To keep the intensity of bearing pressure between the column base and concrete, compressive throughout the length of the column base, the ratio of the moment M to axial load P should be
< L/3
< L/6
> L/3
> L/6
Correct Answer :
B. < L/6
Related Questions
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
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 effective length of a battened strut effectively held in position at both ends but not restrained in direction is taken as
1.8 L
L
1.1 L
1.5 L
The slenderness ratio of lacing bars should not exceed
100
120
145
180
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
As compared to field rivets, the shop rivets are
Stronger
Weaker
Equally strong
Any of the above
If d is the distance between the flange angles,
Vertical stiffeners are provided in steel plate girders if the web is less than d/85
Vertical stiffeners are provided in high tensile steel plate girders if the web is less than d/175
Horizontal stiffeners are provided in steel plate girders if the web is less than d/200
All the above
The load on a lintel is assumed as uniformly distributed if the height of the masonry above it, is upto a height of
The effective span
1.25 times the effective span
1.50 times the effective span
2.0 times the effective span
When the axis of load lies in the plane of rivet group, then the rivets are subjected to
Only shear stresses
Only tensile stresses
Both (A) and (B)
None of the above
The number of seismic zones in which the country has been divided is
3
5
6
7
Minimum thickness of web in a plate girder, when the plate is accessible and also exposed to weather, is
5 mm
6 mm
8 mm
10 mm
Load factor is
Always equal to factor of safety
Always less than factor of safety
Always greater than factor of safety
Sometimes greater than factor of safety
The allowable shear stress in the web of mild steel beams decreases with
Decrease in h/t ratio
Increase in h/t ratio
Decrease in thickness
Increase in height Where 'h' is height and t is thickness
Rolled steel beams are designated by Indian Standard series and its
Weight per metre and depth of its section
Depth of section and weight per metre
Width of flange and weight per metre
Weight per metre and flange width
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 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
In a grillage footing, the maximum shear force occurs at the
Edge of grillage beam
Centre of base plate
Centre of grillage beam
Centre of base plate
In a tension member if one or more than one rivet holes are off the line, the failure of the member depends upon:
Pitch
Gauge
Diameter of the rivet holes
All the above
A structural member subjected to tensile force in a direction parallel to its longitudinal axis, is generally known as
A tie
A tie member
A tension member
All the above
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
As per ISI, rolled steel beam sections are classified into
Two series
Three series
Four series
Five series
If fbt and fc are the co-existent bending tensile stress and shear stress in a member, the equivalent stress fc is
√(fbt² + fc²)
√(fbt² + ½fc²)
√(fbt² + 3fc²)
√(fbt² - 3fc²)
Efficiency of a riveted joint, having the minimum pitch as per IS : 800, is
40 %
50 %
60 %
70 %
The minimum thickness of plates in a steel stack should be
4 mm
5 mm
6 mm
8 mm
The main advantage of a steel member, is:
Its high strength
Its gas and water tightness
Its long service life
All the above
2.Compression members composed of two channels back-to-back and separated by a small distance are connected together by riveting so that the minimum slenderness ratio of each member between the connections, does not exceed
40
50
60
70
Minimum pitch provided in riveted steel tanks is
1.5 d
2.0 d
2.5 d
3.0 d Where d is diameter of rivets
If the depth of two column sections is equal, then the column splice is provided
With filler plates
With bearing plates
With filler and hearing plates
None of these
In the virtual work method, the virtual quantity is
Displacement
Load
Slope
Moment
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
2
4
6
8