Abstract
Typhoon Faxai, the Reiwa 1 Boso Peninsula Typhoon, hit Kanto Region in 2019 caused damages more than 36 billion yen on greenhouses in Chiba prefecture. We surveyed multiple side-by-side pipe-framed greenhouses and multi-span steel frame greenhouses damaged by the Typhoon and Typhoon Phanfone to elucidate the effect of layout condition on behaviors of damaged greenhouses and on air flow pattern around greenhouses. The damage causes of greenhouses were positive pressure on windward side wall or side gable, negative pressure and re-attachment flow on roofs of leeward greenhouses, and contraction flow. For the measures against strong wind, it is important that appropriate direction of shelter net, addition of bracing on pipe-framed greenhouse, and maintenance of depth of foundations of steel greenhouse.
