Design of Steel Structures Quiz | Design of Steel Structures Short Questions and Answers

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Questions
41 The relation between intensity of wind pressure p and velocity of wind V is taken as
A pa V
B paV2
C p a (1/V)
D paV”2

Answer: paV2
42 For the buildings having a low permeability, the internal wind pressure acting normal to the wall and roof surfaces is taken as where p is basic wind pressure
A zero
B ±0.2p
C ± 0.5 p
D ±0.7p

Answer: ±0.2p
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43 Generally the purlins are placed at the panel points so as to avoid
A axial force in rafter
B shear force in rafter
C deflection of rafter
D bending moment in rafter

Answer: bending moment in rafter
44 To minimize the total cost of a roof truss, the ratio of the cost of truss to the cost of purlins shall be
A 1
B 2
C 3
D 4

Answer: 2
45 Normally, the angle of roof truss with asbestos sheets should not be less than
A 26’/2°
B 30°
C 35°
D 40°

Answer: 30°
46 The maximum permissible span of asbestos cement sheets is
A 650 mm
B 810 mm
C 1250 mm
D 1680 mm

Answer: 1680 mm
47 The range of economical spacing of trusses varies from
A L/3 to L/5
B L/4to2L/5
C L/3 to L/2
D 2L/5 to 3L/5 where L is span

Answer: L/3 to L/5
48 The maximum spacing of vertical stiffeners is where d is the distance between flange angles
A 1.33 d
B 1.25 d
C 1.5 d
D 1.75 d

Answer: 1.5 d
49 Rivets connecting flange angles to cover plates in a plate girder are subjected to
A horizontal shear only
B vertical load only
C both (a) and (b)
D None of these

Answer: horizontal shear only
50 Minimum spacing of vertical stiffeners is limited to where d is the distance between flange angles
A d/4
B d/3
C d/2
D 2d/3

Answer: d/3
51 Gantry girders are designed to resist
A lateral loads
B longitudinal loads and vertical loads
C lateral, longitudinal and vertical loads
D lateral and longitudinal loads

Answer: lateral, longitudinal and vertical loads
52 The forces acting on the web splice of a plate girder are
A axial forces
B shear and axial forces
C shear and bending forces
D axial and bending forces

Answer: shear and bending forces
53 Bearing stiffener in a plate girder is used to
A transfer the load from the top flange to the bottom one
B prevent buckling of web
C decrease the effective depth of web
D prevent excessive deflection

Answer: prevent buckling of web
54 Intermediate vertical stiffeners in a plate girder need be provided if the depth of web exceeds where t is thickness of web
A 50 t
B 85 t
C 200 t
D 250 t

Answer: 85 t
55 The web crippling due to excessive bearing stress can be avoided by
A increasing the web thickness
B providing suitable stiffeners
C increasing the length of the bearing plates
D none of the above

Answer: increasing the length of the bearing plates
56 Minimum thickness of web in a plate girder, when the plate is accessible and also exposed to weather, is
A 5 mm
B 6 mm
C 8 mm
D 10 mm

Answer: 6 mm
57 Horizontal stiffener in a plate girder is provided to safeguard against
A shear buckling of web plate
B compression buckling of web plate
C yielding
D all of the above

Answer: compression buckling of web plate
58 Shear buckling of web in a plate girder is prevented by using
A vertical intermediate stiffener
B horizontal stiffener at neutral axis
C bearing stiffener
D none of the above

Answer: vertical intermediate stiffener
59 The live load for a sloping roof with slope 15°, where access is not provided to roof, is taken as
A 0.65 kN/m2
B 0.75 kN/m2
C 1.35 kN/m2
D 1.50 kN/m2

Answer: 0.65 kN/m2
60 The internal pressure coefficient on walls for buildings with large permeability is taken as
A ± 0.2
B ±0.5
C ± 0.7
D 0

Answer: ± 0.7

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