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walls. The length of the duct is 4ft and is heated from room square duct made of ductile material is fixed between two A tempA square duct made of a ductile material...

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AT >o Per tin pcr K 4ft 1.2 in 14 uft 48 inches 2 hence length of duet 48 inches 2. load * E I min Para Crippling 2 (le) I miAt buckling Force applied a per Areaz Area of cross section of the duet Force 2 z) De e Area) XE E 2 Fone Area Dd e ex Fone ANow duet (oobs section tin 1-2m And he or is effective length for fined support le all { length of duet 2 2 DTZ I min 2 4 ÀATC 2 x (5²+d) xx3 l ? 2 b Fined replaced by pin point o) le = (l) [length of dust we know 2 ЛТ Ăx I min Jound earlier 2 (le)30ksi a We know CE yield strength = AT at buckling Catyeild) 58.067 To find DT Weknow Dla ex Force z ea DT (pooored earlier AД1 30 68.9655°F 2 29x18x15x106 reach crippling So when we heat it will early for crippling & IT ind , hence it buckled before

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