【作者】 胡卫法；

【导师】 楼文娟；

【作者基本信息】 浙江大学 ， 结构工程， 2008， 硕士

【摘要】 以节能、生态为理念的双层幕墙(DSF)围护体系已逐步应用于高层办公建筑。由于双层幕墙之间存在通风廊道,因此对于双层幕墙建筑有三个受风表面,即外层幕墙的内外表面以及内层幕墙的外表面,这使得风荷载取值变得复杂,而各国规范中关于双层幕墙风荷载取值方面的内容几乎没有涉及。本文主要就双层幕墙风荷载问题展开了以下研究:双层幕墙风压分布特性研究。结合双层幕墙典型模型的风洞试验,分别对一字型和L型双层幕墙的内外幕墙平均风压和脉动风压进行了详细分析,探讨了双层幕墙风压分布的特征和规律。双层幕墙围护结构设计风荷载研究。研究国外规范和我国荷载规范,对国内外规范关于围护结构风荷载取值的规定进行比较。结合某实际工程双层幕墙建筑风洞试验,对双层幕墙围护结构峰值因子、阵风系数和体型系数取值规律及外层幕墙风压取值等相关问题进行了探讨,并对抗风设计提出了一些建议。双层幕墙平均风荷载的数值模拟研究。运用计算流体动力学(CFD)方法,对双层幕墙矩形建筑风荷载进行了数值模拟,将数值模拟结果与风洞试验结果进行对比,在核实了数值模拟精度的基础上,运用改进的k-ε模型对双层幕墙平均风荷载的风洞缩尺效应进行了数值探讨,并研究了参数变化对L型双层幕墙平均风荷载的影响。更多还原

【Abstract】 The double-skin facades (DSF) are applied to multistory office buildings gradually as people require energy-saving and ecotype. For the buildings with DSF, there are three surfaces subjected to wind pressure due to the airflow between the DSF. Those are the outside and inside surfaces of the external skin facade and the outside surface of the internal skin facade. Consequently, the wind loads acting on the DSF become complicated, but in most countries few Codes are presented to regulate the wind loads on DSF. The research is mainly focused on the wind loads acting on DSF in following aspects:Study on characteristics of wind loads distribution on DSF. Base on the wind tunnel model test of a DSF building, the characteristics of mean wind pressure and fluctuating wind pressure on the internal and external skin facade of straight facade and L-section facade are studied in details and some common laws about wind pressure distribution are discussed.Study on wind loads on cladding structures of DSF. The specific regulations for the cladding structural wind loads are compared between the Chinese Load Code and foreign Load Code. Based on the test results, related questions about designed wind loads on DSF are discussed, such as the rules of selecting peak factor、gust coefficient and figure coefficient, wind loads on external skin of DSF are also discussed. Some suggestions of wind-resistance design are proposed.Study on mean wind loads of DSF by numerical simulation. Wind loads on DSF buildings with rectangular shape are computed by CFD method, comparisons between the results from the wind tunnel test and the numerical simulation are then performed to know the accuracy of the simulation. The advanced k-εturbulence model is used to discuss the scale effect on mean wind loads of the wind tunnel models and full scale DSR The mean wind loads on L-section facades have been analyzed under different parameters.更多还原