基于CFD技术建筑结构表面风压风场模拟研究

发布时间：2018-02-17 03:04

本文关键词： 风荷载数值模拟典型建筑平均风压系数风压风场　出处：《河北工程大学》2017年硕士论文　论文类型：学位论文

【摘要】：《建筑结构荷载规范》明确规定了风荷载在建筑结构抗风设计中的重要角色,近几年来各种形式的超高层建筑,大跨度结构越来越多的出现在人们的视野中,而这类建筑对风作用特别敏感,风荷载在其设计荷载中甚至起到决定性的作用,结构的抗风设计是这类建筑的一个非常重要的课题。作为风洞试验研究风荷载的一个辅助手段,风荷载数值模拟技术在结构抗风设计中逐渐扮演越来越重要的角色,由于其具有一些显著优点,比如经济性、灵活性、时效性以及较强的模拟性,使得风荷载数值模拟在研究建筑结构表面风压风场中具有很高的工程现实意义。本文基于CFD数值模拟技术,在Fluent软件平台上对典型的结构进行了风荷载数值模拟,通过分析得出一些规律,具体工作及结论如下:(1)首先说明结构抗风的重要性,介绍国内外风工程的研究现状以及研究方法。然后介绍风特性和钝体绕流,计算流体力学CFD的基本理论,从而引出应用CFD技术,基于Fluent平台对典型的建筑物进行风荷载数值模拟的可行性。(2)对凹形平屋顶立体结构进行数值模拟,得出不同湍流模型下各立面的风压分布云图,各测点的压力值,各立面的风荷载体型系数,然后与规范值比较,得出用Fluent软件进行风荷载数值模拟的可行性。(3)以H型建筑物为研究对象,首先进行不同风向角下风压分布研究,分析各种风向角下测点的风压分布规律;然后设置四种典型工况对研究对象分别数值模拟得出各种工况下风压风场分布规律,从而为相似建筑设计中遇到的抗风问题提供参考。
[Abstract]:The Code of load for Building structures clearly stipulates the important role of wind load in the wind resistant design of building structures. In recent years, more and more long-span structures have appeared in the sight of people in various forms of super-tall buildings. But this kind of building is especially sensitive to wind action, and wind load plays a decisive role in its design load. The wind resistant design of structure is a very important subject in this kind of building. It is an auxiliary means of wind tunnel test to study wind load. Wind load numerical simulation technology has gradually played an increasingly important role in wind resistant design of structures, because of its obvious advantages, such as economy, flexibility, timeliness and strong simulation. The numerical simulation of wind load is of great practical significance in the study of wind field on the surface of building structure. Based on CFD numerical simulation technology, the numerical simulation of wind load on typical structure is carried out on the platform of Fluent software. By analyzing some laws, the concrete work and conclusions are as follows: (1) first, the importance of wind resistance of structures is explained, and the research status and research methods of wind engineering at home and abroad are introduced. Then, the wind characteristics and the flow around the blunt body are introduced. The basic theory of computational fluid dynamics (CFD), and the feasibility of numerical simulation of wind load on typical buildings based on CFD technology based on Fluent platform are introduced. The numerical simulation of concave flat roof structure is carried out. The wind pressure distribution cloud map of each elevation, the pressure value of each measuring point, the wind load shape coefficient of each elevation under different turbulence models are obtained, and then compared with the standard values. The feasibility of numerical simulation of wind load with Fluent software is obtained. Taking H type building as the research object, the distribution of wind pressure under different wind direction angles is studied, and the wind pressure distribution law of measuring points at various wind direction angles is analyzed. The distribution of wind pressure and wind field under various working conditions is obtained by numerical simulation of four typical working conditions, which provides a reference for the wind resistance problems encountered in similar building design.
【学位授予单位】：河北工程大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU312.1

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