# Civil Engineering - Theory of Structures - Discussion

Discussion Forum : Theory of Structures - Section 3 (Q.No. 1)
1.
If a concrete column 200 x 200 mm in cross-section is reinforced with four steel bars of 1200 mm2 total cross-sectional area. Calculate the safe load for the column if permissible stress in concrete is 5 N/mm2 and Es is 15 Ec
264 MN
274 MN
284 MN
294 MN
None of these.
Explanation:
No answer description is available. Let's discuss.
Discussion:
16 comments Page 2 of 2.

Shiva said:   7 years ago
Explain this with formula.

Nishant Jain said:   8 years ago
Ans is C.

Find permissible stress[\$] in steel first as:

Permissible stress in steel/permissible stress in concrete = Es/Ec.
Permissible stress in steel = 5 * 15Ec/Ec = 75.

Now solve:
P = 5 * (200 * 200 - 1200) + (1200 * 75) = 284000N = 284.

Abhishek.kumar said:   8 years ago
Sir. Plese tell me the correct answer with explanation.

MRINAL KANTI BISWAS said:   8 years ago
P = 5*(200*200-1200) + (1200*15) = 212000 N