螺絲抗拉強度計算 - 土木
By Frederic
at 2011-03-30T18:16
at 2011-03-30T18:16
Table of Contents
昨天原本有po出,後來以為找到解答就自刪,但還是有疑惑只好請先進們指教
最近剛好一個鋼構風雨棚案子,業主想在兩側加彩色玻璃雨遮
玻璃嵌在圓鋼管間,固定鐵件以螺絲固定
因為廠商搖頭說不會算抗風壓的螺絲需求,變成轉嫁設計單位 XD
螺絲抗拉強度計算,公式皆是材質抗拉強度乘上螺絲斷面積
至於斷面積公式網路找到兩條:
公制:0.7854[D-(0.9382*P)]^2 mm^2 D:規格 P:牙距
英制:0.7854[D-(0.9743/n)]^2 in^2 n:牙數
小弟想問的是:公式使用前提是全部螺牙皆鎖進?
不然以本案卡住螺牙的肉只有鋼管厚度,
設計方式是否以鎖到肉的比例當安全係數cover才合理?
另外一問:開螺絲材質強度規格,一般會照JIS 5.8,6.8,8.8.....?還是另有他法
哈 從沒開過螺絲規格XD, 問兩家螺絲廠,一個不知道,一個看沒賺頭敷衍了事XD
--
最近剛好一個鋼構風雨棚案子,業主想在兩側加彩色玻璃雨遮
玻璃嵌在圓鋼管間,固定鐵件以螺絲固定
因為廠商搖頭說不會算抗風壓的螺絲需求,變成轉嫁設計單位 XD
螺絲抗拉強度計算,公式皆是材質抗拉強度乘上螺絲斷面積
至於斷面積公式網路找到兩條:
公制:0.7854[D-(0.9382*P)]^2 mm^2 D:規格 P:牙距
英制:0.7854[D-(0.9743/n)]^2 in^2 n:牙數
小弟想問的是:公式使用前提是全部螺牙皆鎖進?
不然以本案卡住螺牙的肉只有鋼管厚度,
設計方式是否以鎖到肉的比例當安全係數cover才合理?
另外一問:開螺絲材質強度規格,一般會照JIS 5.8,6.8,8.8.....?還是另有他法
哈 從沒開過螺絲規格XD, 問兩家螺絲廠,一個不知道,一個看沒賺頭敷衍了事XD
--
Tags:
土木
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