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鋼構 ( 二 ) 期中報告

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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鋼構 ( 二 ) 期中報告

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  1. 鋼構(二)期中報告 9911048 鄭孟樺 指導老師:徐暐亭

  2. 1999LRFD(英制) • 公式 • Lp • Mp=Fy×Zx • Lr= • Mr=FL×Sx

  3. 我的例題 • W16*57 • A36

  4. 1999LRFD 計算結果 • MP=3752.64k-in • MR=2399.03k-in • LP=94.05in • LR=273.16in

  5. 1999LRFD強度曲線圖

  6. 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

  7. 2010 AISC同例題計算結果 • Lp=79.92in • Lr=287.35in • Mp=3752.64k-in

  8. 2010 AISC強度曲線圖

  9. 2010.1999比較圖

  10. ASD • 公式 • LC=min{，} • Lu= • Lt= rT

  11. ASD同例題計算結果 • Lc=90.19in • Lu=172.14in • Lt=222.52in

  12. ASD之強度曲線圖

  13. 三者強度曲線比較

  14. 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

  15. 1999計算結果 • (a)Mn=Mp=3752.64 • (b)Mn=3136.19 • (c)Mn=1126.61 • 單位:k-in

  16. 2010計算結果 • (a)Mn=Mp=3752.64 • (b)Mn=3202.67 • (c)Mn=1218.89 • 單位:k-in

  17. 三者結果比較

  18. 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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