Structural Design & Drawing (RCC-I) (CE-601) - Important Questions

Explain under-reinforced, over-reinforced and balanced sections as per limit state method of RCC design with neat sketches.

Draw cross-section of singly reinforced rectangular beam showing strain and stress distribution diagrams as per limit state method.

Explain the critical sections for design shear as per IS 456 with requisite sketches.

Determine the ultimate moment of resistance of a singly reinforced T-beam section with 120 mm thick slab, 300 mm wide and 580 mm effective depth rib reinforced with 8 bars of 20 mm diameter. Use M20 concrete and Fe415 steel.

Calculate the ultimate moment of resistance of a doubly reinforced rectangular beam section 250 mm wide and 550 mm effective with compression and tension steel for factored moment of 300 kNm. Use M20 concrete and Fe415 steel, assume d' = 50 mm.

Explain the various bond failure mechanisms in reinforced concrete.

Design a one-way simply supported slab for a hall of 3 m x 7 m clear dimension to act as roof for live load of 2 kN/sq.m and floor finishes of 1.5 kN/sq.m resting on 230 mm brick walls. Adopt M20 concrete and Fe415 steel and give detailing sketch.

Design an isolated rectangular footing for a rectangular column of section 300 mm x 500 mm supporting a factored axial load of 1500 kN. SBC of soil is 185 kN/sq.m. Adopt M20 concrete and Fe415 steel with checks for one-way and two-way shear.

Design a circular column of diameter 300 mm to carry a factored axial load of 1500 kN using (a) helical reinforcement and (b) lateral-tie reinforcement. Use M20 concrete and Fe415 steel.

Design longitudinal reinforcement with detailing sketch for a 450 mm x 450 mm column of unsupported length 4.2 m subjected to factored axial load of 1600 kN with biaxial moments of 150 kNm and 100 kNm. Use M25 concrete and Fe500 steel.

List the steps involved in designing strap footings.

Design a dog-legged staircase supported on 300 mm thick walls at the landing ends with riser 150 mm, tread 300 mm, live load 5 kN/sq.m and floor finish 1 kN/sq.m. Use M20 concrete and Fe415 steel with reinforcement detailing sketch.