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Structural Design Specifications
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Structural Design Specifications
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The value of the constant K in the formula for determining the minimum area of tension reinforcement in a beam is
0.95
0.90
0.80
0.85
In compression members, the lap length of a bar should not be less than
20 φ
12 φ
30 φ
16 φ
24 φ
For concreting of heavily reinforced sections without vibration, the workability of concrete should be
very low
high.
Medium
Low
In the formula
Both (c) and (d) of above.
A and B are the dimensions of the column
B is the lesser projection of the plate beyond the column
A and B are the dimensions of the base plate
A is the greater projection of the plate beyond the column
The flat slab is a reinforced concrete slab with or without drops and is supported
on columns with column head
on columns without column head
None of these.
on beams
The grade of plain concrete to be used in sea water or structures exposed to sea water, should be
M 20
M 15
M 30
M lO
The value of E for allowable compressive stress for columns, in the formula is taken as
2000000 kg/cm2
2044000 kg/cm2
2045000 kg/cm2
2047000 kg/cm2
M 30 grade concrete means, its compressive strength of 15-cm cube, is 30 N/mm2 after
7 days
28 days
21 days
3 days
The concrete may be accepted if the average equivalent cube strength of the cores, is at least 85% of the cube strength of the concrete grade at the specified age and no individual core possesses strength less than
90%
70%
85%
75%
80%
A continuous beam shall be deemed to be a deep beam if the ratio of its effective span to overall depth, is
2.5
less than 2
less than 2.5
2.0
The slenderness ratio of single angle discontinuous struts conmected by a single rivet or bolt, shall not exceed
110
130
180
150
The permissible bending stresses Pbet for steel slab bases should not exceed
1800 kg/cm2
1890 kg/cm2
1650 kg/cm2
1500 kg/cm2
As per IS : 800-1982, the coefficient of expansion for steel per degree centigrade per unit length, is
0.000014
0.000011
0.000013
0.000012
The outstand of stiffeners should be (where t is the thickness of flat)
8 T
12 T
6 t
10 T
The individual part of the structures is subjected to a load test for 24 hours by applying a load equal to full dead load of the structure plus
1.15 times imposed load
imposed load
1.25 times imposed load
1.3 times imposed load.
The characteristic strength of concrete is the strength of material if its test result is not less than
4%
2%
3%
10%
5%
If a column is subjected to dead load and super imposed load only, the maximum ratio should not be greater than
350
400
180
250
Pick up the correct precaution while spilicing the reinforcing bars
These are staggered
All the above.
These are provided if the B.M. is more than 50% of M.R.
These are provided away from the sections of maximum stress
Not more than half the bars are spliced at a section
The total area of side face reinforcement, in case of a deep beam should not be less than
0.3% of web area
0.1% of web area
0.2% of web area
0.4% of web area.
The pH value of water to be used in concrete shall generally be
not more than 6
not less than 6
not less than 5
not more than 7
For spans upto 10 m, the safe span to depth ratio for
cantilever is 7
All the above.
continuous beams is 26
simply supported beams is 20
For design purpose, the moment at the support where two unequal spans or spans not equally loaded meet, is
greater value
None of these.
average of two values
lesser value
For the plain reinforcing bars in compression, the permissible design bond stress in tension, is increased by
15%
30%
25%
20%
10%
If fck is the characteristic cube strength of concrete in N/mm2, the modulus of elasticity of structural concrete Ec = afck where the value of a, is
5500
5700
5600
5800
5900
For deformed reinforcing bars, the permissible design bond stress may be increased by
30%
20%
40%
50%
60%
The thickness of the steel
in secondary members not directly exposed to weather shall be not less than 4.5 mm
in main members not directly exposed to weather should not be less than 6 mm
All the above.
exposed to weather and accessible for repainting, should be not less than 6 mm
If fck is characteristic compressive strength of concrete, the flexural and split tensile strength fcr = afck N/mm2 where the value of a is
0.7
0.6
0.5
0.8
0.4
The minimum area of cross section of reinforcement in either direction of a slab should not be less than ...... of the slab cross section
0.15%
0.10%
0.75%
0.20%
Moist sand may contain surface water by mass upto
5.0%
1.25%
2.5%
7.5%
For the reinforced concrete member totally immersed in sea water, the normal cover provided for the reinforcing bars is further increased by
20 mm
30 mm
40 mm
50 mm
10 mm
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