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An eccentrically compressed column is of rectangular section. The dimensions of the column are b ×...

An eccentrically compressed column is of rectangular section. The dimensions of the column are b × h = 500 mm × 800 mm, as = a0 s = 45 mm, and l0 = 4.6 m. The strength of the concrete is fc = 14.3 N/mm2. The properties of the reinforcement are f0 y = fy = 300 N/mm2 and Es =2× 105 N/mm2. If the axial force Nc = 7000 kN and the moment M = 175 kN·m are applied on the column and the section is asymmetrically reinforced, determine As and A0 s.

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Answer #1

ASymmenoi caly Reintorea a coion Given 2 14. 3 Nimm ьxhe Soo mm x Buomm = 300 n Imm2 4 5 Mm 2x103 Nmm 2 4b0o m m Es - 4.6 m keo 7 75 KN.m = o.O 25 m 000 kN eo 2 5mm ho as ho ww SSL = ho TS5 mm o 4600 ns must calulated 7 5 - 5.1S eo t ea e 300 26.67 C0.5X 14 3 x 500 x 800 To00 x 103 O 408 4600 Co.408) S2 1300 X SSL 800 4s 2 e 414.8 mm sectfon Com presston enrity Large (or)Assume Ecu = 0. 0033 O.8 300 2X105 0023 0.SS Pmin bh As = Take As =O.oo 2 X 50Ox 8po 2. As = 8bo mm -c ニーB」+ fy.As Cho-as hoToooxio (414 8 -155 + 45 ) (0.8- D. ss) -0.8x30sX gdo (T55- 45) 14. 3x Sao x 1ss2 (0.g - o.5s) C = - o S14 0.lo72 2( -v.514)ei 35-a - 2mm 800(-2) - 45 35 Mm Ne e- fc bh (ho- h) As 7 Cho-as) Too0x10x3s7 - - As 300(755-45) 2149 mm2 As= the memlbe Che

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