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Seat No.: Enrolment
GUJARAT TECHNOLOGICAL UNIVERSITY
ME SEMESTER-1 EXAMINATION WINTER 2018
Subject Code: 3712012 Date: 02/01/2019
Subject Name: Advanced Concrete Design
Time: 02:30 PM To 05:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full mark.
4. Permit Use of IS: 456 IS:13920 IS: 3370 Part II, III, SP:16
Q.1
A
Explain the serviceability criteria for flexural member and compression member.
3
B
Explain the differences in analysis of bunker wall and silo wall
4
C
A simply supported T-beam (Flange 2200 x 100mm; Web 300 x 600mm and provided with 3-25mm diameter reinforcement with effective cover of 50mm) of 9 m span is subjected to dead load of 9 kN/m and imposed loads of 12 kN/m at service. Calculate the short- and long-term deflections and check the requirements of IS 456. Use M 25 and Fe 415.
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Q.2
A
Write down the steps for the design of shear wall.
4
B
Explain P-Δ effect on slender column.
Determine final additional moments of a slender column with following data. Column size is 300 mm x 450 mm. Grades are M30 and Fe 415. Effective length for bending parallel to larger dimension and that of shorter dimension is 6 m and 5 m respectively. Unsupported length is 7 m. Factored load is 1600 kN. Factored moment in direction of larger dimension is 40 kN.m at top and 20 kN.m at bottom while in direction of shorter dimension is 30 kN.m. at top and 20 kN.m. at bottom. Assume Pt 3%. The column is bent in double curvature and reinforcement is distributed equally on four sides.
10
OR
B
Determine the thickness and reinforcements for a simply supported transfer girder of length 6m loaded from two columns at 2.0m from each end with 3500 kN. The total depth of the beam is 4.5m and width of the supports is 450mm. Assume fck 40 MPa and Fe 415 steel.
10
Q.3
A
Draw a neat sketch of a shear wall with boundary element showing all the details of reinforcement. Assume suitable data. No calculations required.
4
B
Design a circular bunker for storing 80 Tonnes of coal if the density of coal is 9 kN/m3. Consider angle of repose 300. Design supporting columns and draw reinforcement detailing. Use M-25 grade concrete and Fe-415 grade steel.
10
OR
Q.3
A
What is the usual relationship between pile diameter and thickness of pile cap adopted in practice.
4
B
Design an internal panel of flat slab with floor finish 1 kN/m2, live load 4 kN/m2 is supported at 5 m X 5 m c/c by columns of size 300 mm x 300 mm. Column heads and slab drops are to be provided. Check the slab for shear and design reinforcement in column strip and sketch the reinforcement details. Use M-25 grade concrete and Fe-415 grade steel.
10
2
Q.4
A
The plan of a mat foundation with column loads is shown in the figure 1. Calculate the soil pressures at the four corners of the mat. Determine the thickness of the slab and reinforcement requirement in the Y-direction for the hatched portion. Take Fck as 25 MPa and Fe 415 and allowable soil pressure is 150 kN/m2.
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OR
Q.4
A
A column of size 1500 mm x 1500 mm carrying Pu=40000 kN, Mux=2000 kNm, Muy=1000 kNm is supported by a pile cap 2000 mm thick resting on 6 piles of 1500 mm diameter each at 4000 mm c/c in X-direction and 6000 mm c/c in Y-direction as shown in fig 2. Determine the pile loads and Design the reinforcement in pile cap. Draw a neat sketch showing the details of the design.
14
Q.5
A
Design a corbel to support an ultimate load of 600 kN at a distance 200 mm from a wall support. The load is transmitted from a bearing pad of length 300 mm. Concrete grade is 40.
7
B
A grid floor has 100 mm thick slab, floor finish kN/m2, live load 3.5 kN/m2 is provided for a hall with overall dimensions of 15 m x 15 m c/c with wall on outer periphery only and 9 interior beams in both direction forming a slab panel of size 1.5m x 1.5m. Assume all beams of size 200 x 700mm (including slab thickness). Calculate the maximum bending moment and maximum shear force and also design reinforcement in central beam of 15 m long. Use Rankine Grashoff or IS method. Use M-25 grade concrete and Fe-415 grade steel.
7
OR
Q.5
A
Affix the dimensions of Intz type water tank having capacity of 1000 m3. The height of staging is 15 m up to the bottom of tank. Design top dome and top ring beam of the tank.
7
B
The supporting shaft of an Intz water tank is 3 m internal diameter and 250 mm thick. Design the reinforcement and verify all the necessary checks in the shaft for combination of working axial load of 6500 kN working bending moment 1000 kNm for dead load and wind load combination.
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Fig 1 Fig 2