INSTITUTE OF AERONAUTICAL ENGINEERING (Autonomous)

Dundigal, Hyderabad -500 043

DEPARTMENT OF CIVIL ENGINEERING

STRUCTURAL ENGINEERING

TUTORIAL QUESTION BANK

Course Name : ADVANCED REINFORCED CONCRETE DESIGN

Course Code : BST002

Class : I M. Tech, I Semester

Branch : CE

Year : 2016 – 2017

Course Coordinator : Dr. J S R Prasad, Professor, Department of Civil Engineering

Course Faculty : Dr. J S R Prasad, Professor, Department of Civil Engineering

OBJECTIVES

The Course should enable the students to: I. Understand the elastic properties of materials and mathematical formulations of its behavior

II. Calculate the bending stress distribution for 2D problems in rectangular and polar coordinates.

III. Analysis of stress and strain in three dimensions.

IV. Assess the torsion problems for different cross sections.

V. Determine the yield criterions for elastic problems in bending and torsion.

S

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QUESTION Blooms

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UNIT – I

BASIC DESIGN CONCEPTS

Part - A (Short Answer Questions)

1. What are the three methods of design of reinforced concrete structural

elements? Remembering 1

2. When do we go for doubly reinforced beams?

3. What do you mean by Characteristic Load? Remembering 1

4. Explain the limit state method of design. Remembering 1

5. Explain the limiting moment of resistance. Remembering 1

6. What do you mean by neutral axis? Remembering 1

7. State two assumptions made in working stress method? Remembering 1

8. What are the demerits of Working stress method? Remembering 1

9. Describe the basic qualities of good concrete. Remembering 1

10. Explain the basic parameters that influence the design of concrete mix. Remembering 1

11. Explain the following terms:

(a) Limit state

(b) Partial safety factor

(c) Characteristic strength

(d) Characteristic load

Remembering 1

12. Explain the following terms:

(e) Modulus of elasticity of concrete

(f) Central value measures

(g) Measures of dispersion

(h) Creep and shrinkage

Remembering 1

13. Name three situations other than doubly reinforced beams, where the

compression reinforcement is provided. Remembering 1

14. State the assumptions of the analysis and design of doubly reinforced

beams.

Remembering 1

15. State the minimum and maximum amounts of Asc and Ast in doubly

reinforced beams. Remembering 1

16. Name the two methods of solving the two types of problems of a doubly

reinforced beam. Remembering 1

17. What is meant by “Design shear strength of concrete τc” ? Remembering 1

18. How do you determine the critical sections for shear in a beam? Remembering 1

19. How do we design the shear reinforcement close to the support of a

beam? Remembering 1

20. How do we place the vertical stirrups in a beam?

Remembering 1

Part - B (Long Answer Questions)

1 Determine the moments of resistance Mu and service imposed loads on a

simply supported beam of effective span 10.0 m with b = 300mm, d =

500 mm, D = 550 mm and grades of concrete and steel are M20 and

Fe500, respectively for the two different cases employing direct

computation method (i) when Ast

is minimum acceptable and (ii) when

Ast

is maximum acceptable (consider below Figure).

Applying 1

2 Determine the moments of resistance Mu and service imposed loads on a

simply supported beam of effective span 10.0 m with b = 300mm, d =

500 mm, D = 550 mm and grades of concrete and steel are M20 and

Fe500, respectively for the two different cases using charts of SP-16:

(i) when Ast

is minimum acceptable and (ii) when Ast

is maximum

acceptable (consider below Figure).

Applying 1

3 Determine the moments of resistance Mu and service imposed loads on a

simply supported beam of effective span 10.0 m with b = 300mm, d =

500 mm, D = 550 mm and grades of concrete and steel are M20 and

Fe500, respectively for the two different cases employing tables of SP-

16: (i) when Ast

is minimum acceptable and (ii) when Ast

is maximum

acceptable (consider below Figure).

Applying 1

4 Determine the moment of resistance for the beams shown in Figures (a)

and (b) using M 20 and Fe 250 by direct computation method.

Figure (a) Figure (b)

Applying 1

5 Determine the moment of resistance for the beams shown in Figures (a)

and (b) given below using M 20 and Fe 250 by using charts of SP-16.

Figure (a) Figure (b)

Applying 1

6 Determine the moment of resistance for the beams shown in Figures (a)

and (b) given below using M 20 and Fe 250 by using tables of SP-16.

Figure (a) Figure (b)

Applying 1

7 Derive the governing equations of a doubly reinforced beam. Applying 1

8 Write down the steps of the solution by the two methods of each of the

two types of problems of a doubly reinforced beam. Applying 1

9 Determine the moment of resistance of the T-beam of Figure below.

Given data: bf = 1000 mm, Df = 100 mm, bw = 300 mm, cover = 50 mm,

d = 450 mm and Ast = 1963 mm2 (4- 25 T). Use M 20 and Fe 415.

Applying 1

10 Determine Ast,lim

and Mu,lim

of the flanged beam of Figure below.

Given data are: bf

= 1000 mm, Df = 100 mm, b

w = 300 mm, cover = 50

mm and d = 450 mm. Use M 20 and Fe 415.

Applying 1

11 Determine the moment of resistance of the simply supported doubly

reinforced flanged beam (isolated) of span 9 m as shown in Figure

below. Assume M 30 concrete and Fe 500 steel.

Applying 1

12 Name and explain the three different failure modes of reinforced

concrete beams under the combined effects of bending moment and

shear force.

Applying 1

13 On what parameters τc of beams without shear reinforcement depends ?

How do you get τc for different grades of concrete? Applying 1

14 How do you know the maximum shear stress of concrete beams τcmax

with shear reinforcement? Applying 1

15 How do we determine the minimum shear reinforcement in rectangular

and T-beams ? Why do we provide the minimum shear reinforcement? Applying 1

16 What are the three different ways to provide shear reinforcement?

Explain the method of design of each of them. Applying 1

17 State the conditions to be satisfied for the curtailment of tension

reinforcement when designing the shear reinforcement. Applying 1

UNIT - II

LIMIT ANALYSIS OF R.C. STRUCTURES

Part – A (Short Answer Questions)

1 What is difference between one-way and two-way slabs? Remembering 2

2 Why cover to be provided in design of reinforced concrete structures? Remembering 2

3 Classify the slabs according to the method of supports for slabs? Remembering 2

4 What are the methods of analysis of slabs? Remembering 2

5 How to determine the effective span for slabs as per IS:456? Remembering 2

6 What are the considerations that govern thickness of one way and two way

slabs Remembering 2

7 What are the requirements of reinforcement for ONE-WAY slabs as per IS:

456. Remembering 2

8 What are the requirements of reinforcement for TWO-WAY slabs as

per IS: 456. Remembering 2

9 How to differentiate one-way and two-way slabs? Remembering 2

10 Explain about yield line theory? Remembering 2

Part - B (Long Answer Questions)

1 Draw bending moment diagram for a fixed ended beam as shown in

Figure after 15% redistribution.

Applying 2

2 Draw maximum bending moment diagram for a fixed ended beam

carrying 15 kN/m load at a collapse as shown in Figure below.

Applying 2

3 Draw bending moment diagram after 20% redistribution for the fixed

ended beam carrying two point loads at collapse as shown in Figure

below.

Applying 2

4

Draw maximum bending moment diagram for a fixed ended beam

carrying 10 kN load at one third points as shown in Figure below.

Applying 2

W Total

L

6 m

15 kN/m

W/2

L/3 L/3 L/3

W/2

2m

10kN

2m 2m

10 kN

A B

5 A fixed ended beam carries a point load at a distance ‘a’ from the left

end and a distance ‘b’ from the right end. Sketch the maximum bending

moment diagram after 25% redistribution. Applying 2

6 Sketch the bending moment envelope after 30% maximum

redistribution for a fixed ended beam carrying 2 point loads of 10 kN

each at one-third points and a uniformly distributed load of 2kN/m over

a span of 9 m.

Applying 2

7 Design a simply supported roof slab for a room 8 m x 3.5 m clear in

size if superimposed load is 5 kN/m2. Use M25 mix and Fe 415 grad

steel.

Applying 2

8 Design a continuous one way slab having three equal spans of 3 m each

as shown in Figure below with the following data: imposed load = 2.5

kN/m2, Concrete grade = M25 and steel grade = Fe500.

Applying 2

9 Design a two-way slab for a room 5.5 m x 4.0 m clear in size if the

superimposed load is 5 kN/m2. Use M25 mix and Fe 415 grade steel for

the edges simply supported – corners not held down. Applying 2

10 Design a two-way slab for a room 5.5 m x 4.0 m clear in size if the

superimposed load is 5 kN/m2. Use M25 mix and Fe 415 grade steel for

the edges simply supported – corners held down.

Applying 2

UNIT-III

DESIGN OF RIBBED SLABS, FLAT SLABS

Part - A (Short Answer Questions)

1

Sketch neatly the components of following

(a) Flat slab

(b) Flat slab with drop panels

Remembering 3

2

Sketch neatly the components of following

(a) Flat slab with column head

(b) Flat slab with drop panel and column head

Remembering 3

3 Demonstrate the uses of column heads and Drop panels in the design

Flat slabs. Remembering 3

4 What is Punching Shear? Remembering 3

5 What are the constraints in the use of flat slabs in high rise concrete buildings?

Remembering 3

6 Mention the differences between two way slab and flat slab? Remembering 3

7 What are the benefits of flat slab over traditional RC slabs Remembering 3

8 Why slabs are not designed for shear? Remembering 3

9 What is the function of rib slab? Remembering 3

10 What are design considerations for ribbed slabs? Remembering 3

Part – B (Long Answer Questions)

A

3m 3m 3m

B C D

G E F

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UNIT-III DESIGN OF RIBBED SLABS, FLAT SLABS

PART-A (Short Answer Questions)

1 Define the term Flat Slab.

Remembering 1

2 Define the term ‘Panel’ in Flat Slab.

Understanding 2

3 Define the term ‘Drop’ in Flat Slab.

Understanding 2

4 Define the term ‘Column Head’ in Flat Slab.

Understanding 2

5 What are the methods of design of flat slabs as per code IS 456:2000?

Remembering 1

6 Explain the IS code specifications regarding the ‘column head’ and

‘drops’ provided in a flat slab Understanding 2

7 What are the functions of drop panel and column heads in a flat slab? Explain in detail with a sketch.

Applying 3

8 Explain the limitations of Direct Design Method of analyzing flat slabs.

Applying 3

9 What are the assumptions of equivalent frame method?

Remembering 1

10 What do you understand by the term “middle strip” and “column strip”?

Explain with the help of a diagram.

Understanding 2

11 What are the advantages of Flat slabs?

Understanding 2

12 What are the disadvantages of Flat Slabs?

Applying 3

13 What is the function of the drop panel in Flat slab design? Applying 3

14 What is the function of column capital in Flat slab design?

Remembering 1

15 Explain how the ‘unbalanced’ moment is transferred from the slab to the column in flat slabs.

Understanding 2

16 Discuss briefly how the effects of pattern loading can be included in Direct Design method.

1.

Remembering 1

1 Write down the Step by step procedure for flat slabs design? Applying 3

2 Explain about yield line theory? Applying 3

3

A flat slab is supported on 600 mm diameter circular columns spaced 8 m x 6 m apart in both directions. The column head has a diameter of 120 cm. The live load on the flat slab is 5 kN/m2. Determine the moments in the flat slab along its 8 m span.

Applying 3

4

A flat slab is supported on 600 mm diameter circular columns spaced 8 m x 6 m apart in both directions. The column head has a diameter of 120 cm. The live load on the flat slab is 5kN/m2. Determine the unbalanced moments in an interior column of the flat slab. Also check the flat slab in shear at an interior support.

Applying 3

5

A flat slab is supported on 600 mm diameter circular columns spaced 8 m x 6 m apart in both directions. The column head has a diameter of 120 cm. The live load on the flat slab is 5 kN/m2. Check the flat slab in shear at an interior support and at an edge column.

Applying 3

17 Discuss briefly how the effects of pattern loading can be included in Equivalent Frame Method.

2.

Understanding 2

18 Explain the concept of ‘Equivalent column’ in the Equivalent Frame Method Understanding

2

19 What is the difference between one-way shear and two-way shear in column supported slab systems?

3.

Understanding 2

20 How is punching shear stress calculated in column supported slab systems?

Applying 3

21 What are the characteristics of Ribbed floors?

Remembering 1

22 What are the advantages of Ribbed floors? Understanding 2

23 What are the disadvantages of Ribbed floors?

Remembering 1

24 What are the limitations of Direct Design method? Understanding 2

Part-B &C (Long Answer and Analytical Answer Questions)

1 A flat slab is supported on 600 mm diameter circular columns

spaced 8 m x 6 m apart in both directions. The column head has a

diameter of 120 cm. The live load on the flat slab is 5 kN/m2.

Determine the moments in the flat slab along its 8 m span.

Applying 2

2 A slab is supported on columns spaced at 6 m c/c apart in both

directions. The sizes of the column and column head are 500 x 500

mm and 750 mm x 750 mm as shown in Figure below. The

superimposed dead and live loads are 2 kN/m2 and 4 kN/m2. The

height of the floor is 5 m. Design the slab.

Applying 2

3 Design an interior panel of a flat slab for a live load of 4 kN/m2. The slab is provided with a floor finish of 1 kN/m2. The panels are 6 m x 6 m. Drops shall be provided. Use M20 concrete and Fe 415 steel.

Applying 2

4 A hall of 30 m x 42 m is to be constructed and a flat slab is to be provided. Plan the geometry of the flat slab with rectangular panels.

Understanding 1

5 Explain briefly the ‘equivalent frame’ concept. Also sketch the variations of moments in a typical two-way slab panel supported on flexible beams.

Understanding 1

Figure: PLAN OF INTERIOR

PANEL

C/L

C/L C/L

C/L

C/L C/L

3000

750 X 750

COLUMN

HEAD

3000 3000 3000

COLUM

N

STRIP

COLUM

N

STRIP

MIDDLE

STRIP

3000

3000

COLUM

N

STRIP

COLUM

N

STRIP

MIDDLE

STRIP

6 Briefly describe the ‘Direct Design Method’ and compare it with the Equivalent Frame Method. Understanding 2

7 Explain how shear forces in beams are estimated in two-way slab systems

supported on flexible beam.

Understanding 2

8 Suggest suitable reinforcement details for resistance against punching

shear in flat slabs and flat slabs.

Understanding 1

9 Design an interior panel of a flat slab with following data:

Size of floor = 20 m x 20 m Size of panels = 5 m x 5 m Live load = 4 kN/m2 Size of columns = 500 mm diameter Use M20 concrete and Fe 415 HYSD bars. Drops are to be provided

Applying 2

10 Determine the design moment for the interior and exterior panels for the

slab column system without drop and without column head with the

following data:

Slab = 20 m x 30 m Panel size = 4 m x 6 m Live load = 4 kN/m2 Finishes = 1 kN/m2 Size of the columns = 500 mm x 500 mm Floor to floor height = 4.0 m Use M20 concrete and Fe 415 steel.

Applying 2

S.No. QUESTION

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UNIT-IV DESIGN OF REINFORCED CONCRETE DEEP BEAMS AND CORBELS

PART-A (Short Answer Questions)

1 What is reinforced concrete deep beam?

Remembering 1

2 On what factors behavior of Deep beam depends?

Understanding 2

3 What is the IS 456: 2000 code provisions for the design of simply supported deep beams?

Applying 1

4 Enumerate the steps of designing deep beams as per IS 456:2000.

Understanding 1

5 How to determine the lever arm for a deep beam as per IS 456:2000?

Remembering 1

6 What is the effect of side cover on the shear strength of RC deep beam?

Remembering 2

7 What is the effect of depth of beam on shear strength of RC deep beam?

Remembering 2

8 Give the characteristics of Corbel or bracket.

Remembering 1

9 What is the tensile reinforcement required to resist positive bending moment in any span of a deep beam?

Applying 1

10 What are the provisions given by IS 456:2000 on negative reinforcement of deep beams?

Remembering 2

Part-B (Long Answer and Analytical Answer Questions)

1 What is the influence of compressive strength of concrete on the shear strength of RC deep beam?

Understanding 1

2 What is the effect of tension reinforcement on the shear strength of RC deep beam?

Understanding 2

3 What is the effect of Vertical Web Reinforcement on the shear strength of RC deep beam?

Understanding 2

4 What is the effect of Horizontal Web Reinforcement on the shear strength of RC deep beam?

Understanding 1

5 What is the effect of aggregate interlock on the shear strength of RC deep beam?

Understanding 2

6 What is the effect of Effect of Shear Span-to-Depth Ratio and Effective Span-to-Depth Ratio on the shear strength of RC deep beam?

Understanding 1

7 Discuss on the Modes of Failure of RC deep beams.

Applying 2

8 Enumerate step-by-step design procedure for Corbels.

Remembering 1

9 Enumerate step-by-step design procedure for Nibs.

Remembering 1

10 Design a corbel from the elevation details of corbel given in the figure below.

Applying 2

11 Design a concrete nib using the Figure given below.

Reinforced concrete in-situ floor beams with nibs to carry precast floor

units Clear gap between beams = 4.5 m Width of floor units = 400 mm Depth of floor units = 100 mm False floor + finish on units = 2.5 kN/m2 Imposed load on floor = 5.0 kN/m2 Grade of concrete for beam = C40 Assume dry bearing

Applying 2

S.No. QUESTION

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UNIT V DESIGN OF COMPRESSION MEMBERS

Part-A (Short Answer Questions)

1 Define effective length of a column.

Remembering 1

2 What is meant by slenderness ratio of a compression member and what are its implications?

Remembering 1

3 Distinguish between (i) unsupported length and effective length of a compression member; (ii) braced column and unbraced column.

Understanding 2

4 Why does the code require all columns to be able to resist a minimum eccentricity of loading?

Remembering 1

5 Why does the code specify limits to the minimum and maximum reinforcement in columns?

Applying 2

6 A short column, 600 mm x 600 mm in section, is subject to a factored axial load of 1500 kN. Determine the minimum area of longitudinal steel to be provided, assuming M20 concrete and Fe 415 steel.

Applying 2

7 Enumerate the functions of the transverse reinforcement in a reinforced concrete column.

Remembering 1

8 Explain the limitations of the traditionally working stress method with

regard to the design of axially loaded reinforced concrete column.

Remembering 1

9 Compare the behavior of tied columns with spiral columns, subject to axial loading.

Understanding 2

10 Sketch a typical axial load-moment interaction curve for a column and explain the salient point on it.

Understanding 2

Part-B&C (Long Answer and Analytical Answer Questions)

1 A column is subject to a uniaxially eccentric load which results in a point

(on the interaction diagram) that lies (i) marginally outside (ii) marginally

inside the envelope of the ‘design interaction curve’. Comment on the

safety of the column for the two situations.

Applying 2

2 Explain the reinforcement arrangement details underlying the design

interaction curve given in SP: 16 for the condition “rectangular section

with reinforcement distributed equally on four sides”.

Applying 2

3 Briefly explain the difficulties in a rigorous analysis for the design

strength components of a given rectangular column section under biaxial

loading.

Understanding 1

4 Explain the basis for the simplified codal procedure for analyzing the

design strength components of a biaxially loaded column with rectangular

cross section.

Understanding 1

5 What is the main difference in terms of structural behavior, between a

‘short column’ and a ‘slender column’?

Applying 2

6 Distinguish between ‘member stability effect’ and ‘lateral drift effect’ in

slender column behavior.

Applying 2

7 Classify the columns based on types of reinforcement, loadings and

slenderness ratios.

Applying 2

8 Identify and explain the functions of bracing in a braced column.

Understanding 1

9 Determine the minimum and maximum percentage of longitudinal

reinforcement.

Understanding 1

10 Determine the minimum numbers and diameter of bars in rectangular and circular columns. Determine the type, pitch and diameter of lateral ties of columns after determining the longitudinal steel. Applying 2

11 State the assumptions in the design of compression member by limit state

of collapse.

1.

Remembering 1

12 Determine the strain distribution lines of a compression member subjected

to axial load with or without the moments about one or both the axes. 2.

Applying 1

13 Explain the need of the minimum eccentricity to be considered in the

design of compression members. 3.

Understanding 1

Prepared By:

Dr. J S R Prasad

Professor

CE