Secant formula for direct stress in compression, is applicable only for slenderness ratio upto
120
130
140
150
Correct Answer :
C. 140
Related Questions
A tension member, if subjected to possible reversal of stress due to wind, the slenderness ratio of the member should not exceed
180
200
300
350
The effective length of a weld, is taken as the actual length
Minus the size of weld
Minus twice the size of weld
Plus the size of weld
Plus twice the size of weld
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
Rise of a Jack arch is kept about
1/2 to 1/3 of the span
1/3 to 1/4 of the span
1/4 to 1/8 of the span
1/8 to 1/12 of the span
The central deflection of a simply supported steel beam of length L with a concentrated load W at the centre, is
WL3/3EI
WL4/3EI
WL3/48EI
5WL4/384EI
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
When the length of a tension member is too long
A wire rope is used
A rod is used
A bar is used
A single angle is used
According to the Unwin's formula, if t is thickness of the plate in mm, the nominal diameter of the rivet, is
d = 1.91 t
d = 1.91 t2
d = 1.91 √t
d = 1.91 t
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
The diameter of a bolt hole is taken as the nominal diameter of the bolt plus
1.0 mm
1.2 mm
1.4 mm
1.6 mm
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
When the axis of load lies in the plane of rivet group, then the most heavily loaded rivet will be the one which (Where, Fa is the load shared by each rivet due to axial load and Fm is the shearing load due to moment in any rivet.)
Is at the maximum distance from CG of the rivet group
Is at the minimum distance from CG of the rivet group
Gives the maximum angle between the two forces Fa and Fm
Gives the minimum angle between the two forces Fa and Fm
The risk coefficient k, depends on
Mean probable design life of structures
Basic wind speed
Both (A) and (B)
None of the above
If the depth of the section of an upper column is smaller than the lower column
Filler plates are provided with column splice
Bearing plates are provided with column splice
Filler plates and bearing plates are provided with column splice
None of these
If d is the distance between the flange angles, the vertical stiffeners in plate girders are spaced not greater than
d
1.25 d
1.5 d
1.75 d
Tacking rivets in tension members, are provided at a pitch in line not exceeding
25 cm
50 cm
75 cm
100 cm
Steel tanks are mainly designed for
Weight of tank
Wind pressure
Water pressure
Earthquake forces
The maximum permissible slenderness ratio of a member carrying loads resulting from wind, is
180
200
250
300
Outstanding length of a compression member consisting of a channel, is measured as
Half of the nominal width
Nominal width of the section
From the edge to the first row of rivets
None of these
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
For a rectangular section, the ratio of the maximum and average shear stresses, is
1.5
2.0
2.5
3.5
The moment of the couple set up in a section of a beam by the longitudinal compressive and tensile force, is known as
Bending moment
Moment of resistance
Flexural stress moment
None of these
The distance between e.g. of compression and e.g. of tension flanges of a plate girder, is known as
Overall depth
Clear depth
Effective depth
None of these
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:
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
All the above
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
In a truss girder of a bridge, a diagonal consists of mild steel flat 4001.S.F. and carries a pull of 80 tonnes. If the gross-diameter of the rivet is 26 mm, the number of rivets required in the splice, is
6
7
8
9
When a tension member consists of two channel sections, the allowance for rivet hole is made for two holes from
Each web
Each flange
Each web or one hole from each flange whichever is more
Each web or one hole from each flange whichever is less
Minimum thickness of web in a plate girder, when the plate is accessible and also exposed to weather, is
5 mm
6 mm
8 mm
10 mm
Lug angles
Are used to reduce the length of connection
Are unequal angles
Increases shear lag
All the above