JNTUK B.Tech R23 3-1 Design and Drawing of Reinforced Concrete Structures subject Civil Branch imp questions

UNIT - I: Introduction & Limit State Design

2 Marks Questions:

1. What is the fundamental assumption in flexural theory? Is it valid at the ultimate state?
2. Define characteristic loads and characteristic strength in limit state design.
3. What is modular ratio and how is it calculated in working stress method?

5 Marks Questions:

1. Justify the Code specification for the limiting neutral axis depth in Limit State Method.
2. What is the fundamental assumption in flexural theory? Is it valid at the ultimate state?
3. Discuss the torque-twist relationship for (i) plain concrete, and (ii) reinforced concrete members subjected to pure torsion.
4. What are the advantages and disadvantages of providing large clear cover to reinforcement in beams?
5. Explain the concepts of balanced, under-reinforced and over-reinforced sections in working stress method.
6. Derive the stress-block parameters and limiting moment of resistance in limit state design.

UNIT - II: Design for Flexure

2 Marks Questions:

1. Define effective depth and its significance in beam design.
2. What is the limiting percentage of steel in singly reinforced beams?
3. Explain the concept of moment of resistance in flexural design.

5 Marks Questions:

1. Design a reinforced concrete footing for a column of section 350 × 350 mm which is subjected to an axial load of 1000kN and uniaxial moment of 250kN.m at service state.
2. Design a continuous R.C. slab for a class room 6m wide and 12m long. The roof is to be supported on R.C.C. beams spaced at 3.0m intervals.
3. A rectangular beam is 200mm wide and 500mm deep. It is reinforced with 6 bars of 20mm diameter in compression with an effective cover of 50mm. Determine the area of tension reinforcement needed to make the beam section fully effective.
4. Analyze and design a T-beam section for given loading conditions.
5. Design a doubly reinforced rectangular beam section for given moment and material properties.
6. Calculate effective flange width for T-beam and design the section for flexure.

UNIT - III: Design for Shear, Torsion and Bond

2 Marks Questions:

1. Define development length and its significance in reinforcement detailing.
2. What are the IS code provisions for minimum shear reinforcement?
3. Explain the concept of bond stress in reinforced concrete.

5 Marks Questions:

1. Discuss the torque-twist relationship for (i) plain concrete, and (ii) reinforced concrete members subjected to pure torsion.
2. The provision of minimum stirrup reinforcement is mandatory in all reinforced concrete beams. Why?
3. Describe briefly the load transfer mechanism in a two-column combined footing.
4. Design shear reinforcement for a rectangular beam subjected to factored loads.
5. Explain the concept of bond stress and anchorage length requirements as per IS code.
6. Design shear reinforcement for an L-beam subjected to shear and torsion.

UNIT - IV: Design of Compression Members & Footings

2 Marks Questions:

1. Define effective length of column and factors affecting it.
2. Differentiate between braced and unbraced columns.
3. What are the different types of footings used in construction?

5 Marks Questions:

1. Design a reinforced concrete footing for a column of section 350 × 350 mm which is subjected to an axial load of 1000kN and uniaxial moment of 250kN.m at service state.
2. Design an axially loaded braced rectangular column for the following data: Ultimate axial load Pu = 4000 kN, Unsupported length l = 3.25 m, Effective lengths lex = 3.0 m and ley = 2.5 m.
3. Describe briefly the load transfer mechanism in a two-column combined footing.
4. Design a short column subjected to axial load and biaxial bending.
5. Design a short column subjected to axial load and uniaxial bending moment.
6. Design an isolated square footing for given column loads and soil bearing capacity.

UNIT - V: Slabs

2 Marks Questions:

1. Classify different types of slabs based on support conditions.
2. What are the IS coefficients used in continuous slab design?
3. Define one-way and two-way slab action.

5 Marks Questions:

1. Design a continuous R.C. slab for a class room 6m wide and 12m long. The roof is to be supported on R.C.C. beams spaced at 3.0m intervals.
2. Design a one-way slab using limit state method for given loading conditions.
3. Design a two-way slab using IS coefficient method.
4. Design a waist-slab staircase with reinforcement detailing.
5. Analyze and design a continuous slab system using IS coefficients.
6. Compare one-way and two-way slab behavior and design procedures.