大跨连廊钢结构风载流固耦合数值模拟分析

发布时间：2018-10-25 17:37

【摘要】：大跨度的钢结构连廊体型复杂属于柔性结构,连廊的刚度远小于两侧连接建筑物的刚度,放置于空中时抗风的设计非常重要。这种结构在风荷载作用下非常敏感,同时复杂结构与规则对称的建筑在风压系数上差别很大。因此,为保证结构在施工和使用时更加安全,对大跨连廊钢结构在风载作用下的风压分布规律的研究尤为重要。本文以阜新市“两馆一心”为研究背景,以规划博物馆和市民活动中心之间的大跨度空中连廊钢结构为研究对象。应用ADINA有限元软件建立结构体和流体场的流体—结构耦合(FSI)模型,分别对结构的模态、不同风速工况和不同风荷载情况进行动力分析。计算得出在不同风荷载情况下的位移和风压系数分布。通过以上研究工作,得出以下结论：(1)基于流体力学,建立三种风速工况,在6个风向角作用下得到风压系数等值线。风压系数在结构表面分布比较均匀,整体表现为迎风面受压为正,其中中间部位最大,两侧逐渐减小,背风面风压系数为负。(2)分析三种风速工况在不同风向角作用下结构表面的风压系数的分布。不同风速的风压系数曲线表现为基本重合,推断风压系数分布与风速无关,与风向角有关。同时进一步验证了风压系数求得的正确行和可靠性。(3)考虑狭缝效应对连廊结构的影响,分析不同荷载情况对结构的平均风压系数产生的影响。迎风面风压值明显增高,背风面的两侧风压值变化较为明显。
[Abstract]:The large span steel structure veranda is a flexible structure with complex shape. The stiffness of the corridor is much smaller than that of the connecting buildings on both sides. It is very important to design the wind-resistant structure when placed in the air. This kind of structure is very sensitive to wind load, and the complex structure is very different from the regular symmetrical building in wind pressure coefficient. Therefore, in order to ensure that the structure is more safe in construction and use, it is particularly important to study the wind pressure distribution law of long-span corridor steel structure under the action of wind load. This paper takes Fuxin City "two Pavilions as one mind" as the research background, takes the large-span steel structure of the aerial corridor between the planning museum and the citizen activity center as the research object. The fluid-structure coupled (FSI) model of structure and fluid field is established by using ADINA finite element software, and the dynamic analysis of the structure mode, different wind speed working condition and different wind load is carried out respectively. The distributions of displacement and wind pressure coefficient under different wind loads are calculated. The conclusions are as follows: (1) based on hydrodynamics, three wind speed conditions are established, and the isoline of wind pressure coefficient is obtained under the action of six wind direction angles. The distribution of wind pressure coefficient on the surface of the structure is more uniform, the overall performance is that the upwind surface is under positive pressure, the middle part of the wind pressure coefficient is the largest, and the two sides of the wind pressure coefficient decrease gradually. The wind pressure coefficient on the leeward surface is negative. (2) the distribution of the wind pressure coefficient on the structure surface under different wind direction angles is analyzed. The curve of wind pressure coefficient of different wind speed is basically coincident. It is inferred that the distribution of wind pressure coefficient is independent of wind speed and is related to wind direction angle. At the same time, the correctness and reliability of the wind pressure coefficient are further verified. (3) considering the influence of slit effect on the corridor structure, the influence of different loads on the average wind pressure coefficient of the structure is analyzed. The wind pressure on the upwind surface is obviously higher than that on the both sides of the leeward surface.
【学位授予单位】：辽宁工程技术大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU393.3;TU312.1

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