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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

• 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

• 公式

• LC=min{，}

• Lu=

• Lt= rT

• Lc=90.19in

• Lu=172.14in

• Lt=222.52in

進階例題說明

• 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

最終分析

• 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。