Question

19. A reinforced concrete column is 300 mm x 300 mm in
section. The column is provided with 8 steel bars of 20 mm
diameter. The column carries a load of 360 KN. Find stresses in
concrete and the steel bars take Es = 2.1 x 10 N/mm.
Econ = 0.14 x 10' N/mm.​

Answer 1

Answer:

Econ= 0.14 × 10 ' N / mm

Step-by-step explanation:

this is anwer

Answer 2

Answer:

σc = 2.819 N/mm

Step-by-step explanation:

Area of column = 300mn x 300 = 90000 mm2

are of steel bar =8x(π/4)x20²

                          =2513.27 mm²

Strain in concrete = Strain in bars

σ c/ E c  = σ s/ ∑ s .........(1)

total load

ρ = σsAs + σcAc

360 x 103N = σsAs + σcAc  .....(ii)

σc =  (∑c/∑c) ∑s

σc =  σ s/15 ....(iii)

Putting the value  σ0 in equation (ii)

360 x 103 = σs (2513.27 + 6000)

σc = 2.819 N/mm2

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