Download AKTU (Dr. A.P.J. Abdul Kalam Technical University (AKTU), formerly Uttar Pradesh Technical University (UPTU) B-Tech 6th Semester (Sixth Semester) 2016-2017 ECE601 Design Of Concrete Structures Ii Question Paper
B.TECH.
THEORY EXAMINATION (SEM?VI) 2016-17
DESIGN OF CONCRETE STRUCTURES II
T ime : 3 Hours Max. Marks : 100
Note .' Be precise in your answer. In case ofnumericalproblem assume data wherever not provided.
SECTION ? A
1. Explain the following: 10 X 2 = 20
(a) List the principles in design of strap footing.
(b) What are the advantages offered by ?at plates over conventional two way slabs with
supporting beams?
(c) List a few factors that affect the punching shear strength of ?at slabs.
(d) What are the situations in which combined footings are preferred over isolated
footings?
(e) Draw a typical reinforcement detail of combined rectangular and trapezoidal footings.
(1) Write short notes on segmental retaining walls.
(g) What are the two theories for calculating earth pressure on retaining wall?
(h) Define column head and drop.
(i) What is the need of prestressing?
(j) State the difference in load carrying mechanism in ?exure under working condition
between RCC and PSC.
SECTION ? B
2. Attempt any ?ve of the following questions: 5 X 10 = 50
(a) Design a combined footing for two columns carrying axial loads of 500 kN and 800
kN. Both columns are 30 cm in diameter and are spaced at 3m centre to centre.
Columns are reinforced with 18 mm bars and consist of M25 Grade. The bearing
capacity of the soil is 80 kN/m2.Use M30 & Fe415 grade steel.
(b) A 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 ?at
slab is 5 kN/mz. Determine the moments in the ?at slab along its 8m span.
(c) Discuss the following in detail.
(i) Merits and demerits of prestressed concrete.
(ii) Losses in prestress.
(d) Design a rectangular tank of 250 KL capacity in a space of 15m X 5m area .It is a
covered tank and placed 1m below the Ground level.
(e) Design a footing of 250 mm the masonry wall which supports a load of 150 kN /m and
moment of 15 kN m at service state. Consider,
Unit wt of soil = 20 kN /m3
Angle of repose = 30?, Allowable bearing capacity of soil = 150 kN /m2.Use M20 and
Fe415.
(1) Explain the Various methods of prestressing with neat sketches.
(g) Design the interior panel of a Flat slab with drops for an office ?oor to suit the
following data:
Size of office ?oor = 25 X 25 m
Size ofpanels = 5 m X 5 m
Loading class = 4 kN /m2.M20 and Fe415.
(h) Explain the general features and design principles of counterfort retaining wall.
SECTION ? C
Attempt any two of the following questions: 2 x 15 = 30
Design a T?shaped cantilever retaining wall for retaining 5 m high earth above the ground
level. Consider the weight of soil = 15 kN /m3.Angle of repose of soil = 30?, Coefficient of
friction at base = 0.5, Allowable bearing pressure of soil = 150 kN /m2. Grade M20 for
concrete and Fe415 for steel.
Design a circular tank with fixed base for capacity of 500000 litres .The depth of water is to be
5m.Free board = 300 mm. Use M20 grade concrete and Fe415 HYSD bars. Permissible direct
tensile stress in concrete = 1.2 N/mm2 Permissible stress in steel in direct tension = 100
N/mm2 Sketch the details of reinforcement in tank walls.
Design a strap footing for two columns spaced at 6 m 0/0 face of one of the column of section
400 mm X 400 mm and subjected to a load of 1000 kN at service coincides with the property
line and other column is of section 500 mm X 500 mm and subjected to a load of 1500kN at
service state.
Consider, Unit weight of soil = 15 kN /m3
Angle of repose = 30
Allowable bearing capacity of soil = 150 kN /m2
Grade M20 and Fe415.
This post was last modified on 29 January 2020