几种常见形体大跨空间屋盖风场风压和等效静风荷载的数值模拟分析

发布时间：2018-07-09 22:45

本文选题：大跨空间屋盖 + 风压分布　；参考：《上海交通大学》2015年硕士论文

【摘要】：大跨空间屋盖以其造型丰富、材料节省、可利用空间大、适应性强等特点备受青睐,在机场航站楼、展览馆、体育馆、工业厂房等大型建筑中广泛应用。然而此类结构质量轻、跨度大、柔性大、自振频率低,结构对风荷载敏感,风荷载往往是结构设计的控制荷载。风荷载作为一种随机动力荷载,其作用下的结构动力响应计算涉及结构动力学、随机振动、风荷载特性以及风与结构耦合的相互作用。为了便于设计人员掌握风荷载的设计方法,风工程研究者提出等效静风荷载的概念(Equivalent Static Wind Load,ESWL)。本文从大跨空间结构工程抗风问题出发,阐述了大跨空间结构风压风场数值模拟方法,以架空碟形空间结构为例,分析了风向角、支撑柱高度、上下碟面矢跨比对碟形空间结构风压分布及风致合力的影响;针对大跨拱形屋盖、大跨多折面形屋盖,分析了屋盖风压分布规律;利用MATLAB自编程序实现了基于谐波叠加法的风速时程数值模拟,以此为数值风洞入口边界条件,基于FLUENT软件平台对结构进行非稳态分析,获得结构动力时程风荷载;利用ANSYS软件建立结构有限元模型,结合有限元动力时程分析法,对结构进行风振响应分析;在此基础上,结合结构特定时刻的瞬时风压分布,得到单目标等效静风荷载;给出了多目标等效静风荷载加权组合系数的定义,基于荷载响应相关系数对单目标等效静风荷载进行组合,获得了多目标等效静风荷载;以大跨开敞式拱形屋盖结构和多折面形屋盖结构实际工程为例,计算获得多目标等效静风荷载分布,并与动力时程分析结果进行对比,验证了本文多目标等效静风荷载方法的正确性。
[Abstract]:Long-span space roof has been widely used in airport terminal, exhibition hall, gymnasium, industrial workshop and other large buildings because of its rich shape, saving materials, large usable space, strong adaptability and so on. However, such structures are light in weight, large in span, flexible, low in natural vibration frequency and sensitive to wind loads, which are often the control loads of structural design. As a kind of random dynamic load, the dynamic response calculation of structure under the action of wind load involves structural dynamics, random vibration, wind load characteristics and the interaction between wind and structure. In order to facilitate designers to master the design method of wind load, wind engineering researchers put forward the concept of equivalent wind load (ESWL). In this paper, the numerical simulation method of wind pressure and wind field of large span space structure is expounded based on the problem of wind resistance in large span space structure engineering. The wind direction angle and the height of supporting column are analyzed with the example of aerial disc space structure. The wind pressure distribution and wind-induced force of the disk-shaped spatial structure are analyzed, and the wind pressure distribution of the large-span arched roof and the large-span multi-facet roof is analyzed. The numerical simulation of wind speed time history based on harmonic superposition method is realized by using MATLAB software, which is regarded as the entry boundary condition of numerical wind tunnel. The unsteady state analysis of the structure is carried out based on fluent software platform, and the dynamic time-history wind load of the structure is obtained. The finite element model of the structure is established by using ANSYS software, and the wind-induced vibration response of the structure is analyzed by using the finite element dynamic time-history analysis method, and on this basis, the equivalent static wind load with single objective is obtained by combining the instantaneous wind pressure distribution of the structure at a specific time. The definition of multi-objective equivalent static wind load weighted combination coefficient is given. Based on the load response correlation coefficient, the single-objective equivalent static wind load is combined and the multi-objective equivalent static wind load is obtained. Taking the large span open arch roof structure and multi-folded roof structure as examples, the equivalent static wind load distribution of multi-objective is calculated and compared with the results of dynamic time-history analysis. The validity of the multi-objective equivalent static wind load method is verified.
【学位授予单位】：上海交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU312.1

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