参数作用下对于网壳风振系数的影响。对于整体稳定性，本文通过计算木结构球形单层网壳在半跨活荷载以及全跨活荷载下的屈曲特征值，无缺陷的稳定承载力和引入初始缺陷后的网壳承载力，讨论了网壳的初始缺陷、荷载分布和非线性对于木结构网壳的整体承载力的影响。本文采用的分析方法和各种影响因素的对比结果，以及风振系数和整体稳定性荷载的取值规律，可供类似结构设计作为参考。
[Abstract]:In recent years, large span latticed shell structures have been widely used in gymnasiums, industrial buildings, museums and stations. Although steel structures are generally used in long-span structures nowadays, wood is also used in long-span structures because of its light weight and decorative properties. The large-span latticed shell structure, no matter what material it is, belongs to wind-sensitive structure because of its light weight, low stiffness and concentrated frequency. At present, many researches on the wind-induced vibration response of long-span structures are based on quasi-steady assumptions or some modified assumptions to convert wind speed to wind pressure. The applicability of this study to long-span structures is open to question. The overall stability of latticed shells, especially single-layer latticed shells, is mainly focused on steel latticed shells, but there is no research on single-layer latticed shells of wood structures. In this paper, the wind-induced vibration response and overall stability of single-layer spherical wooden shell with 85 m span in Huanghue Valley of Tianjin are studied as an example. Based on the white noise filtering (AR) method, the input problem of the pulsating wind inlet is solved. The wind pressure time history of each node on the reticulated shell is obtained by large eddy simulation (LES), and the wind-induced vibration coefficient of each node in the latticed shell is calculated by transient dynamics calculation. The comparison with the wind tunnel test results shows that the calculated results are in good agreement with the experimental results, and it is feasible to calculate the wind-induced vibration response of long-span structures by using this method. Through this method, the paper discusses the influence of different vertical load, damping, boundary condition and load distribution on the wind vibration coefficient of the latticed shell of wood structure. For global stability, the buckling eigenvalues of spherical single-layer latticed shells of wooden structures under semi-span live load and full-span live load are calculated, the load-carrying capacity of no-defect stable shell and the latticed shell with initial defect are calculated in this paper. The effects of initial defects, load distribution and nonlinearity of latticed shells on the overall bearing capacity of latticed shells are discussed. The analytical method adopted in this paper, the comparative results of various influencing factors, as well as the values of wind-induced vibration coefficient and global stability load, can be used as a reference for the design of similar structures.
【学位授予单位】：重庆大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU399;TU311.3

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