PRIST UNIVERSITY (Estd. u/s 3 of UGC Act, 1956)

Vallam, Thanjavur -613403________________________________________________________________________

M.Tech. – STRUCTURAL ENGINEERING

QUESTION BANK

Course Details

Course Code & Title : 12255H23/ Advanced Concrete Structural Design

Regulations : 2012 Regulation

Semester : II

H.O.D Staff-In-Charge

12255H23/ADVANCED CONCRETE STRUCTURAL DESIGN

AIM and OBJECTIVES:Performance of concrete and steel as structural materials and the behavior, elastic and inelastic, of reinforced – concrete members and structures, designing structures safely, economically and efficiently.

UNIT I INTRODUCTION 8The nature of concrete- Behaviour of concrete - stress-strain relationships of concrete, - stress-strain relationships of reinforcing steel- Failure criteria for concrete (crack width calculation is must).

UNIT II REVIEW OF OVERALL DESIGN 8Limit state analysis and design of beams in flexure - Behavior of reinforced concrete members in bending - Plastic hinge – Rotation capacity – Factors affecting rotation capacity of a section – Plastic moment – Moment curvature relationship – Redistribution of moments.

UNIT III STRUCTURAL DESIGN 8Limit state design of deep beams. Design of Flat Slabs using BIS 456. Design of slender columns subjected to combined bending moment and axial force using SP 16 .

UNIT IV SHEAR WALL 8Analysis and design of shear wall framed buildings.

UNIT V DUCTILITY 8Detailing for ductility - fire resistance of buildings - field control of concrete

REFERENCE 1.Krishnaraju, (1998), Advanced Concrete Design, CBS Publishers and

distributors, Delhi. 2. Varghese P.C, Design of Reinforced Concrete Structures, Prentice hall of India. 3.Krishnamurthy, K.T, Gharpure S.C. and A.B. Kulkarni – Limit design of reinforced

concrete structures, Khanna Publishers, 1985.4. Unnikrishna Pillai -TMH Books5. Jain and Jaikrishna, (2002), Plain and reinforced concrete, Vol. II, Nemi ChandBros., Roorkee.6. Durham, (2003), Advanced Concrete Design, Oxford Publishing privateLimited.

H.O.D. Staff-In-Charge

UNIT - I

PART-A1. What is mean by crack width?2. Define the characteristic and design strength.3. What are the factors influencing the stress- strain relationship of concrete?4. Define the characteristic and design loads.5. What are the allowable crack widths in buildings?6. Draw the stress-strain relationships of concrete.7. List the various failure modes in RC structures.8. What are the causes for the failure of a structure?9. What are the methods used to avoid spalling of concrete with high temperatures?10. What are the properties of fresh concrete?

PART-B

1. Explain the procedure described in IS 456-2000 to estimate the crack width of RC members.

2. A rectangular beam 300 mm x 500 mm having an effective span of 6 m, is subjected to UDL of 16 kN/m inclusive of its own weight. The beam is reinforced with 3 bars of 20 mm diameter, at an effective cover of 50mm; Assume M20 concrete and Fe415 steel. Calculate the surface crack width at the following locations

a) at a point on the side of the beam 250mm below the N-A b) at a point on tension face, midway between two bars.

c) at the bottom of corner3. Write short note on a) Partial safety factor for material strengths

b) Partial safety factors for loads4. A rectangular beam 230 mm x 350 mm having an effective span of 4 m, is

subjected to UDL of 20kN/m inclusive of its own weight. The beam is reinforced with 3 bars of 16 mm diameter, at an effective cover of 40mm; Assume M20 concrete and Fe415 steel. Calculate the surface crack width at the following locations

a) at a point on the side of the beam 250mm below the N-A b) at a point on tension face, midway between two bars.

c) at the bottom of corner

5. A simply supported rectangular beam spanning over 6 m, has a width of 300 mm and overall depth of 600 mm. the beam is subjected to a working moment of 160kNm at the centre of the section. The beam is reinforced with 4 bars of 25 mm diameter on the tension side at an effective depth of 550 mm spaced at 50 mm centers. Assume M25 grade concrete and Fe415 HYSD bars, Check the beam for the serviceability limit state of cracking according to IS: 456-2000 code method.

6. A simply supported rectangular beam spanning over 8 m, has a width of 300 mm and overall depth of 650 mm. the beam is subjected to a working moment of 150kNm at the centre of the section. The beam is reinforced with 4 bars of 25 mm diameter on the tension side at an effective depth of 600 mm spaced at 50 mm centers. Two nominal hanger bars of 12 mm diameter are provided on the compression side. Assume M20 grade concrete and Fe415 HYSD bars, Check the beam for the serviceability limit state of cracking according to IS: 456-2000 code method.

H.O.D. Staff-In-Charge

UNIT-II

PART-A

1. What do you mean by limit state of collapse?

2. Define limit state of serviceability.

3. Describe the following

a) Limit state

b) Aim of limit state design

4. Define Plastic hinge.

5. List the factors affecting rotation capacity of a section.

6. Write a short note on redistribution of moments.

7. What is the significance of the condition on depth of neutral axis while adopting

moment redistribution?

8. Define rotation capacity of a section.

9. Draw the moment curvature relation curve at a beam section

10. What are the factors affecting available rotation at the plastic hinge?

PART-B

1. Design a singly reinforced concrete beam to suit the following data:Clear span = 4mWidth of supports = 300 mmService load = 5 kN/mMaterial: M20 grade concreteFe-415 HYSD Bars

2. A reinforced concrete beam is to be designed over an effective span of 5 m to support a design service load of 8 kN/m. Adopt M-20 grade concrete and Fe-415 HYSD bars and design the beam to satisfy the collapse and serviceability limit states.

3. Design a reinforced concrete beam of rectangular section using the following data: Effective span = 5 m Width of beam = 250 mm Overall depth = 500 mm Service load (DL+LL) = 40 kN/m Effective cover = 50 mm Materials: M20 grade concrete Fe-415 HYSD bars

4. A tee beam slab floor of an office comprises of a slab 150 mm thick spanning between ribs spaced at 3 m centers. The effective span of the beam is 8 m. Live load on floor is 4 kN/m2 . Using M20 grade concrete and Fe-415 HYSD bars, design one of the intermediate tee beams.

5. Design a L- beam for an office floor to suit the following data. Clear span = 8 m

Thickness of flange = Df =150 mm Live load = 4 kN/m2 Spacing of beams = 3 mfck =20 N/mm2 and fy = 415 N/mm2

L- Beams are monolithic with R.C columnsWidth of column = 300 mm

6. Write short notes on a) Redistribution of moments.b) Plastic hinge and rotation capacity.

H.O.D. Staff-In-Charge

UNIT-III

PART-A

1. Under what circumstances the RCC deep beams are used?

2. What is a slender column?

3. List out the various methods available for the analysis of flat slabs.

4. What are the four end conditions of column?

5. What do you mean by deep beams?

6. State four assumptions made for the limit state of collapse in compression.

7. What do you mean by Flat slabs?

8. What is the codal requirement of minimum eccentricity for a column member?

9. Distinguish between short and long column

10. State the reinforcement details for continuous deep beams as per IS:456

PART-B

1. Design a short column for the following data.

Size of column - 300 mm x 600 mm

Concrete grade -M20

Steel grade -Fe415

Factored load Pu -2000 kN

2. Design an axially loaded tied column 400 x 400 mm pinned at both ends with an

unsupported length of 3m for carrying a factored load of 2300 kN. Use M20 grade

concrete and Fe 415 steel.

3. Design a circular pin-ended column 400 mm dia and helically reinforced, with an

unsupported length of 4.5 m to carry a factored load of 900 kN. Assume M30

concrete and Fe 415 steel.

4. Design an interior panel of a flat slab 4.8 m x 5.8 m in size. The slab is supported

on circular columns of diameter 500 mm. The height of the columns above and

below the slab is 3.8 m. Live load on the floor is 4 kN/m. Weight due to finishes

may be assumed as 0.48 kN/m2. Use the direct design method.

5. Design the reinforcement in a rectangular column of size 300 mm by 500mm to

support a design ultimate load of 500 kN. together with a factored moment of 200

kN-m. Assume M20 concrete and Fe 415 steel.

6. A reinforced concrete deep beam is to be designed over an effective span of 8 m

to support a design service load of 50 kN/m. Adopt M-30 grade concrete and Fe-

415 HYSD bars.

7. Design a typical interior span of a continuous deep beam using the following data.

Span = 9 m

Overall depth = 4.5 m

Width of support = 0.9 m

Width of beam = 0.4 m

Uniformly distributed load at service state including the self weight = 200 kN/m

H.O.D. Staff-In-Charge

UNIT-IV

PART-A

1. Distinguish between ordinary-moment and ductile moment shear wall 2. Define Shear wall3. What is meant by boundary elements in shear walls? 4. Define coupled shear wall5. Under what condition boundary elements are to be provided in shear wall?

6. What is the shear strength of construction joints? 7. Write the importance of shear wall 8. Distinguish between braced and unbraced walls. 9. Write down the classification of shear wall. 10. Write a note on shear wall.

PART-B1. Design a bar bell type shear wall of length 4160mm & thickness 250mm

subjected to the following forces, fck=25N/mm2, fy=415N/mm2

Loading axial force moment shear force

DL+LL 1950 600 20 Seismic load 250 4800 700

2. Design a RCC wall of 5 m high, Which is restrained in position and direction at both ends and has to carry at its top a factored load of 600 kN and factored moment of 25 kNm, at right angles to the plane of wall.

3. Discuss in detail the different types of shear wall with neat sketches.4. Write short note on

a) Coupled shear wallb) Rigid frame shear wall

5. Design a RCC wall of 6 m high, which is restrained in position and direction at both ends and has to carry at its top a factored load of 800 kN and factored moment of 115 kNm, at right angles to the plane of wall.

6. Explain in detail about the step by step procedure of design of shear wall.

H.O.D. Staff-In-Charge

UNIT-V

PART-A1. What do you mean by ductility of concrete?2. Explain the effect of high temperature on concrete and steel3. How RCC elements are made ductile?4. Sketch the detailing of reinforcement in beam column joints for ductility.5. Define ductility6. Sketch the detailing of reinforcement in columns for ductility.7. What are the factors affecting fire resistance of RC structures?8. What is the effect of fire on tension members?9. List some of the methods to improve the fire resistance of buildings.10. What are the 2 ways of expressing the fire resistance of structural members?

PART-B1. Explain in detail about the reinforcement detailing of beams for ductility.2. Write a brief note on quality control of concrete in field3. What are the steps to be taken for providing fire resistance in buildings?4. Explain in detail the process of mixing, placing, compaction and curing of

concrete in the field.5. Write a brief note on factors to improve the ductility performance of R.C

structures under seismic loading.6. Explain in detail about the reinforcement detailing of beam- column joints for

ductility.7. Discuss the essential of workability and strength tests for the quality control of

concrete in field.

H.O.D. Staff-In-Charge