The web crippling due to excessive bearing stress can be avoided by
Increasing the web thickness
Providing suitable stiffener
Increasing the length of the bearing plates
None of the above
Correct Answer :
C. Increasing the length of the bearing plates
Related Questions
Factor of safety is the ratio of
Yield stress to working stress
Tensile stress to working stress
Compressive stress to working stress
Bearing stress to working stress
A 20 mm dia steel bar which is subjected to an axial tension of 2300 kg/cm2 produces a strain of 0.004 cm. If Young's modulus of steel is 2.1 × kg/cm2, the bar is
In the elastic range
In the plastic range
At yield point
None of these
The maximum permissible slenderness ratio of compression member carrying dead and superimposed load, is
180
200
250
350
The beam outside a wall upto floor level above it, is known as
Rafter
Purlin
Spandrel beam
Lintel
In case of cantilever fillers, the ratio of the span L to depth d, should not exceed
4
8
12
16
Pick up the correct statement from the following:
Dead load includes self-weight of the structure and super-imposed loads permanently attached to the structure
Dead loads change their positions and vary in magnitude
Dead loads are known in the beginning of the design
None of these
Angle of inclination of the lacing bar with the longitudinal axis of the column should preferably be between
10° to 30°
30° to 40°
40° to 70°
90°
For determination of allowable stress in axial compression, Indian Standard Institution has adopted
Euler's formula
Rankine formula
Perry Robertson formula
Secant formula
The elastic strain for steel is about
1/12 of strain at the initiation of strain hardening and about 1/120 of maximum strain
1/2 of strain at the initiation of strain hardening and about 1/12 of maximum strain
1/12 of strain at the initiation of strain hardening and 1/200 of maximum strain
1/24 of strain at the initiation of strain hardening and about 1/200 of maximum strain
For steel members not exposed to weather, the thickness of steel should not be less than
4.5 mm
6 mm
8 mm
10 mm
Long column is one
Which is more than 3 m long
Whose lateral dimension is less than 25 cm
Which is free at its top
Which has a ratio of effective length and least lateral dimension more than 15
For the economical design of a combined footing to support two equal column loads, the projections of beams in lower tier are kept such that bending moment under column is equal to
Bending moment at the centre of the beam
Half the bending moment at the centre of the beam
Twice the bending moment at the centre of the beam
None of these
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 = 0.7 L
l = 0.75 L
l = 0.85 L
l = 0.5 L
Normally, the angle of roof truss with asbestos sheets should not be less than
26 ½°
30°
35°
40°
If the depth of the section of an upper column is smaller than the lower column
Filler plates are provided with column splice
Bearing plates are provided with column splice
Filler plates and bearing plates are provided with column splice
None of these
Net sectional area of a tension member, is equal to its gross section area
Plus the area of the rivet holes
Divided by the area of rivet holes
Multiplied by the area of the rivet holes
None of these
The strength of a riveted lap joint is equal to its
Shearing strength
Bearing strength
Tearing strength
Least of (a), (b) and (c)
The mechanism method and the statical method give
Lower and upper bounds respectively on the strength of structure
Upper and lower bounds respectively on the strength of structure
Lower bound on the strength of structure
Upper bound on the strength of structure
According to IS : 800-1962 the permissible bending stress in steel slab plates, is
1500 kg/cm2
1420 kg/cm2
2125 kg/cm2
1890 kg/cm2
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)
Which of the following sections should preferably be used at places where torsion occurs?
Angle section
Channel section
Box type section
Any of the above
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
0.5 L
0.67 L
0.85 L
2 L
The effective length L of a simply supported beam with ends restrained against torsion, and also the ends of compression flange partially restrained against lateral bending, is given by
L = span
L = 0.85 span
L = 0.75 span
L = 0.7 span
The Indian standard code which deals with steel structures, is
IS : 875
IS : 800
IS : 456
IS : 1893
In a built up section carrying a tensile force, the flanges of two channels are turned outward
To simplify the transverse connections
To minimise lacing
To have greater lateral rigidity
All the above
Effective length of a column effectively held in position and restrained in direction at one end but neither held in position nor restrained in direction at the other end, is
1.5 L
0.67 L
0.85 L
2 L
Modified moment of inertia of sections with a single web, is equal to moment of inertia of the section about Y-Y axis at the point of maximum bending moment and is multiplied by the ratio of
Area of compression flange at the minimum bending moment to the corresponding area at the point of maximum bending moment
Area of tension flange at the minimum bending moment of the corresponding area at the point of maximum bending moment
Total area of flanges at the maximum bending moment to the corresponding area at the point of maximum bending moment
None of these
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
The channels get twisted symmetrically with regard to its axis
Parallel to flanges
Parallel to web
Perpendicular to flanges
Perpendicular to web
Bolts are most suitable to carry
Shear
Bending
Axial tension
Shear and bending