Characteristics of local wind forces on the edges of signboards installed on the rooftops of buildings. Issue 206 (November 2020)

• Record Type: Journal Article
• Authors: Masuyama, Yuka; Uematsu, Yasushi; Nakamura, Osamu; Okuda, Yasuo
• Is Part Of: Journal of wind engineering and industrial aerodynamics. Issue 206(2020)
• Publication Date: 2020-11
• Subjects: Rooftop signboard -- Maximum peak wind force coefficient -- Wind tunnel experiment -- Flow visualization; Wind-pressure -- Periodicals; Buildings -- Aerodynamics -- Periodicals; Pression du vent -- Périodiques; Constructions -- Aérodynamique -- Périodiques; Buildings -- Aerodynamics; Wind-pressure; Periodicals
• DOI: 10.1016/j.jweia.2020.104299
• Languages: English
• ISSNs: 0167-6105

Abstract

Abstract: Many signboards are installed on the rooftops of low- and middle-rise buildings in Japan, which are often damaged by strong winds. However, there are no specifications of wind force coefficients for such signboards in the Japanese building codes and standards. In the present study, wind tunnel experiments were conducted to collect data on wind force coefficients under various conditions, including building shapes, as well as signboard shapes and locations. The distributions of the maximum peak wind force coefficients were obtained at various wind angles. Based on the results, the variation of the maximum peak wind force coefficient with wind angle was investigated. It was found that very large wind forces occurred near the edges of the signboard at oblique wind angles ranging from 30° to 60° with respect to the outside surface of the signboard. The present study focuses on such conditions that cause large wind forces on signboards. The results indicate that the building shape significantly affects the maximum peak wind force coefficient. Highlights: Local maximum peak wind forces on the rooftops signboards are investigated. (75 characters). Signboards are installed on the rooftops of low- and middle-rise buildings or ground. (85 characters). Wind tunnel experiments changed the signboard shape, size, and location. (72 characters). Flow visualization showed conical vortex in the leeward of the signboard. (73 characters).