The beams supporting the steps of a stair are generally known as
Headers
Trimmers
Stringers
Spandrel beams
Correct Answer :
C. Stringers
Related Questions
The channels get twisted symmetrically with regard to its axis
Parallel to flanges
Parallel to web
Perpendicular to flanges
Perpendicular to web
The ratio of shearing stress to shearing strain within elastic limit, is known as
Modulus of elasticity
Shear modulus of elasticity
Bulk modulus of elasticity
Tangent modulus of elasticity
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
The allowable tensile stress in structural mild steel plates for steel tank is assumed as
95.0 MPa on net area
105.5 MPa on net area
105.5 MPa on gross area
150.0 MPa on gross area
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
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 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
Water pressure in a 80 cm water main is 10 kg/cm2. The minimum thickness of the metal required for the water main, not to be stressed more than 200 kg/cm2, is
1 cm
1.5 cm
2 cm
2.5 cm
Shear buckling of web in a plate girder is prevented by using
Vertical intermediate stiffener
Horizontal stiffener at neutral axis
Bearing stiffener
None of the above
On steel structures the dead load is the weight of
Steel work
Material fastened to steel work
Material supported permanently
All the above
The cross-section of a standard fillet is a triangle whose base angles are
45° and 45°
30° and 60°
40° and 50°
20° and 70°
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
Study the following statements. (i) Top lateral bracing prevents the sides-way buckling of the chord. (ii) Sway bracing keeps the rectangular shape of the bridge crosssection. (iii) Sway bracing transfers the load from top of end posts to bearings. The correct answer is
Only (i)
Both (i) and (ii)
Both (i) and (iii)
All (i), (ii) and (iii)
The tensile strength of mild steel for bolts and nuts should not be less than
32 kg/mm2
36 kg/mm2
40 kg/mm2
44 kg/mm2
In case of plastic design, the calculated maximum shear capacity of a beam as per IS: 800 shall be
0.55 Aw.fy
0.65 Aw.fy
0.75 Aw.fy
0.85 Aw.fy Where, Aw = effective cross-sectional area resisting shear fy = yield stress of the steel
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
Compression force in two end posts, the pin of a rocker bearing in a bridge is designed for
Bearing and shear
Bending and shear
Bearing and bending
Bearing, shear and bending
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
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 gross section of the web of a beam is defined as
Depth of the beam multiplied by its web thickness
Width of the flange multiplied by its web thickness
Sum of the flange width and depth of the beam multiplied by the web thickness
None of these
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
For eccentrically loaded columns, the bending factor is
Cross-sectional area of column/Radius of gyration
Radius of gyration/Cross-sectional area of column
Cross-sectional area of column/Section modulus of the section
Section modulus of the section/Cross-sectional area of column
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
The maximum axial load which is just sufficient to keep a column in a small deflected shape, is called
Crippling load
Buckling load
Critical load
All 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
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
If the thickness of plate to be connected by a rivet is 16 mm, then suitable size of rivet as per Unwin's formula will be
16 mm
20 mm
24 mm
27 mm
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 maximum slenderness ratio of a compression member carrying both dead and superimposed load is
180
200
250
350