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鋼構期中報告

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鋼構期中報告. 9911020 沈 郡 毓 指導老師 : 徐暐亭. 1999LRFD( 英制 ). 公式 L p M p = F y × Z x L r = M r =F L × S x. 我的例題. W14x63 A36. 1999 LRFD 計算 結果. MP=2494.8 MR=1629.28 LP=94.61 LR=290.84. 1999 LRFD 強度 曲線圖. 1999 LRFD 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.

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slide1

鋼構期中報告

9911020沈郡毓

指導老師:徐暐亭

1999lrfd
1999LRFD(英制)
  • 公式
  • Lp
  • Mp=Fy×Zx
  • Lr=
  • Mr=FL×Sx
slide3
我的例題
  • W14x63
  • A36
1999 lrfd
1999LRFD 計算結果
  • MP=2494.8
  • MR=1629.28
  • LP=94.61
  • LR=290.84
1999 lrfd2
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
2010 AISC同例題計算結果
  • Lp=94.611
  • Lr=291.77
  • Mp=2494.8
  • Mr=1579.151
slide10
ASD
  • 公式
  • LC=min{,}
  • Lu=
  • Lt= rT
slide11
ASD同例題計算結果
  • Lc=101.27
  • Lu=172.33
  • Lt=256.20
slide14
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
slide15
1999計算結果
  • (a)Mn=Mp=2494.8
  • (b)Mn=1856.46
  • (c)Mn=864.59
  • 單位:k-in
slide16
2010計算結果
  • (a)Mn=Mp=2494.8
  • (b)Mn=1986.83
  • (c)Mn=941.179
  • 單位:k-in
slide17
Asd計算結果
  • (a)Mn=2022.7
  • (b)Mn=1085.42
  • (c)Mn=572.59
  • 單位:k-in
slide19
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。
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