某超高层建筑风压的数值模拟研究
发布时间：2018-08-03 14:41
【摘要】：本文选择超高层建筑作为研究对象,此类建筑具有周期长、刚度小、受风载影响大等特点,为了保证结构安全和结构舒适度必须着重考虑风荷载的作用。因为现行规范中没有给出对于此类超高层建筑表面风压合适的计算方法,为了适应实际工程抗风设计的需求,需要利用计算风工程的方法获得比较准确的建筑物表面风压。 目前,已知的风工程的研究手段主要包括现场实测、风洞试验和数值模拟三种方法,本文采用数值模拟的方法对超高层建筑表面风压进行计算。风载数值模拟技术的理论基础是流体动力学和数值计算方法,数值模拟以反映流动风的质量、动量以及湍流脉动能量守恒的连续性方程和Navier-Stokes方程为基本控制方程,建立数学模型,通过不同的离散方法建立离散点的集合,求解这些离散点上变量间关系的代数方程组,从而获得流场的相关性质。 本文以武汉世茂锦绣长江项目二期A2地块1号楼1-3单元为计算实例,利用数值模拟方法,分别计算15种工况下建筑物周围绕流风场和建筑物表面风压的分布,主要研究内容为： 一、采用Standard κ-ε.RNG κ-ε.Realizable κ-ε.Standard κ-ω和SST κ-ω五种湍流模型对超高层建筑周围绕流风速场和结构表面风压做了研究,总结出采用不同湍流模型对数值模拟的影响；二、根据工程情况,采用基于压力的求解器进行结构风速场和结构表面风压计算,并比较了SIMPLE、 SIMPLEC和PISO三种算法的计算结果,总结出引入不同算法对数值模拟的影响；三、基于本工程为高雷诺数流动的考虑,分别采用不同壁面函数处理方法对结构风速场和结构表面风压做了研究,总结出引入不同壁面函数对数值模拟的影响；四、以45°为增量,比较不同风向角情况下超高层建筑周围绕流风场和结构表面风压值的变化,得到风速分布特性和表面风压分布规律,以作为该工程设计的参考资料。 通过以上分析研究,为超高层结构风荷载规范的完善、数值模拟研究中参数的设置以及结构抗风设计提出了建议,并对数值模拟方法在研究风载方面的应用做了总结和展望。
[Abstract]:In this paper, super-tall buildings are chosen as research objects. Such buildings have the characteristics of long period, small stiffness and large wind load. In order to ensure structural safety and structural comfort, the role of wind load must be considered. Because there is no suitable calculation method for the surface wind pressure of this kind of super high-rise building in the current code, in order to meet the demand of practical engineering wind resistant design, it is necessary to use the method of calculating wind engineering to obtain more accurate wind pressure on the surface of building. At present, the known research methods of wind engineering mainly include field measurement, wind tunnel test and numerical simulation. In this paper, the surface wind pressure of super high-rise building is calculated by numerical simulation. The theoretical foundation of wind load numerical simulation technology is hydrodynamics and numerical calculation method. Numerical simulation is based on the continuity equation and Navier-Stokes equation which reflect the conservation of wind mass, momentum and turbulent pulsation energy. The mathematical model is established and the set of discrete points is established by different discretization methods. The algebraic equations of the relations between variables on these discrete points are solved and the related properties of the flow field are obtained. In this paper, the numerical simulation method is used to calculate the wind field around the building and the wind pressure distribution on the surface of the building under 15 working conditions, taking the 1-3 unit of No. 1 Building in the second phase of the Shimao Jinxiu Yangtze River Project in Wuhan as an example, and the numerical simulation method is used to calculate the wind field around the building. The main research contents are as follows: first, five turbulence models, Standard 魏-蔚. RNG 魏-蔚. Realizable 魏-蔚. Standard 魏-蠅 and SST 魏-蠅, are used to study the wind velocity field around the super high-rise building and the wind pressure on the surface of the structure. The effects of different turbulence models on the numerical simulation are summarized. Secondly, according to the engineering conditions, the wind velocity field and surface wind pressure of the structure are calculated by using a pressure-based solver, and the calculation results of simple, SIMPLEC and PISO algorithms are compared. The influence of different algorithms on the numerical simulation is summarized. Thirdly, considering the high Reynolds number flow in this project, different wall function processing methods are used to study the wind velocity field and the surface wind pressure of the structure, respectively. The effects of introducing different wall functions on numerical simulation are summarized. Fourthly, the variation of wind field around the circumference of super high-rise building and the wind pressure on the surface of the structure is compared with the increment of 45 掳. The wind velocity distribution characteristics and surface wind pressure distribution rules are obtained, which can be used as reference materials for the design of the project. Through the above analysis and research, some suggestions are put forward for the improvement of wind load code for super high-rise structures, the setting of parameters in numerical simulation research and the design of wind resistance of structures. The application of numerical simulation method in wind load research is summarized and prospected.
【学位授予单位】：武汉理工大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU973.213
本文编号：2162070
[Abstract]:In this paper, super-tall buildings are chosen as research objects. Such buildings have the characteristics of long period, small stiffness and large wind load. In order to ensure structural safety and structural comfort, the role of wind load must be considered. Because there is no suitable calculation method for the surface wind pressure of this kind of super high-rise building in the current code, in order to meet the demand of practical engineering wind resistant design, it is necessary to use the method of calculating wind engineering to obtain more accurate wind pressure on the surface of building. At present, the known research methods of wind engineering mainly include field measurement, wind tunnel test and numerical simulation. In this paper, the surface wind pressure of super high-rise building is calculated by numerical simulation. The theoretical foundation of wind load numerical simulation technology is hydrodynamics and numerical calculation method. Numerical simulation is based on the continuity equation and Navier-Stokes equation which reflect the conservation of wind mass, momentum and turbulent pulsation energy. The mathematical model is established and the set of discrete points is established by different discretization methods. The algebraic equations of the relations between variables on these discrete points are solved and the related properties of the flow field are obtained. In this paper, the numerical simulation method is used to calculate the wind field around the building and the wind pressure distribution on the surface of the building under 15 working conditions, taking the 1-3 unit of No. 1 Building in the second phase of the Shimao Jinxiu Yangtze River Project in Wuhan as an example, and the numerical simulation method is used to calculate the wind field around the building. The main research contents are as follows: first, five turbulence models, Standard 魏-蔚. RNG 魏-蔚. Realizable 魏-蔚. Standard 魏-蠅 and SST 魏-蠅, are used to study the wind velocity field around the super high-rise building and the wind pressure on the surface of the structure. The effects of different turbulence models on the numerical simulation are summarized. Secondly, according to the engineering conditions, the wind velocity field and surface wind pressure of the structure are calculated by using a pressure-based solver, and the calculation results of simple, SIMPLEC and PISO algorithms are compared. The influence of different algorithms on the numerical simulation is summarized. Thirdly, considering the high Reynolds number flow in this project, different wall function processing methods are used to study the wind velocity field and the surface wind pressure of the structure, respectively. The effects of introducing different wall functions on numerical simulation are summarized. Fourthly, the variation of wind field around the circumference of super high-rise building and the wind pressure on the surface of the structure is compared with the increment of 45 掳. The wind velocity distribution characteristics and surface wind pressure distribution rules are obtained, which can be used as reference materials for the design of the project. Through the above analysis and research, some suggestions are put forward for the improvement of wind load code for super high-rise structures, the setting of parameters in numerical simulation research and the design of wind resistance of structures. The application of numerical simulation method in wind load research is summarized and prospected.
【学位授予单位】：武汉理工大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU973.213
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