WIND LOADS FOR CLADDING AFECTED BY OVERSHOOTING INTERNAL PRESSURE

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  • 内圧のオーバーシュートを考慮した外装材設計用風荷重
  • ナイアツ ノ オーバーシュート オ コウリョシタ ガイソウザイ セッケイヨウ カゼ カジュウ

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When cladding on a windward wall of a building is broken by a severe storm, the internal pressures may be rapidly increased. The sudden increase of the internal pressure is mentioned as “Aerodynamic Overshoot”, which may cause further damage to other cladding and interior components. This paper investigates the estimation of Overshoot-ratio using a non-dimensional parameter that characterizes the Overshoot phenomenon. This parameter is defined by using the wall opening area, the internal volume of the building, the incident wind speed and the pressure-loss coefficient of an opening. A result of field measurements suggests that the Overshoot-ratio has the values of 1.1 to 1.2 for usual size buildings. As a result, design wind loads for components and cladding on a building should be decided by using the peak internal pressure coefficient of 1.0 in order to prevent the expansion of damage caused by a wall breakages.

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