# 鋼構期中報告 - PowerPoint PPT Presentation

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## 鋼構期中報告

9911020沈郡毓

• 公式

• Lp

• Mp=Fy×Zx

• Lr=

• Mr=FL×Sx

• W14x63

• A36

• 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

• Lp=94.611

• Lr=291.77

• Mp=2494.8

• Mr=1579.151

• 公式

• LC=min{，}

• Lu=

• Lt= rT

• Lc=101.27

• Lu=172.33

• Lt=256.20

### 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=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

### 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。