【作者】 李恒；

【导师】 楼文娟；

【作者基本信息】 浙江大学 ， 结构工程， 2007， 硕士

【摘要】 双层通风幕墙在改善高层建筑节能性和环保性方面起到了良好作用。双层幕墙外墙风压需要考虑内外表面的合力作用，其风荷载不同于传统单层幕墙。本文通过风洞试验研究了矩形和圆形截面高层建筑的外通风廊道式双幕墙的静、动力风压分布特性，对比分析了双幕墙内、外幕墙之间以及单、双幕墙之间风荷载取值的异同点，总结了双幕墙抗风薄弱部位，为此类幕墙抗风设计提供了设计依据。弧形大跨屋盖建筑因其外形美观、功能实用而在大型公用建筑工程中不断涌现。此类建筑自重轻、阻尼小，对风荷载比较敏感。研究其表面静、动力风荷载分布具有重要的实用价值。本文运用计算流体动力学(CFD)方法，选取不同湍流模型，对TTU试验建筑原型表面平均风压进行了模拟，将数值模拟结果与风洞试验和现场实测结果进行对比。在核实了数值模拟精度的基础上，运用改进的k-ε湍流模型对某曲面大跨网壳在大门开启和大门关闭两种不同工况下内、外表面的平均风压进行数值模拟研究，并考察了来流风向角和背景建筑对其风压分布的影响。最后，本文利用刚性模型风洞试验中测得的风压时程，对此曲面屋盖及雨蓬结构在时域内进行了风振响应分析，得到每个节点的加速度响应。在此基础上通过定义荷载风振系数，求得结构各节点的静力等效风荷载，并通过分块平均及整体平均求得屋盖及雨蓬表面分块和整体静力等效风荷载。本文还分析了静力等效风荷载的分布特点，为此类结构的抗风设计提供了依据。更多还原

【Abstract】 Double-skin facade system can greatly improve the energy saving and environmental performance of high rise buildings. For the wind resistant design of double skin facade, the net wind pressure on the external facade should be considered, which is more complicated than single-skin facade system. In this paper, wind tunnel tests on a cylindrical and a rectangular tall building with double-skin facade were carried out respectively and the characteristics of the wind loads on the double-skin facade were analyzed. The mean and fluctuating wind load distribution between the external and internal facade of double-skin facade system as well as between single facade and double facades were compared. Suggestions were made on the key part of wind resistance design of the double-skin facade system.Domes and semi-sphere shaped long-span roofs have been widely used in large public buildings because of its aesthetically great out looking and its high performance. This kind of structures are usually lightly weighted and have small damping thus are sensitive to wind loads. It is of great importance to study its mean and fluctuating wind loads.The mean wind pressures on the wall and roof of the TTU test building were simulated by the CFD method, using the full scale prototype model. Comparisons between the results from the wind tunnel tests, numerical simulations and the field tests were performed to verify the accuracy of the CFD method. Then the advanced k-ε turbulence model was used to compute the mean pressures on a long span curve shaped roof with the front door open or not open.At last, the wind pressure time serials derived from the rigid model wind tunnel experiment were adopted to calculate the wind induced vibrating response of this long span roof and awning system in time domain. The acceleration responses of each node of the roof and awning structures were thus available. Based on this, by defining the wind load factors, the equivalent static wind loads were calculated for each of the node. For the sake of practical use in structural wind resistant design, the roofstructure were divided into small areas, of witch the equivalent static wind loads were studied.更多还原