The ratio of the span L of the filler joists to the depth d from the underside of the joist to the top of the structural concrete, should not exceed
60
45
35
25
Correct Answer :
C. 35
Related Questions
If the thickness of a structural member is small as compared to its length and width, it is classified as
One dimensional
Two dimensional
Three dimensional
None of these
According to IS : 800 - 71, the minimum thickness of a vertically stiffened web plate, shall not be less than
d/85
d/200
d/225
d/250
An axial loaded column is supported on a slab base whose projection is 8 cm. If the intensity of pressure from concrete is 40 kg/cm2 and allowable bending stress in slab base is 1890 kg/cm2, the thickness (t) of the slab base, is
t = √(21/64)
t = √(64/21)
t = 21/64
t = 64/21
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
A major beam in a building structure, is known as
A girder
A floor beam
A main beam
All the above
The mechanism method of plastic analysis satisfies
Equilibrium and mechanism conditions
Equilibrium and plastic moment conditions
Mechanism and plastic moment conditions
Equilibrium condition only
For a single section used as a tension member, the given area is assumed
20% to 30% in excess of the net area
30% to 40% in excess of the net area
40% to 50% in excess of the net area
50% to 60% in excess of the net area
Working shear stress on the gross area of a rivet as recommended by Indian Standards, is
785 kg/cm2
1025 kg/cm2
2360 kg/cm2
None of these
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
Column footing is provided
To spread the column load over a larger area
To ensure that intensity of bearing pressure between the column footing and soil does not exceed permissible bearing capacity of the soil
To distribute the column load over soil through the column footing
All the above
As compared to field rivets, the shop rivets are
Stronger
Weaker
Equally strong
Any of the above
Cold driven rivets range from
6 to 10 mm in diameter
10 to 16 mm in diameter
12 to 22 mm in diameter
22 to 32 mm in diameter
If the area of cross-section of a single angle discontinuous strut is 30 cm2 and allowable working stress corresponding to its slenderness ratio is 625 kg/cm2, the safe load carrying capacity of the member, is
10 tonnes
12 tonnes
15 tonnes
18 tonnes
Pick up the correct statement from the following:
The slenderness ratio of lacing bars for compression members should not exceed 145
The minimum width of lacing bar connected with rivets of nominal diameter 16 mm, is kept 50 mm
The minimum thickness of a flat lacing bar is kept equal to onefortieth of its length between inner end rivets
All the above
The internal pressure coefficient on walls for buildings with large permeability is taken as
± 0.2
±0.5
± 0.7
0
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 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 least dimension in case of a circular column of diameter D is taken as
0.5 D
0.68 D
0.88 D
D
Bolts are most suitable to carry
Shear
Bending
Axial tension
Shear and bending
The number of seismic zones in which the country has been divided is
3
5
6
7
In the cross-section of a weld, throat is the
Minimum dimension
Average dimension
Maximum dimension
None of the above
Minimum pitch of the rivets shall not be less than
1.5 d
2.0 d
2.5 d
3.0 d Where d is gross diameter of rivet
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
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
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)
An imaginary line along which rivets are placed, is known as
Rivet line
Back line
Gauge line
All the above
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 correct statement from the following:
The steel beams placed in plain cement concrete, are known as reinforced beams
The filler joists are generally continuous over three-supports only
Continuous fillers are connected to main beams by means of cleat angles
Continuous fillers are supported by main steel beams
The critical load for a column of length I hinged at both ends and having flexural rigidity El, is given by
Pc = π²EI/l²
Pc = πEI/l²
Pc = πEI/I²
None of these
Bending compressive and tensile stresses respectively are calculated based on
Net area and gross area
Gross area and net area
Net area in both cases
Gross area in both cases