屋根瓦の耐風設計用風力係数

概要

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Scattering of roof tiles under strong wind is the most worrying problem in the wind engineering. A roof tile unbounded to the roof is significantly too light to prevent the scattering from the roof. In order to design a roof tile against strong wind, the appropriate wind coefficient of a roof tile should be decided. Wind force on roof tiles of an experimental house with a hipped roof was measured in natural wind. When wind attacks normal to the roof, peak wind forces of the roof tile were appeared. The value of maximum peak wind force coefficient was Cf =-5 on the edged roof and Cf =-3 on the general roof, respectively. The critical peak wind force coefficient of the roof tile was observed when the incline angle of the wind was vertical 10 degrees upward. The scattering wind velocity calculated using these coefficients is presumed approximately 10m/s, which is considered obviously too small compared with the design wind velocity of usual houses. Consequently, it is recommended that roof tiles are necessary to be fixed by somewhat binding method such as use a nail.
一般社団法人日本風工学会の論文