Efficiency of a riveted joint, having the minimum pitch as per IS : 800, is
40 %
50 %
60 %
70 %
Correct Answer :
C. 60 %
Related Questions
For the buildings having a low permeability, the internal wind pressure acting normal to the wall and roof surfaces is taken as
Zero
±0.2 p
± 0.5 p
±0.7 p Where p is basic wind pressure
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 maximum spacing of vertical stiffeners is
1.33 d
1.25 d
1.5 d
1.75 d Where d is the distance between flange angles
The risk coefficient k, depends on
Mean probable design life of structures
Basic wind speed
Both (A) and (B)
None of the above
The most economical section for a column, is
Rectangular
Solid round
Flat strip
Tubular section
To keep the intensity of bearing pressure between the column base and concrete compressive and to vary from zero to 2P/BL, the ratio of the moment M to the axial load P should be
L/2
L/3
L/4
L/6
The overlap of batten plates with the main members in welded connections should be more than
3 t
4 t
6 t
8 t Where t = thickness of the batten plate
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
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 maximum tensile and compressive bending stress in extreme fibres of rolled I-sections and channels on the effective section, is
1500 kg/cm2
1420 kg/cm2
1650 kg/cm2
2285 kg/cm2
Maximum pitch of rivets, used in steel stacks, is limited to
6 t
10 t
12 t
16 t Where t is thickness of thinner plate being connected
If f is the maximum allowable bending stress in a tension member whose radius of gyration is r and depth is 2y, the required cross sectional area A is given by
A = My/fr²
A = My²/fr²
A = My/fr
A = My/f²r²
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)
The strength of ISA 125 = 75 × 10 mm used as a tie member with its longer leg connected at the ends by 27 mm diameter rivets, is
26,000 kg
26,025 kg
26,050 kg
26,075 kg
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
The effective length of a compression member of length L, held in position and restrained in direction at both ends, is
L
0.67 L
0.85 L
1.5 L
A riveted joint may experience
Shear failure
Shear failure of plates
Bearing failure
All the above
If the moment of inertia of a section about its axis is I and its effective sectional area is A, its radius of gyration r about the axis, is
r = I/A
r = √(I/A)
r = (I/A)
r = √(A/I)
If a pair of angles placed back to back in tension are connected by one leg of each angle, the net effective area of the section, is
a - [b/{1 + 0.35 (b/a)}]
a + [b/{1 + 0.35 (b/a)}]
a - [b/{1 + 0.2 (b/a)}]
a + [b/{1 + 0.2 (b/a)}]
Pick up the correct statement from the following:
The ends of a strut, are connected together with two rivets
The members of strut will have at least two connections spaced equidistant in their length
The members when separated back-to-back, the connecting rivets should pass through solid washer or packing
All the above
The minimum thickness of plates in a steel stack should be
4 mm
5 mm
6 mm
8 mm
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 double angles carrying tension, placed back to back and connected to either side of the gusset plate, the sectional area of the section, is equal to cross sectional area of
The section
The section plus area of rivet holes
The section minus area of rivet holes
The section multiplied by the area of the rivet hole
The greatest permissible clear dimension of the web of thickness t in the panel of a plate girder, is restricted to
180 t
220 t
230 t
270 t
A column splice is used to increase
Length of the column
Strength of the column
Cross-sectional area of the column
None of these
The beams supporting the steps of a stair are generally known as
Headers
Trimmers
Stringers
Spandrel beams
The use of tie plates in laced columns is
Prohibited
Not prohibited
Permitted at start and end of lacing system only
Permitted between two parts of the lacing
Pick up the incorrect statement from the following:
The nominal diameter of a rivet is its diameter before driving
The gross diameter of a rivet is the diameter of rivet hole
The gross area of a rivet is the cross-sectional area of the rivet hole
The diameter of a rivet hole is equal to the nominal diameter of the rivet plus 1.5 mm
Rolled steel angle sections are classified as
Equal angles
Unequal angles
Bulb angles
All the above
IS : 800 - 1971 recommends that in a splice plate the number of rivets carrying calculated shear stress through a packing greater than 6 mm thick, is to be increased by 2.5% for every
1.00 mm thickness of packing
1.50 mm thickness of packing
2.0 mm thickness of packing
2.50 mm thickness of packing