Effective length of a column effectively held in position at both ends and restrained in direction at one end, is
L
0.67 L
0.85 L
1.5 L
Correct Answer :
C. 0.85 L
Related Questions
When the bolts are subjected to reversal of stresses, the most suitable type of bolt is
Black bolt
Ordinary unfinished bolt
Turned and fitted bolt
High strength bolt
Design of a riveted joint, is based on the assumption:
Load is uniformly distributed among all the rivets
Shear stress on a rivet is uniformly distributed over its gross area
Bearing stress in the rivet is neglected
All the above
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
When a tension member consists of two channel sections, the allowance for rivet hole is made for two holes from
Each web
Each flange
Each web or one hole from each flange whichever is more
Each web or one hole from each flange whichever is less
For a steel grillage footing to support two unequal column loads
Line of action of the resultant of two column loads, is made to coincide with the centre of gravity of the base of the footing
Trapezoidal shape is used for the base footing
Projections of beams on either side in lower tier are such that bending moments under columns are equal
All the above
The central deflection of a simply supported steel beam of length L with a concentrated load W at the centre, is
WL3/3EI
WL4/3EI
WL3/48EI
5WL4/384EI
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 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
The bracing provided in the plane of end posts is called
Sway bracing
Portal bracing
Top lateral bracing
Bottom lateral bracing
Tacking rivets in compression plates not exposed to the weather, have a pitch not exceeding 300 mm or
16 times the thickness of outside plate
24 times the thickness of outside plate
32 times the thickness of outside plate
36 times the thickness of outside plate
The critical stress on a column for elastic buckling given by Euler's formula, is
fc = π²E/(I/r)²
fc = (I/r)²/ πE
fc = (I/r)/ πE
fc = π²E/(I/r)
Minimum spacing of vertical stiffeners is limited to
d/4
d/3
d/2
2d/3 Where d is the distance between flange angles
The Indian standard code which deals with steel structures, is
IS : 875
IS : 800
IS : 456
IS : 1893
Select the correct statement
Material cost of a rivet is higher than that of a bolt
Tensile strength of a bolt is lesser than that of a rivet
Bolts are used as a temporary fastening whereas rivets are used as permanent fastenings
Riveting is less noisy than bolting
Live load
Varies in magnitude
Varies in position
Is expressed as uniformly distributed load
All the above
The portal bracing in a truss bridge is used to
Transfer load from top of end posts to bearings
Keep the rectangular shape of the bridge cross-section
Stiffen the structure laterally
Prevent the sides-way buckling of top chord
The effective length of a compression member of length L held in position at both ends but not restrained in direction, is
L
0.67 L
0.85 L
1.5 L
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
With usual notations of the letters, the shear stress fs at any point of the cross-section is given by
fs =FQ/It
fs =Ft/IQ
fs =It/FQ
fs =IF/Qt
Maximum permissible slenderness ratio of a member normally acting as a tie in a roof truss, is
180
200
250
350
Assuming the values of maximum deviation ΔP and ΔE to be 25% of the computed value of P and E respectively, the minimum value of the factor of safety is
1.00
0.67
1.67
2.67
The number of seismic zones in which the country has been divided is
3
5
6
7
If L is the overall length of a combined footing having A as its area, d being the distance between the centre of gravity of the base and centre of the base, the larger width b is
(A/L) + (3Ad/L²)
(A/L) + (6Ad/L²)
(A/L) - (6Ad/L²)
(A/L) - (3Ad/L²)
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
For the steel member exposed to weather and accessible for repainting, the thickness of steel should not be less than (accepting the webs of Indian Standard rolled steel joists and channels).
4 mm
6 mm
8 mm
10 mm
A simply supported beam carrying a central load, will be safe in deflection if the ratio of its span to depth, is
< 19
< 24
> 19
> 24
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 minimum width B of a solid casing for a cased beam, is equal to
B = b + 25 mm
B = b + 50 mm
B = b + 75 mm
B = b + 100 mm
When a load is transferred through one surface to another surface in contact, the stress is known as
Tensile stress
Compressive stress
Shearing stress
None of these
Pick up the correct statement from the following:
The minimum pitch should not be less than 2.5 times the gross diameter of the river
The minimum pitch should not be less than 12 times the gross diameter of the rivet
The maximum pitch should not exceed 10 times the thickness or 150 mm whichever is less in compression
All the above