名詞解釋:負風壓

名詞解釋:負風壓

負風壓之形成圖


而負風壓的大小與分佈,根據日本大學生產工學部耐風工學研究室丸田巢藏氏之實驗結果發現,當風向角在下圖以45º角方向吹入時,其負風壓係數分佈狀況如圖所示。

負風壓係數之分佈狀況


因此,負風壓之大小,就隨著風速之大小而有所不同,其間之關係如下述之公式所示:
P = C × q      q = V2  / 16
P:承受風壓(㎏/㎡)
C:負風壓係數
q:風壓速(㎏/㎡)
V:風速(m/sec)
上述公式中負風壓係數的大小,根據上述實驗報告之結果得知約在-1~-2之間。但另有根據其他之實驗,則有超過-3,甚至接近-6之報告者。故若欲求屋面防水層所承受負風壓之大小,則應以負風壓係數為-6之最大基數計算之。
因此,若以瞬間風速為60m/s之17級風計算之,則屋面防水層所承受之負風壓為

P = C × q      q = V2  / 16(㎏/㎡)
P = -6 × (60)2 / 16
P =-1,350㎏/㎡
=-0.135㎏/cm2

在我國,為了應用上的方便,對於風壓之大小,可參考建築技術規則建築構造篇第三十三條之最小風壓力之風力區分區數值,再以該風壓力之數值乘以上述最大之負風壓係數(-6),即是防水層所可能承受之最大負風壓力之大小。
 

回應

Re: 名詞解釋:負風壓

恩,

樓上的文章真的是專業度100 !

補充一下

負風壓是我們在屋頂設計薄層綠化重要的考量因子

也就是能否設置薄層綠化的因素

關於這點,相信防水格主後續會介紹到!

我的疑问,

我的疑问, 给楼上的那位大虾解开了。。 负风压是如何形成的

Re: 名詞解釋:負風壓

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