INSTITUTE OF AERONAUTICAL ENGINEERING (AUTONOMOUS)

Code No: BST002

M.Tech- I Semester Regular Examinations, February 2017

ADVANCED REINFORCED CONCRETE DESIGN

(Structural Engineering) Time: 3 hours Max. Marks: 70

Answer ONE Question from each Unit All Questions Carry Equal Marks

All parts of the question must be answered in one place only

UNIT-I

1.(a) Discuss the Indian standard recommendation on design for torsion. Derive an

expression for developmental length of bars in tension.

[6M]

(b) A reinforced concrete wall is 100mm thick. Determine the critical ratio of horizontal

steel required to control the shrinkage cracks with grade 25 concrete and grade 415

steel. If 10mm grade steel at 300mm spacing is provided on both faces of the wall

estimate the spacing of the cracks and its width due to drop in temperature of 20oC.

assume the following data:

i. Drying shrinkage of concrete=100x10-6

ii. Coefficient of thermal expansion=10µ/oC

iii. Modulus of concrete in tension Ec=10 x 103N/mm

2

iv. Strength of concrete in tension=1.5N/mm2.

[8M]

2. (a) Discuss the various types of factors that are affecting the shear resistance of a

reinforced concrete structural member. What are the rules regarding the distribution of

secondary steel in members in direct tension?

[6M]

(b) Determine the reinforcement required for the rectangular beam section with the

following data:

Width of section: 300mm; Depth of Section: 500mm; Factored Bending moment:

65kN-m; Factored torsional 40 kN-m; Factored shear force: 70kN. Use M15 grade

concrete and Fe415 grade steel.

[8M]

UNIT-II

3. (a) State and elaborate the conditions for moment redistribution. Discuss the advantages

and disadvantages of moment redistribution method.

[6M]

(b) A rectangular slab 3.5m x 5m in size simply supported at the edges. The slab is

expected to carry a service load of 3kN/m2 and floor finish of 1kN/m

2. Use

M20 grade concrete and Fe 415 steel. Design the slab if (a) it is isotopically reinforced

(b) if it is orthotropically reinforced with µ=0.75.

[8M]

MODEL QUESTION PAPER - II

4. (a) Specify the basic principle of yield line analysis and state the predicting yield patterns

and locate the axes of rotation of slabs with different plan forms and boundaries.

[7M]

(b) Draw bending moment diagram for a beam, fixed at ends and carrying total

uniformly distributed load Wu after 20% redistribution. Determine the magnitude by

which point of contra flexure is shifted.

[7M]

UNIT-III

5. (a) Describe in detail regarding the term ribbed slabs and give the advantages and

disadvantages of the ribbed slabs.

[6M]

(b) Design the interior panel of a flat slab 5.6m x 6.6m in size for a super imposed load of

7kN/m2.

Provide two way reinforcement. Use M20 grade concrete and Fe415 grade of

steel.

[8M]

6. (a) Find the suitable dimension of a simply supported waffle slab of span 6.5m to be made

from the structural hollow clay blocks 300mm x 300mm x 250mm height with 20m

wall thickness. Determine the reinforcements required if the slab is to carry an imposed

load of 4.0kN/m2.

[8M]

(b) Discuss in detail regarding equivalent frame method of flat slabs and write the

limitations in the direct design method.

[6M]

UNIT-IV

7. (a) A reinforced concrete deep girder is continuous over spans of 9m apart, from center to

center. It is 4.5m deep, 300mm thick, and the supports are columns 900mm in width. if

the girder supports a uniformly distributed loads of 200kN/m including its own weight,

design the necessary steel assuming grade 20 concrete and Fe 415 steel.

[8M]

(b) Formulate and give the methods for the detailed and design procedure for deep beams

according to the Indian standard provision.

[6 M]

8. (a) Design a corbel to carry an ultimate load of 800kN at a distance of 250mm from the

face of a column of size 400mm x 400mm. Use M30 grade concrete and Fe 415 steel.

[10M]

(b) Classify and elaborate in detail description regarding deep beam? Formulate the design

of a member like deep beam with holes.

[4M]

UNIT –V

9. (a) Design longitudinal steel for a 500mm x 300mm column with ultimate load 2300kN,

Mux=300kN-m and Muy=120kN-m. Use M-20, Fe-415.

[8M]

(b) Give the details of Indian Standard code requirements of slenderness limits for a

structural component like a compression member.

[6M]

10.(a) Classify and derive the governing equation for the design of structural component like

short and axially loaded tied column.

[4M]

(b) Design a combined trapezoidal footing for two columns A and B, spaced meters centre [10M]

to centre. Column A is 300mm x 300mm in size and transfer a load of 600kN. Column

B is 400mm x 400mm in size and carries a load of 900kN. The maximum length of

column is restricted to 7 meters only. The safe bearing capacity of soil may be taken as

120kN/m2. Use M20 mix for concrete and Fe 415 steel.