Question

13. Design a rectangular beam for an effective span of 6m. The superimposed load is 80kN/m and
size of the beam is limited to 30cm x 70cm overall. Use M20 and Fe415 grade steel.​

Answer 1

Answer:

a) Lean mixes bleed more as compared to rich ones.

b) Bleeding can be minimized by adding pozzuolana finer aggregate.

c) Bleeding can be increased by addition ‘of calcium chloride.

d) none of the above

Answer 2

Answer: $109$

Explanation:

Step 1: Size of the beam. b = $30cm & D = 70cm d = 70-25-20/2 =35cm$

Step 2: Moment Calculation. M = $80kNm$

Step 3: Check for effective depth.

$M_{bal}$ = $Qbd_{2}$ = $2.97*30*35^{2} = 109kNm > M$

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