ST7101 Concrete Structures M.E Question Bank : valliammai.co.in

Name of the College : Valliammai Engineering College
University : Anna University
Department : Civil Engineering
Subject Code/Name : ST7101-Concrete Structures
Degree : M.E Structural Engineering
Year : I
Semester : I
Document Type : Question Bank
Website : valliammai.co.in

Download : https://www.pdfquestion.in/uploads/va…Structures.pdf

Valliammai Concrete Structures Question Bank

Unit -1 Design Philosophy :

Part – A

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1. Explain balanced, under-reinforced and over-reinforced section.
2. Differentiate oneway and twoway slab?
3. Explain the merits of limit state design?
4. What are the flanged beam?Explain neat sketch.
5. What is the use of partial safety factors?
6. What are slender columns?
7. Calculate the effective length of a column if its unsupported length is 4m when both ends arefixed?
8. What is meant by moment of resistance?
9. What is the necessity of doubly reinforced section?
10. What are the reason for cracks in structural concrete?
11. What are reinforcements provided required in a beam to support the combined effect of shear, bending moment, torsion?
12. List out the factors influencing the crack with reinforced concrete members?
13. Why is additional moment considered for long columns?
14. What is meant by cracking torque?
15. How does shrinkage of concrete lead to deflection in reinforced concrete flexural members?
16. What is the difference between short and long column?
17. What is meant by balanced failure?
18. What are the different options available to a designer with regard to control of cracking in flexural members?
19. What is the difference between deterministic design and probabilistic design?
20. What are the failures will occur in long column?

Part – B

1. A rectangular beam 200 mm wide and 400 mm deep up to the centre of reinforcement has to resist a factored moment of 40 kNm. Design the section. Use M25 concrete and Fe 500 steel.\
2. Discuss the issues involved in designing for achieving control over thermal and shrinkage cracking in large RC structures.
3. Determine the short term deflection of a simply supported beam 250 mm x 400 mm in size for the following data:
Span of the beam = 6 m
Effective cover = 40 mm
Area of tension steel = 3 Nos of 28 mm diameter bars
Live load = 10 kN/m.
4. A rectangular beam section of width 250 mm and effective depth 500 mm is subjected to an ultimate moment of 150 kNm, ultimate shear force of 60 kN and ultimate torsional moment of 20 kNm. Design the beam.
5. Briefly discuss torsion – shear interaction of reinforced concrete beams.
6. A rectangular simply supported beam of span 5 m in 300 x 600 mm in cross section and is reinforced with 3 bars of 20 mm on tension side at an effective cover of 50 mm. Determine the short term deflection due to an imposed working load of 25 kN/m, excluding self weight of beam. Assume grade of concrete M20 and grade of steel as Fe 500.
7. A simply supported reinforced concrete beam of rectangular section 250mm wide by 450mm overall depth is used over an effective span of 4m. The beam is reinforced with 3 nos.20mm dia Fe415 at an effective depth of 400mm. Two hanger bars of 10mm dia are provided. The self weight together with dead load on the beam is 4kN/m and service live load is 10 KN/m. UsingM20 grade concrete and Fe415 grade steel.Compute(a) Short term deflection (b)Long term deflection (c)Maximum crack width at tension face directly under bar
8. Design a biaxial eccentrically loaded braced rectangular column for the following data
Ultimate axial load = 2000kN
Ultimate biaxial moments = Mux=250kNm and Muy=150kNm
Unsupported length(l)=3.25m
Effective length lex=3m, ley=2.75m
Column section (b) in x-direction=400mm, D=600mm
Adopt M25 grade concrete and Fe415 grade steel
9. Design a T- beam for the following data :
bf : 750 mm
bw : 300 mm
Effective depth : 450 mm
Thickness of flange : 90 mm
Applied moment : 350 kNm.
Adopt M20 concrete and Fe 415 steel.
10. Design a short square column for the following data : lateral dimension : 500 mm, axial load : 2×106 N. Assume M20 concrete and Fe 415 steel.

Design Of Special RC Elements

Unit II  :
Part – A :
1. State the advantages of flat slabs.
2. What is meant by punching shear?
3. What are the modes of failure of deep beams?
4. Give any two characteristics of yield line.
5. What do you meant by coupled shear walls?
6. What is the main difference between a braced wall and an unbraced wall?
7. Why side face reinforcements are extremely important in deep beams?
8. Explain the arch action on the deep beam with the load transfer model?
9. What is a corbel? Explain with a neat diagram?
10. How do you calculate the lever arm for a deep beam?
11. What is a bracket? Where it is used?
12. Define shear wall.
13. Explain grid or coffered floor systems, with a neat sketch.
14. How a nib is different from cantilever? Draw a neat sketch.
15. What is the development length adopted for deep bemas? Calculate it for 16 mm mild bars in M20 grade concrete.
16. Explain the strut and tie method of analysis for a corbel, with the equation of lever arm (z/d).
17. What are the advantages of a flat slab over ordinary slab?
18. Explain the term drop and capital in flat slab.
19. What is a flat plate?
20. Explain the characteristic features of yield lines?

Part B :
1. Design a corbel for a 350mm square column to support an ultimate vertical load of 600kN with its Line of action 200mm from the face of the column. Use M20 grade concrete and Fe 415 grade steel.
2. Design a simply supported deep beam with width = 250mm, overall depth (D) = 3500mm, width Of supports = 500mm, clear span = 5m.Live load on the beam = 150kN/m at service state. Adopt M20 grade concrete and Fe415 steel.
3. R.C. grid floor is to be designed to cover a floor area of 12mx18m.The spacing of ribs in mutually Perpendicular directions is 1.5mc/c. Live load on the floor is 2kN/m. Analyse the grid floor by IS- 456 methods and design the suitable reinforcements with grid floor.
4. Design a single span deep beam with following data.
a) Effective span =6m
b) Over all depth=6m
c) Width of support=0.6m
d)width of beam =0.4m Total load on beam including self-weight 400kn/m .Use M20&Fe415.
5. Design a column of size 450 x 300 mm using M30 concrete and Fe 500 steel. Given lex = 6.0 m, ler = 5.5 m, Pu = 1500 kN, Mux = 45 kN-m at top and 30 kNm at bottom Mny = 40 kNm at top and 25 kNm at bottom. The column is bent in double curvature and assume a cover of 50 mm.
6. A plain traced concrete wall of dimensions 8 m high, 6 m long and 200 mm thick is restrained against rotation at its base and unrestrained at the ends. If it has to carry a factored total gravity load of 200 kN and a factored horizontal load of 8 kN at top. Check the safety of the wall. Assume fck = 25, fy = 500.
7. What is meant by shear wall? Write the step by step procedure for the design of rectangular shear wall with boundary element.
8. Design a RC corbel to carry load of 350 kN acting at a distance of 250 mm from the face to face of a column of size 300 x 450 mm. the corbel is provided on the 300 mm face, sketch the reinforcement details.
9. Explain the basis for the simplified code procedure for analyzing the design strength components of a biaxially loaded column with rectangular section.
10. Design the longitudinal reinforcement for a braced column, 300 mm x 500 mm, subject to a factored axial load of 1500 kN and factored moments of 70 kNm and 50 kNm with respect to the major axis and minor axis respectively at the top end. Assume that the column is bent in double curvature (in both directions) with the moments at the bottom end equal to 50 percent of the corresponding moments at top. Assume an unsupported length of 6.0 m and an effective length ratio of 0.85 in both directions. Use M30 concrete and Fe 415 steel.