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Design Of Steel Structures
Quiz 2
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Q.1
The effect of racking forces is considered in the design of
i) lateral braces
ii) chord members
The correct answer is
only (i)
only (ii)
both (i) and (ii)
none of the above
Q.2
The heaviest I-section for same depth is
ISMB
ISLB
ISHB
ISWB
Q.3
The centrifugal force due to curvature of track is assumed to act on the bridge at a height of
1.23 m above the rail level
1.50 m above the rail level
1.83 m above the rail level
2.13 m above the rail level
Q.4
Bearing stiffener in a plate girder is used to
transfer the load from the top flange to the bottom one
prevent buckling of web
decrease the effective depth of web
prevent excessive deflection
Q.5
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
Q.6
Lacing bars in a steel column should be designed to resist
Bending moment due to 2.5% of the column load
Shear force due to 2.5% of the column load
2.5% of the column load
Both (A) and (B)
Q.7
The bracing between two columns of a steel tank will be designed to resist
horizontal shear due to wind or earthquake only
horizontal, shear due to wind or earthquake + 2.5% of column loads
column loads + 2.5% of horizontal shear due to wind or earthquake
column loads + full horizontal shear due to wind or earthquake
Q.8
Minimum pitch of the rivets shall not be less than (where d is gross diameter of rivet)
1.5 d
2.0 d
2.5 d
3.0 d
Q.9
Gantry girders are designed to resist
lateral loads
longitudinal loads and vertical loads
lateral, longitudinal and vertical loads
lateral and longitudinal loads
Q.10
In case of plastic design, the calculated maximum shear capacity of a beam as per IS:800 shall be (where, Aw = effective cross-sectional area resisting shear fy = yield stress of the steel)
0.55 Awfy
0.65 Awfy
0.75 Awfy
0.85 Awfy
Q.11
The forces acting on the web splice of a plate girder are
Axial forces
Shear and axial forces
Shear and bending forces
Axial and bending forces
Q.12
If the thickness of thinnest outside plate is 10 mm, then the maximum pitch of rivets in tension will be taken as
120 mm
160 mm
200 mm
300 mm
Q.13
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
Q.14
The slenderness ratio of a column supported throughout its length by a masonry wall is
zero
10
100
infinity
Q.15
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
Q.16
If the loaded length of span in meters of a railway steel bridge carrying a single track is 6 m, then impact factor is taken as
0
0.5
between 0.5 and 1.0
1.0
Q.17
The actual thickness of butt weld as compared to the thickness of plate is usually
more
less
equal
none of the above
Q.18
A circular column section is generally not used in actual practice because
it is uneconomical
it cannot carry the load safely
it is difficult to connect beams to the round sections
all of the above
Q.19
Minimum pitch provided in riveted steel tanks is (where d is diameter of rivets)
1.5 d
2.0 d
2.5 d
3.0 d
Q.20
The allowable tensile stress in structural mild steel plates for steel tank is assumed as
95.0 MPa on net area
105.5 MPa on net area
105.5 MPa on gross area
150.0 MPa on gross area
Q.21
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
Q.22
The connection of intermediate vertical stiffeners to the web, not subjected to external loads, shall be designed for a minimum shear force (kN/m) of
(where, t = the web thickness in mm h = the outstand of stiffener in mm)
75 t2/h
125 t3/h2
125 t2/h
175 t2/h
Q.23
Other conditions being same, the load factor in indeterminate structures is
Equal to load factor in determinate structures
More than the load factor in determinate structures
Less than the load factor in determinate structures
Unpredictable
Q.24
In case of timber structures, the simple bending formula M = fz may be applied for
rectangular beams up to 300 mm depth
all rectangular beams
solid circular beams only
all square cross-section beams
Q.25
As per IS : 875, for the purposes of specifying basic wind velocity, the country has been divided into
4 zones
5 zones
6 zones
7 zones
Q.26
Diameter of a bolt hole is usually taken as
gross diameter of bolt
nominal diameter + 1.5 mm
nominal diameter + 2.0 mm
nominal diameter of bolt
Q.27
Normally, the angle of roof truss with asbestos sheets should not be less than
26/2°
30°
35°
40°
Q.28
Pitch of tacking rivets, when double angles connected back to back and acting as tension members should not be more than
500 mm
600 mm
1000 mm
300 mm
Q.29
Efficiency of a riveted joint, having the minimum pitch as per IS : 800, is
40%
50%
60%
70%
Q.30
The moment-curvature relation at a plastic hinge is
linear
parabolic
constant moment for all curvatures
constant curvature for all moments
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