Answer all questions. Any data, if required may be suitably assumed and clearly indicated.

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Nov 15, 2013 (3 years and 6 months ago)

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M.TECH. DEGREE EXAMINATION

Branch: Civil Engineering

Specializ
ation


Computer Aided Structural Engineering

Model Question Paper

-

I

First Semester

MCE
SE
-

102 ADVANCED DESIGN OF CONCRETE STRUCTURES

(Regular


2011

Admissions)

Time : Three Hours







Max
imum : 100 marks


Answer all questions.

Any data, if required may be suitably assumed and clearly indicated.

Use of relevant codes are permitted

Use M
-
20 grade concrete and Fe
-
415 steel.


1 (a) Explain clearly the concept of strip method analysis of slabs
. (5 marks)


(b) Explain the “yield line” analysis and sketch the yield line pattern for a rectangular
slab with

(i)

All sided simply supported condition;

(ii)

(ii) Two sided simply supported and two sides fixed condition (5 mark
s)

(c) Design a reinforced rectangular grid floor of a conference room 12 m. x 16 m. with
the centre to centere spacing of ribs at 2 m. both ways. Assume the slab thickness is
approximately 1/20
th

of span, total load including self
-
weight is 6.5 kN/m
2
.Use
M
-
20
grade concrete and Fe
-
415 steel. Assume the grid floor is simply supported on all the four
sides. Also sketch the reinforcement details.






(15 marks)

OR


2.(a) Explain the concept of redistribution of moments in continuous beams (5 mark
s)


(b) Discuss the various methods for the analysis of grid floors. ( 5 marks)


(c) Design a continous beam of three spans supported on stone masonry piers of 300x
300mm. Clear span between supports is 8m. Thickness of RC slab is

120mm. Spacing of
continuous beams is 2.75m c/c. Self
-
weight of floor finish is 0.6 kN/m
2
. Design the
reinforcement for critical sections and sketch the details of reinforcement. (15 marks)


3 (a) Explain with figure the Rankine’s theory to determi
ne the lateral pressure on the
walls of bunker. (5 mark
s)

(b) Design a coal bunker of square shape with 2.5 m. sides to store 300 kN of coal
having a unit

weight of 9 kN/m
3
. Assume that angle of response of coal is 30
0

and the top
surface of retained coal is level. Sketch the reinforcement of sidewalls and hopper bottom
of bunker.










(20 marks)

OR

4 (a) Design and sketch the reinforcements of sla
b, beam and column of the Portal frame
of a hall 12 m. wide. The Portal frames are spaced at 3 m. interval with its base fixed.
Heightof frame from base to the centre of beam is 5 m. Take thickness of slab as 100
mm. Live load on slab is 2 kN/m
2
..








(20 marks)

(b) Write down the salient points to be noted in the detailing of reinforcement for Portal
frames.











(5 marks)


[P.T.O]


5. (a)Explain the classifications of shear wall. (10 marks)


(b) Design a shear wall of length 4.16m and thickness 250mm subject to the following
forces. Assume f
ck

= 25 and f
y

= 415 N/mm
2

and the wall is a high wall with the
following loadings:


Loading

Axial force(kN)

Moment (kNm)

Shear (kN)


1. DL + LL

1
950

600

20

2. Seismic load

250

4800

700



2T 16


4160
















760






380 380














(15 marks)

OR


6. (a) Expla
in the design procedure for continuous deep beams. (5 marks)

(b)Design a single span deep beam for effective span of 6m, overall depth of 6m. Width
of supports is 600mm. Total load on beam including self weight is 400 kN/m. Sketch
t
he reinforcement details. (20 marks)



7. (a)Explain the advantages and disadvatages of flat slabs (5 marks)


(b)Explain the design procedure for

orderly analysis of flat slab by equivalent frame
method.










(5 marks)


(c) Estimate the dimensions of a flat slab system (with drops) for a four storey
building with five spans of 7.5m in the longer direction, five spans of 6m in the
shorter

directions and a storey height of 3m. (15 marks)







OR

8. A flat slab floor has panels of 6.6 x 5.4m in X and Y directions between centers of
columns which are 450x 450mm in size.

It has an edge beam all around the periphery
of 250 x 500mm which carries an exterior wall of weight 6kN/m. The slab thickness
is 150mm and the characteristic live load it has to carry is 5.25 kN/m
2
. The height of
each storey is 3m.


(i)Analyse exteri
or frame in 6.6m direction and determine the distribution of moments.


(ii) Determine the maximum torsional moment produced in the edge beam.


(iii) Check whether the moment can be transferred to column without transferring it on
edge beam.









(25 marks)


3780


250

2T 16

250