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# 鋼構 ( 二 ) 期中報告 - PowerPoint PPT Presentation

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### 鋼構(二)期中報告

9911048 鄭孟樺

1999LRFD(英制)
• 公式
• Lp
• Mp=Fy×Zx
• Lr=
• Mr=FL×Sx

• W16*57
• A36
1999LRFD 計算結果
• MP=3752.64k-in
• MR=2399.03k-in
• LP=94.05in
• LR=273.16in
1999LRFD曲線說明
• Lb<=LP屬於塑性
• Lp< Lb <= Lr 屬於非彈性
• Lb>Lr屬於彈性
2010 AISC同例題計算結果
• Lp=79.92in
• Lr=287.35in
• Mp=3752.64k-in
ASD
• 公式
• LC=min{，}
• Lu=
• Lt= rT
ASD同例題計算結果
• Lc=90.19in
• Lu=172.14in
• Lt=222.52in

• 當K=1.2.樑長度40ft(假設斷面都符合寬厚比限制)
• (a)樑斷面全部有側向支撐時之標稱彎矩
• (b)當L為2倍LP之標稱彎矩(asd為L=2LC)
• (c)樑中間無側向支撐之標稱彎矩
1999計算結果
• (a)Mn=Mp=3752.64
• (b)Mn=3136.19
• (c)Mn=1126.61
• 單位:k-in
2010計算結果
• (a)Mn=Mp=3752.64
• (b)Mn=3202.67
• (c)Mn=1218.89
• 單位:k-in

• Asd的公式是屬於比較複雜的公式，lrfd採取較簡潔的設計公式，asd則是把lrfd裡面的x1 x2省略。