Working shear stress on the gross area of a rivet as recommended by Indian Standards, is
785 kg/cm2
1025 kg/cm2
2360 kg/cm2
None of these
Correct Answer :
B. 1025 kg/cm2
Related Questions
Stiffeners are used in a plate girder
To reduce the compressive stress
To reduce the shear stress
To take the bearing stress
To avoid bulking of web plate
With a percentage increase of carbon in steel, decreases its
Strength
Hardness
Brittleness
Ductility
A second horizontal stiffener is always placed at the neutral axis of the girder if the thickness of the web is less than
d/250 for structural steel
d/225 for high tensile steel
Both (c) and (b)
Neither (a) nor (b)
With usual notations of the letters, the shear stress fs at any point of the cross-section is given by
fs =FQ/It
fs =Ft/IQ
fs =It/FQ
fs =IF/Qt
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 difference between gross diameter and nominal diameter for the rivets up to 25 mm diameter is
1.0 mm
1.5 mm
2.0 mm
2.5 mm
The range of economical spacing of trusses varies from
L/3 to L/5
L/4 to 2L/5
L/3 to L/2
2L/5 to 3L/5, where L is span
The permissible stress in bending for rolled steel I-beams and channels, is
1500 kg/cm2
1575 kg/cm2
945 kg/cm2
1650 kg/cm2
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°
Design of a riveted joint, is based on the assumption:
Load is uniformly distributed among all the rivets
Shear stress on a rivet is uniformly distributed over its gross area
Bearing stress in the rivet is neglected
All the above
For a single section used as a tension member, the given area is assumed
20% to 30% in excess of the net area
30% to 40% in excess of the net area
40% to 50% in excess of the net area
50% to 60% in excess of the net area
When the bolts are subjected to reversal of stresses, the most suitable type of bolt is
Black bolt
Ordinary unfinished bolt
Turned and fitted bolt
High strength bolt
In rolled steel beams, shear force is mostly resisted by
Web only
Flanges only
Web and flanges together
None of these
Battening is preferable when the (i) Column carries axial load only (ii) Space between the two main components is not very large (iii) Column is eccentrically loaded The correct answer is
Only (i)
Only (iii)
(i) and (ii)
(ii) and (iii)
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
According to IS Specifications, the maximum pitch of rivets in compression is
Lesser of 200 mm and 12 t
Lesser of 200 mm and 16 t
Lesser of 300 mm and 32 t
Lesser of 3 00 mm and 24 t Where t is thickness of thinnest outside plate or angle
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
Compression force in two end posts, the pin of a rocker bearing in a bridge is designed for
Bearing and shear
Bending and shear
Bearing and bending
Bearing, shear and bending
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
The stress in the wall of a thin cylinder subjected to internal pressure, is
Hoop compression
Shear
Torsional shear
Hoop tension
In case of plastic design, the calculated maximum shear capacity of a beam as per IS: 800 shall be
0.55 Aw.fy
0.65 Aw.fy
0.75 Aw.fy
0.85 Aw.fy Where, Aw = effective cross-sectional area resisting shear fy = yield stress of the steel
Minimum pitch of the rivets shall not be less than
1.5 d
2.0 d
2.5 d
3.0 d Where d is gross diameter of rivet
Effective length of a column effectively held in position at both ends and restrained in direction at one end, is
L
0.67 L
0.85 L
1.5 L
On steel structures the dead load is the weight of
Steel work
Material fastened to steel work
Material supported permanently
All the above
If d is the distance between the flange angles, the vertical stiffeners in plate girders are spaced not greater than
d
1.25 d
1.5 d
1.75 d
The basic wind speed is specified at a height 'h' above mean ground level in an open terrain. The value of 'h' is
10 m
20 m
25 m
50 m
The internal pressure coefficient on walls for buildings with large permeability is taken as
± 0.2
±0.5
± 0.7
0
The bending moment for filler joists at the middle of an intermediate span, is
WL²/10
- WL²/10
- WL²/12
WL²/12
Horizontal stiffener in a plate girder is provided to safeguard against
Shear buckling of web plate
Compression buckling of web plate
Yielding
All of the above
The effective length of a compression member of length L held in position at both ends but not restrained in direction, is
L
0.67 L
0.85 L
1.5 L