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Steel Structure Design
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A second horizontal stiffener is always placed at the neutral axis of the girder if the thickness of the web is less than
d/225 for high tensile steel
d/250 for structural steel
Neither (A) Nor (B)
both (c) and (b)
If the unsupported length of a stanchion is 4 metres and least radius of gyration of its cross-section is 5, the slenderness ratio of the stanchion, is
70
60
80
90
100
When a tension member consists of two channel sections, the allowance for rivet hole is made for two holes from
each flange
each web or one hole from each flange whichever is less.
each web or one hole from each flange whichever is more
both webs
each web
When the depth of a plate girder is at least n times the depth of vertical leg of the flange angles, the girder is known as deep plate girder, if n is
8
6
10
4
2
The permissible bearing stress in steel, is
1890 kg/cm2
2250 kg/cm2
2025 kg/cm2
1500 kg/cm2
2340 kg/cm2
According to IS : 800-1962 the permissible bending stress in steel slab plates, is
1420 kg/cm2
1890 kg/cm2
2125 kg/cm2
1500 kg/cm2
When a tension member is made of four angles with a plate as a web, the allowance for holes is made as
None of these.
one hole for each angle and one hole for the web
two holes for each angle and two holes for the web
one hole for each angle and two holes for the web
two holes for each angle and one hole for the web
The channels get twisted symmetrically with regard to its axis
perpendicular to web.
parallel to flanges
parallel to web
perpendicular to flanges
In a truss girder of a bridge, a diagonal consists of mild steel flat4001.
S.F. and carries a pull of 80tonnes.
If the grossdiameter of the rivet is 26 mm, the number of rivets required in the splice, is
8
7
9
12
6
For a cantilever beam of length L built-in at the support and restrained against torsion at the free end, the effective projecting length l is
l = 0.75L
l = 0.5L
L = l
l = 0.7L
l = 0.85L
For a cantilever beam of length L continuous at the support and unrestrained against torsion at the support and free at the end, the effective length l is equal to
l = 3L
L = l
l = 3.5L
l = 0.5L
l = 2L
Design of a riveted joint is based on the assumption
None of these.
Stress in the plate in not uniform
Friction between plates is taken into account
Bending stress in rivets is accounted for
Riveted hole is assumed to be completely filled by the rivet
Outstanding length of a compression member consisting of a channel, is measured as
nominal width of the section
None of these.
half of the nominal width
from the edge to the first row of rivets
The least permissible clear dimension of the web of thickness t in the panel of a plate girder, is restricted to
160 t
180 t
150 t
200 t
170 t
Length of an outstanding leg of a vertical stiffener, may be taken equal to
th of clear depth of the girder plus 20 mm
th of clear depth of the girder plus 25 mm
th of clear depth of the girder plus 50 mm.
th of clear depth of the girder plus 15 mm
th of clear depth of the girder plus 50 mm
The ratio of shearing stress to shearing strain within elastic limit, is known as
tangent modulus of elasticity
modulus of elasticity
shear modulus of elasticity
All the above.
bulk modulus of elasticity
The moment of the couple set up in a section of a beam by the logitudinal compressive and tensile force, is known as
moment of resistance
bending moment
None of these.
flexural stress moment
In plastic analysis, the shape factor for circular sections, is
1.697
1.6
1.5
None of these.
Effective sectional area of a compression member is
gross sectional ares + area of rivet hole.
gross sectional area - area of rivet hole
gross sectional ares + area of rivet hole
gross sectional ares x area of rivet hole
The effective length of a double angle strut with angles placed back to back and connected to both the sides of a gusset plate, by not less than two rivets, is
0.85 L
0.5 l
0.67 L
2 L
L
1
2
5
9
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