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.
Perforated cover plates are particularly suitable for built up sections consisting of
-
channels placed back to back -
channels placed toe to toe -
four angle box section -
all the above.
The main advantage of a steel member, is :
-
its high strength -
its gas and water tightness -
its long service life -
all the above.
The distance between the outer faces of flanges of a plate girder, is known as
-
overall depth -
clear depth -
effective depth -
none of these.
IS :-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.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 -
3.0 mm thickness of packing.
Pick up the correct statement from the following:
-
Loaded columns are supported on column bases -
Column bases transmit the column load to the concrete foundation -
Column load is spread over a large area on concrete -
In column bases, intensity of pressure on concrete block is assumed to be uniform -
All the above.
According to the Unwin's formula, if t is thickness of the plate in cm, the nominal diameter of the rivet, is
-
d = 1.91 t -
d = 1.91 t2 -
d = 1.91 t -
d = 1.91 t -
d = 2.3 t
The distance between the outer faces of flanges of a plate girder, is known as
-
overall depth -
clear depth -
effective depth -
none of these.
Pick up the correct statement from the following:
-
Tacking rivets are used if the minimum distance between centres of two adjacent rivets exceeds 12 t or 200 mm, whichever is less -
Tacking rivets are not considered to calculate stress -
Tacking rivets are provided throughout the length of a compression member composed of two components back to back -
All the above.
If the area of cross-section of a single angle discontinuous strut iscm2 and allowable working stress corresponding to its slenderness ratio iskg/cm2, the safe load carrying capacity of the member, is
-
10 tonnes -
12 tonnes -
15 tonnes -
18 tonnes -
20 tonnes
The distance between the outer faces of flanges of a plate girder, is known as
-
overall depth -
clear depth -
effective depth -
none of these.
The main assumption of the method of simple design of steel frame work, is :
-
beams are simply supported -
all connections of beams, girders and trusses are virtually flexible -
members in compression are subjected to forces applied at appropriate eccentricities -
all the above.
If M is the moment due to a couple in a bearing plate whose width is b and allowable bending stress is P, the thickness (t) of the bending plate of the column splice, is
If the area of cross-section of a single angle discontinuous strut iscm2 and allowable working stress corresponding to its slenderness ratio iskg/cm2, the safe load carrying capacity of the member, is
-
10 tonnes -
12 tonnes -
15 tonnes -
18 tonnes -
20 tonnes
In double lacing, the thickness t of flat lacing is
-
t < 1/40 th length between inner end rivets -
t < 1/50 th length between inner end rivets -
t < 1/60 th length between inner end rivets -
t < 1/70 th length between inner end rivets -
none of these.
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 is uniform between the contact surfaces of the plate and the rivet -
Bearing stress in the rivet is neglected -
All the above.
The main assumption of the method of simple design of steel frame work, is :
-
beams are simply supported -
all connections of beams, girders and trusses are virtually flexible -
members in compression are subjected to forces applied at appropriate eccentricities -
all the above.
The least permissible clear dimension of the web of thickness t in the panel of a plate girder, is restricted to
-
150 t -
160 t -
170 t -
180 t -
200 t
The strength of ISA=xmm used as a tie member with its longer leg connected at the ends bymm diameter rivets, is
-
26,000 kg -
26,025 kg -
26,050 kg -
26,075 kg -
27,000 kg
When the ratio of the moment M to axial load P is greater than
, the resultant of the compressive bearing pressure which acts at a distance Y from one side, is given by
If P is the allowable bending stress in a slab, whose greater and lesser projections from the column faces, are A and B, the thickness (t) of the slab base, is (where w is the intensity of earth pressure.)
When the depth of a plate girder is at least n times the depth of vertical leg of the flange angles, the girder is known as deep plate girder, if n is
-
2 -
4 -
6 -
8 -
10
In a grillage footing, the maximum shear force occurs at the
-
edge of grillage beam -
edge of base plate -
centre of grillage beam -
centre of base plate.
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.
In factory buildings, the horizontal beams spanning between the wall columns supporting a wall covering, are called
-
stringers -
trimmers -
girts -
lintels.
The effective length L of a simply supported beam with ends restrained against torsion, and also the ends of compression flange partially restrained against lateral bending, is given by
-
L = span -
L = 0.85 span -
L = 0.75 span -
L = 0.7 span -
L = 1.25 span
Diameter of a rivet hole is made larger than the diameter of the rivet by
-
1.0 mm for rivet diameter upto 12 mm -
1.5 mm for rivet diameter exceeding 25 mm -
2.0 mm for rivet diameter over 25 mm -
none of these.
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 -
none of these.
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.
A beam may be designed as a cased beam if
-
section is of double open channel form with the webs not less than 40 mm apart -
overall depth and width of the steel section do not exceed 750 and 450 mm respectively. -
beam is solidly encased in concrete with 10 mm aggregate having 28 days strength 160 kg/cm2 -
width of the solid casing is kept at least 100 mm more than the width of the steel flange and having a concrete cover of 50 mm -
all the above.