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Wind Directionality Factors for Nonhurricane and Hurricane-Prone Regions
| 题名： | Wind Directionality Factors for Nonhurricane and Hurricane-Prone Regions |
| 其他题名： | ASCE.(2010)."Minimum design loads for buildings and other structures."ASCE 7-10,Reston,VA. |
| 正文语种： | 英文 |
| 作者： | Filmon Habte |
| 关键词： | Aerodynamics;Directionality;Standards and codes;Structural engineering;Structural reliability;Wind engineering;Wind speeds;Wind effects |
| 摘要： | The wind directionality factor, Kd, is a nondimensional quantity smaller than unity that reflects the fact that the climatologically and aerodynamically or dynamically most unfavorable wind directions typically do not coincide. The ASCE 7-10 standard specifies for buildings a directionality factor Kd ¼ 0.85, although no justification appears to have been adduced for this value in the literature. This paper presents a more informed discussion of this topic by the engineering and codification communities. The results of this work show that the directional factor Kd varies as a function of type of wind storm, geographical location within an area with a given type of wind climate, type of wind effect (e.g., local pressures, internal forces in members of wind force resisting systems, global shear or torsion), and position of the wind effect being considered in the structure. These results suggest that, in most if not all cases, the dependence of the directionality factor on mean recurrence interval of wind effects is weak, and they confirm a recent finding that Kd values are larger for hurricane-prone than for nonhurricane regions. For pressures at individual points on building envelopes, the value Kd ¼ 0.85 is typically found to be adequate for hurricane-prone regions and conservative for nonhurricane regions. For internal forces in wind force resisting systems (e.g., frames), the value Kd ¼ 0.85 is typically adequate for nonhurricane regions while Kd ¼ 0.90 is required for hurricane-prone regions, in spite of its conservatism in some situations. Finally, for global effects, such as building base shears and global building torsion, the values Kd ¼ 0.90 and Kd ¼ 0.95 are appropriate for nonhurricane and hurricane-prone regions, respectively. |
| 出版年： | 2015 |
| 论文唯一标识： | P-26Y2015V141N08024 |
| 英文栏目名称： | Technical Papers |
| doi： | 10.1061/(ASCE)ST.1943-541X.0001180 |
| 期刊名称： | Journal of Structural Engineering |
| 拼音刊名(出版物代码)： | P-26 |
| 卷： | 141 |
| 期： | 08 |
| 页码： | 254-262 |
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