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
Correct Answer :
D. 270 t
Related Questions
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
The connection of one beam to another beam by means of an angle at the bottom and an angle at the top, is known as
Unstiffened seated connection
Stiffened seated connection
Seated connection
None of these
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
As per IS : 875, for the purposes of specifying basic wind velocity, the country has been divided into
4 zones
5 zones
6 zones
7 zones
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
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
Intermediate vertical stiffeners in a plate girder need be provided if the depth of web exceeds
50 t
85 t
200 t
250 t Where t is thickness of web
Hudson's formula gives the dead weight of a truss bridge as a function of
Bottom chord area
Top chord area
Effective span of bridge
Heaviest axle load of engine
A major beam in a building structure, is known as
A girder
A floor beam
A main beam
All the above
An imaginary line along which rivets are placed, is known as
Rivet line
Back line
Gauge line
All the above
The minimum thickness of plates in a steel stack should be
4 mm
5 mm
6 mm
8 mm
The minimum edge distance of a rivet line connecting two or more plates, is kept equal to 37 mm plus (where t is the thickness in mm of the thinner outside plate).
2 t
4 t
6 t
8 t
If W and L are the total superimposed load and the span of a plate girder in metres, the approximate self weight (W) of the girder, is taken as
M = WL/100
M = WL/200
M = WL/300
M = WL/400
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
If the floor is supported at or near the bottom but top chords of a bridge is not braced, then the bridge is called
Deck type
Through type
Half through type
Double deck type
If the pitch is 6 cm and rivet value is 4 tonnes, the number of rivets required for a riveted connection carrying an eccentric load of 15 tonnes at a distance of 30 cm from the centre line, is
6
8
10
15
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
If N is the number of rivets in the joint, the strength of a riveted joint against shearing of rivets, is given by
Ps = N × (π/4) d2 × Ps
Ps = N × (d × t × ps)
Ps = N × (p - d) × t × Ps
Ps = N × (P + d) × t × ps
A circular column section is generally not used in actual practice because
It is uneconomical
It cannot carry the load safely
It is difficult to connect beams to the round sections
All of the above
When a tension member is made of four angles with a plate as a web, the allowance for holes is made as
Two holes for each angle and one hole for the web
One hole for each angle and one hole for the web
One hole for each angle and two holes for the web
Two holes for each angle and two holes for the web
The greatest gauge of long rivets should not exceed (where d is the diameter of the holes).
2 d
4 d
6 d
8 d
The economical depth d of a web plate in which allowable bearing stress is fb, and the maximum bending moment is M, as suggested by Rawater and Clark, is
d = (M/fb)
d = 1.5 (M/fb)
d = 2.5 (M/fb)
d = 4.5 (M/fb)
According to I.S. : 800 - 1871, lacing bars resist transverse shear equal to
1.0% of the axial load
2.0% of the axial load
2.5% of the axial load
3.0% of the axial load
Steel tanks are mainly designed for
Weight of tank
Wind pressure
Water pressure
Earthquake forces
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)}]
A steel beam supporting loads from the floor slab as well as from wall is termed as
Stringer beam
Lintel beam
Spandrel beam
Header beam
A butt weld is specified by
Effective throat thickness
Plate thickness
Size of weld
Penetration thickness
A single angle in tension is connected by one leg only. If the areas of connecting and outstanding legs are respectively a and b, net effective area of the angle, 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)}]
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
The most commonly used sections in lateral system to carry shear force in built up columns, are
Rolled steel flats
Rolled angles
Rolled channels
All the above