B.E. 8th Semester (Civil) Class Test – I - 2018
Subject: STRUCTURAL ENGINEERING DESIGN – IV
Time: 2 Hrs.
Maximum Marks: 40
-:: 2 ::(b)
Note: Use of IS 456:2000 is permitted. Assume suitable data, if required
and mention it clearly. Draw neat sketches wherever required. Part
(a), worth (4) marks, is compulsory in each question. Attempt any
one part from (b) and (c), worth (16) marks, from each Question.
(CO1)
Q. 1.
(a)
(b)
(c)
What are the different types of combined footings and what
are the advantages of it?
Design the longitudinal reinforcement for a combined
rectangular footing for the two columns of size 400 mm x
400 mm and 600 mm x 600 mm, located 4.50 m apart centre
to centre. The columns carry factored axial loads of 900 kN
and 1500 kN respectively. The distance from the centre of
lighter column to the property line is restricted to 0.6 m.
Using M20 grade for concrete and Fe415 steel for
reinforcement. The safe bearing capacity of soil may be
taken as 150 kN/m2.
Draw the bending moment and shear force diagram for a
combined trapezoidal footing for the two columns of size
300 mm x 300 mm and 500 mm x 500 mm, located 5 m
apart centre to centre. The columns carry axial loads of
600 kN and 1000 kN respectively. The distance from the
centre of lighter column to the property line is restricted to
1.2 m and length of footing is restricted to 7.0 m. The safe
bearing capacity of soil may be taken as 150 kN/m2.
(CO2)
Q. 2.
(a)
Sketch typical reinforcement details in a counter fort
retaining wall?
Continued on Page (2)…
(c)
Design the heel slab of a counter fort retaining wall for
flexure, if: height from the bottom of base slab to the top of
horizontal earth backfill = 8.0 m; width of heel slab = 2.0 m;
width of toe slab = 1.7 m; thickness of base slab = 0.3 m;
thickness of retaining wall at top and bottom= 0.3 m; SBC of
soil = 180 kN/m2; coefficient of friction between soil and
concrete = 0.50; angle of internal friction Ф = 30°; density of
earth = 18 kN/m3; clear spacing of counter forts = 3.0 m;
thickness of counter forts = 0.5 m.
Design the stem of a cantilever retaining wall to retain an
earthen embankment with a horizontal top 4.18 m above
ground level. The total height of the retaining wall, from the
bottom of base slab to the top of the wall, is 4.5 m. Density
of earth may be taken as 15 kN/m3. Angle of internal friction
Ф = 30°. The safe bearing capacity of soil may be taken as
130 kN/m2. Take coefficient of friction between soil and
concrete as 0.52. Use M20 grade for concrete and Fe415
steel for reinforcement.
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