As per IS: 800, in the plastic design, which of the following pairs are correctly matched?
Working Loads Load factor
(i) Dead load 1.7
(ii) Dead Load + imposed load 1.7
(iii) Dead load + load due to wind or 1.3 seismic forces
(iv) Dead load + imposed load + load 1.7 due to wind or seismic forces
Of these statements
(i) and (ii) are correct
(i), (ii) and (iii) are correct
(ii) and (iii) are correct
Only (i) is correct
Correct Answer :
A. (i) and (ii) are correct
Related Questions
To keep the intensity of bearing pressure between the column base and concrete compressive and to vary from zero to 2P/BL, the ratio of the moment M to the axial load P should be
L/2
L/3
L/4
L/6
The maximum permissible span of asbestos cement sheets is
650 mm
810 mm
1250 mm
1680 mm
The maximum slenderness ratio of a steel column, the design of which is governed by wind or seismic forces is
150
180
250
350
The area Ap of cover plates in one flange of a built up beam, is given by
Ap = Zreqr + Zbeam/h
Ap = Zreqr + Zbeam/A
Ap = Zreqr × Zbeam/h
Ap = Zreqr - Zbeam/h
The failure of a web plate takes place by yielding if the ratio of the clear depth to thickness of the web, is less than
45
55
62
82
In double lacing, the thickness t of flat lacing is
t < 1/40 th length between inner end rivets
t < 1/50 th length between inner end rivets
t < 1/60 th length between inner end rivets
t < 1/70 th length between inner end rivets
The cross-section of a standard fillet is a triangle whose base angles are
45° and 45°
30° and 60°
40° and 50°
20° and 70°
A beam may be designed as a cased beam if
Section is of double open channel form with the webs not less than 40 mm apart
Overall depth and width of the steel section do not exceed 750 and 450 mm respectively
Beam is solidly encased in concrete with 10 mm aggregate having 28 days strength 160 kg/cm2
All the above
Efficiency of a riveted joint is defined as the ratio of
Least strength of a riveted joint to the strength of solid plate
Greatest strength of a riveted joint to the strength of solid plate
Least strength of a riveted plate to the greatest strength of the riveted joint
All the above
According to I.S. : 800 - 1871, lacing bars resist transverse shear equal to
1.0% of the axial load
2.0% of the axial load
2.5% of the axial load
3.0% of the axial load
If f is the maximum allowable bending stress in a tension member whose radius of gyration is r and depth is 2y, the required cross sectional area A is given by
A = My/fr²
A = My²/fr²
A = My/fr
A = My/f²r²
Pick up the correct statement from the following:
Tacking rivets are used if the minimum distance between centres of two adjacent rivets exceeds 12 t or 200 mm, whichever is less
Tacking rivets are not considered to calculate stress
Tacking rivets are provided throughout the length of a compression member composed of two components back to back
All the above
In factory buildings, the horizontal beams spanning between the wall columns supporting a wall covering, are called
Stringers
Trimmers
Girts
Lintels
The external wind pressure acting on a roof depends on
Degree of permeability of roof
Slope of roof
Both (A) and (B)
None of the above
A single angle in tension is connected by one leg only. If the areas of connecting and outstanding legs are respectively a and b, net effective area of the angle, is
a - [b/{1 + 0.35 (b/a)}]
a + [b/{1 + 0.35 (b/a)}]
a - [b/{1 + 0.2 (b/a)}]
a + [b/{1 + 0.2 (b/a)}]
Outstanding length of a compression member consisting of a channel, is measured as
Half of the nominal width
Nominal width of the section
From the edge to the first row of rivets
None of these
The distance between e.g. of compression and e.g. of tension flanges of a plate girder, is known as
Overall depth
Clear depth
Effective depth
None of these
To minimize the total cost of a roof truss, the ratio of the cost of truss to the cost of purlins shall be
1
2
3
4
The bending moment for filler joists at the middle of an intermediate span, is
WL²/10
- WL²/10
- WL²/12
WL²/12
In a fillet weld placed on the sides of the base, the metal experiences
Shear
Tension
Compression
All the above
The minimum width B of a solid casing for a cased beam, is equal to
B = b + 25 mm
B = b + 50 mm
B = b + 75 mm
B = b + 100 mm
The Indian standard code which deals with steel structures, is
IS : 875
IS : 800
IS : 456
IS : 1893
The bracing provided in the plane of end posts is called
Sway bracing
Portal bracing
Top lateral bracing
Bottom lateral bracing
For eccentrically loaded columns, the bending factor is
Cross-sectional area of column/Radius of gyration
Radius of gyration/Cross-sectional area of column
Cross-sectional area of column/Section modulus of the section
Section modulus of the section/Cross-sectional area of column
Shear buckling of web in a plate girder is prevented by using
Vertical intermediate stiffener
Horizontal stiffener at neutral axis
Bearing stiffener
None of the above
The greatest gauge of long rivets should not exceed (where d is the diameter of the holes).
2 d
4 d
6 d
8 d
The deflection of beams may be decreased by
Increasing the depth of beam
Increasing the span
Decreasing the depth of beam
Increasing the width of beam
The distance measured along one rivet line from the centre of a rivet to the centre of adjoining rivet on an adjacent parallel rivet line, is called
Pitch of rivet
Gauge distance of rivet
Staggered pitch
All the above
If the area of cross-section of a single angle discontinuous strut is 30 cm2 and allowable working stress corresponding to its slenderness ratio is 625 kg/cm2, the safe load carrying capacity of the member, is
10 tonnes
12 tonnes
15 tonnes
18 tonnes
If the pitch is 6 cm and rivet value is 4 tonnes, the number of rivets required for a riveted connection carrying an eccentric load of 15 tonnes at a distance of 30 cm from the centre line, is
6
8
10
15