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鋼構 ( 二 ) 期中報告

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鋼構 ( 二 ) 期中報告. 9911048 鄭孟樺 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. W16*57 A36. 1999 LRFD 計算結果. MP=3752.64k-in MR=2399.03k-in LP=94.05in LR=273.16in. 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.

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slide1

鋼構(二)期中報告

9911048 鄭孟樺

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
  • W16*57
  • A36
1999 lrfd
1999LRFD 計算結果
  • MP=3752.64k-in
  • MR=2399.03k-in
  • LP=94.05in
  • LR=273.16in
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=79.92in
  • Lr=287.35in
  • Mp=3752.64k-in
slide10
ASD
  • 公式
  • LC=min{,}
  • Lu=
  • Lt= rT
slide11
ASD同例題計算結果
  • Lc=90.19in
  • Lu=172.14in
  • Lt=222.52in
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=3752.64
  • (b)Mn=3136.19
  • (c)Mn=1126.61
  • 單位:k-in
slide16
2010計算結果
  • (a)Mn=Mp=3752.64
  • (b)Mn=3202.67
  • (c)Mn=1218.89
  • 單位:k-in
slide18
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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