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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 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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4329595

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


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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 lrfd1

1999LRFD強度曲線圖


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


2010 aisc1

2010 AISC強度曲線圖


2010 1999

2010.1999比較圖


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ASD

  • 公式

  • LC=min{,}

  • Lu=

  • Lt= rT


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ASD同例題計算結果

  • Lc=90.19in

  • Lu=172.14in

  • Lt=222.52in


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ASD之強度曲線圖


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三者強度曲線比較


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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


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1999計算結果

  • (a)Mn=Mp=3752.64

  • (b)Mn=3136.19

  • (c)Mn=1126.61

  • 單位:k-in


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2010計算結果

  • (a)Mn=Mp=3752.64

  • (b)Mn=3202.67

  • (c)Mn=1218.89

  • 單位:k-in


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三者結果比較


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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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