T.Y. B. Arch. EXAMINATION, 2018
THEORY OF STRUCTURES—III
(BRIDGE 2008 PATTERN)
Time Three Hours Maximum Marks 100
N.B. Answer any 3 questions from each section.
(ii Answer should be written in separate answer-books.
(iii Neat diagrams must be drawn wherever necessary.
Figures to the right indicate full marks.
Use of non-programmable calculators and steel tables allowed.
(vi Assume suitable data if necessary.
(vii Use Fe415 steel and M20 grade concrete.
Section-I
1. Write short notes on any four
Stresses in an eccentrically loaded column and I.S. provisions
for the same.
Combined Footing Strip Foundation
Weep Holes in a Retaining wall
P.T.O.
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Rankine's Theory of Earth Pressures
Reinforcement detailing of a folded plate staircase
S.B.C of soil, List of Different Types of Soil and their S.B.C.
2. A rectangular column of size 250 × 600 is subjected to a load of
1075 kN and rests on a soil of S.B.C. of 260 kN/m2.
Design the base of the footing
Find the depth of the Footing and calculate Area of steel in both
directions
Draw a sketch of the reinforcement in plan and section and Make
a schedule of the footing
Check for oneway shear. against percentage of steel as
follows
Ast/bd Shear Stress in N/mm2
0.15 0.28
0.25 0.36
0.50 0.48
0.75 0.56
3. Design a R.C.C. doglegged staircase for an office building for the
following data
Width of the flight 1450
Floor to floor height 3400
[5357]-302 3 P.T.O.
Tread 290 mm, Number of treads-9 in each flight
The staircase is supported on 230 mm wide beams on outer
edges of landings
4. A Cantilever R.C.C. Retaining wall is as follows
Retained earth is on the vertical face of the stem.
Density of retained earth 16 kN/m3
Angle of repose 30º
Coefficient of friction 0.6
S.B.C. of soil 250 kN/m2
Density of concrete 25 kN/m3
Top width of stem 300 mm
Bottom width of stem 660 mm
Height of stem 5100 mm
Width of base 3200 mm
Toe Projection 700 mm
Depth of Base 600 mm
Check the stability of the Retaining wall with respect to sliding
and Over-Turning. Comment on same.
Design the Stem Reinforcement. Draw sketch of same.
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Section-II
5. Explain the concept of prestressing the process of pre
Tensioning.
A prestressed concrete beam of overall size 300 × 750 is simply
supported over a span of 11 m. The beam carries an udl
of 32 kN/m over its entire span exclusive of its self weight.
The prestressing tendons are located at a distance of 300 from
the base and provides a prestressing force of 2200 kN.
Calculate the extreme fibre stresses at Mid Span and at End
Span.
6. Two column of size 400 × 400 and 500 × 500 carry loads
of 1000 and 1300 kN respectively and are spaced 2.2 m apart
centre to centre and rest in a soil of S.B.C. of 225 kN/m2.
Find the plan dimensions of the combined footing. Draw a
sketch of the plan.
Write short notes on any two
1. Partial Factors of safety for load and Stresses in Limit
State Method
2. Plate Girder
3. Castellated Girder
4. Piles Types and Application
[5357]-302 5 P.T.O.
7. A compound Stanchion is made of 2 number ISMC 300 placed back
to back and these are to be laced.
Find the distance between the two so that they take maximum
load.
Explain the reasons for the above.
Find the maximum load it can carry if the stanchion is hinged at
both ends and has a height of 5.5 m. Multiply the S.R by 1.1 for
battened connections and by 1.05 for Laced connections
Design the Lacing system and Draw a sketch of the same
Stresses in N/mm2
40 198
50 183
60 168
70 152
8. Write short notes on any four with neat sketches
Basic Concept of Portal Frame.
Reinforcement Detailing for Beams and Columns in Earthquake
Resistant Structures.
Reinforcement Detailing for a Cylinderical Walled Water Tank.
Different Shapes of Compound Stanchions.
Reinforcement Detailing For a combined Footing.
Types of Retaining Walls and their Applications.