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# 鋼構期中報告 - PowerPoint PPT Presentation

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### 鋼構期中報告

9911020沈郡毓

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

• W14x63
• A36
1999LRFD 計算結果
• MP=2494.8
• MR=1629.28
• LP=94.61
• LR=290.84
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=94.611
• Lr=291.77
• Mp=2494.8
• Mr=1579.151
ASD
• 公式
• LC=min{，}
• Lu=
• Lt= rT
ASD同例題計算結果
• Lc=101.27
• Lu=172.33
• Lt=256.20

• 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=2494.8
• (b)Mn=1856.46
• (c)Mn=864.59
• 單位:k-in
2010計算結果
• (a)Mn=Mp=2494.8
• (b)Mn=1986.83
• (c)Mn=941.179
• 單位:k-in
Asd計算結果
• (a)Mn=2022.7
• (b)Mn=1085.42
• (c)Mn=572.59
• 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。