超高层建筑外表面复杂装饰条的风荷载特性研究

发布时间：2018-05-29 14:50

本文选题：超高层 + 复杂装饰条　；参考：《工程力学》2016年08期

【摘要】：为展现建筑外形的多变性,超高层建筑外表面布置的装饰条尺寸越来越大,布置形式越来越灵活多变,其抗风安全性变得越来越突出。但装饰结构由于其体量小数量多而导致风洞试验难于直接测试其风荷载,因此该文研究利用数值风洞技术分析装饰结构的风荷载问题。以上海前滩一超高层为工程背景,该建筑外围四个面共布置72根装饰条,其中外围装饰条220 m高度以下均匀布置,220 m高度以上空间曲线交错布置。通过建立包括装饰条以及周边建筑的空间几何模型,求解不同风向角下的流场分布,从而获取了装饰条上的作用风荷载。通过统计分析不同风向角下不同高度区域装饰条的法向和切向风荷载系数分布特点,得出装饰条所受风荷载表现为明显的建筑拐角区域大而建筑平顺区域小的分布规律,并分析了其原因。给出装饰条的风荷载计算可以按照建筑外形划分为拐角区域、平顺区域以及过渡区域分别加以考虑,以及各个区域风荷载系数的控制取值,该结果可供类似工程项目设计提供参考。最后选取整体建筑表面的一些典型位置,对比了该些位置处风压的风洞试验结果与数值模拟结果,验证了数值模拟的可靠性。
[Abstract]:In order to show the variability of building shape, the outer surface decoration strip size of super high-rise building is larger and larger, the layout form is more and more flexible and changeable, and its wind safety becomes more and more prominent. However, the wind tunnel test is difficult to directly test the wind load of decorative structure because of its small volume and large quantity. Therefore, the numerical wind tunnel technique is used to analyze the wind load problem of decorative structure in this paper. In the background of Shanghai Qiantan super-high building, 72 decorative strips are arranged on the four sides of the building, in which the outer decoration strip is evenly arranged below 220m height and the space curve is staggered above 220m height. The flow field distribution under different wind direction angles is solved by establishing the spatial geometric model including the decorative strip and the surrounding building, and the action wind load on the decorative strip is obtained. Based on the statistical analysis of the distribution characteristics of normal and tangential wind load coefficients in different height and different wind angles, it is concluded that the distribution of wind load on decorative strips is obviously large in the corner of the building and small in the smooth zone of the building. The reasons are analyzed. The wind load calculation of the decorative strip can be divided into corner region, smooth zone and transition area according to the shape of the building, as well as the control value of wind load coefficient in each region. The results can be used as a reference for the design of similar engineering projects. Finally, some typical locations of the whole building surface are selected, and the results of wind tunnel test and numerical simulation at these locations are compared to verify the reliability of the numerical simulation.
【作者单位】：上海应用技术学院城市建设与安全工程学院;同济大学土木工程防灾国家重点实验室;
【基金】：上海市科委基金项目(13ZR1441100)
【分类号】：TU973.213

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