Civil Engineering - Steel Structure
Exam Duration: 45 Mins Total Questions : 30
A water tank is made with a 8 mm thick plates The plates are joined by single bolted lap joint using 16 mm diameter black bolts of grade 4.6 at a pitch of 50 mm.The efficiency of the joint would be
(Take \(\Upsilon _{ mb }=1.25,f_{ n }\) =410 MPa)
- (a)
20.64%
- (b)
39.54%
- (c)
48.82%
- (d)
64.12%
For the connection shown in the figure the bolt value will be
(Take diameter of bolt as 20 mm and grade 4.6)
- (a)
35.7 KN
- (b)
70.25 kN
- (c)
135.7 kN
- (d)
109.322 kN
Two steel plates each of 10 mm thickness are connected by double cover butt joints by bolts as shown in figure If the bolt diameter is 20 mm and steel is of grade fr 410 Which one of the following section is the most critical section for the main plate?
- (a)
Section 1-1
- (b)
Section 2-2
- (c)
Section 3-3
- (d)
Both section 1-1 and section 3-3
The maximum factored load that can be applied at the joint for the figure shown below will be
(Take \(f_{ u }=410\quad MPa)\)
- (a)
159.11 kN
- (b)
132.55 KN
- (c)
265.12 KN
- (d)
318.14 KN
Which one of the following four shapes for a compound column of the same effective length formed with two equal angles has the highest axial compression load carrying capacity
- (a)
- (b)
- (c)
- (d)
A double angle tension member 2 L 75x50x8 mm connected to gusset plate as shown in figure with one line 16 mm bolts diameter through long leg.The effective net area of section will be
- (a)
424 \(mm^{ 2 }\)
- (b)
368 \(mm^{ 2 }\)
- (c)
792 \(mm^{ 2 }\)
- (d)
1109 \(mm^{ 2 }\)
A single-angle tie of a welded steel truss in an industrial shed is required to be designed for axial tension of 100 kN If ultimate strength of material is 410 MPa,then most suitable section satisfying is : 800-2007 codal requirements will be
Section | \(A_{ 1 }(mm^{ 2 })\) | \(A_{ 2 }(mm^{ 2 })\) | \(A_{ ne }(mm^{ 2 })\) |
ISA 75X50X6 | 432 | 282 | 570.4 |
ISA 60X40X5 | 287.5 | 187.5 | 380 |
ISA 50X30X4 | 192 | 112 | 243.2 |
ISA 45X30X5 | 212.5 | 137.5 | 280 |
- (a)
ISA 75X50X6
- (b)
ISA 60X40X5
- (c)
ISA 50X30X4
- (d)
ISA 45X30X5
Two identical I-section form a compound column section.For most economical section distance between web of I-section will be
Where \(r_{ xx }\) =radius of gyration of single I-section about xx-axis \(r_{ yy }\)=radius of gyration of single I-section about yy-axis
- (a)
\(r_{ xx }+\gamma _{ yy }\)
- (b)
\(2(f_{ xx }+f_{ yy })\)
- (c)
\(2\sqrt { r^{ 2 }_{ xx }-r^{ 2 }_{ yy } } \)
- (d)
\(2f_{ xx }\)
A simply supported beam of 8 m effective span carries a uniformly distributed factored load of 3 KN/m over the effective span If the steel is of grade Fe 410 then the must suitable trial steel shape and size would be a
- (a)
Solid circular section of diameter=110 mm,Area=\(9500mm^{ 2 }\)
Section module=130660 \(mm^{ 2 }\) - (b)
Solid rectangular section of size 60 mm=100 mm deep,Area=6000 \(mm^{ 2 }\) maximum section modules=100000 \(mm^{ 3 }\)
- (c)
T-section of size 200 mmX200mmX1mm thickness Area=3900 \(mm^{ 2 }\) maximum section modules=105780 \(mm^{ 3 }\)
- (d)
I-section of size 80 mmX150 mm deepX10mm thickness Area=2900 \(mm^{ 2 }\) Maximum section modules=129100 \(mm^{ 3 }\)
The shape factor of the section shown in figure below is
- (a)
\(\frac { 139 }{ 82 } \)
- (b)
\(\frac { 145 }{ 86 } \)
- (c)
\(\frac { 150 }{ 91 } \)
- (d)
\(\frac { 160 }{ 97 } \)
For fixed beam as shown in figure The collapse load \(W_{ u }\) is
- (a)
\(\frac { 6M_{ p } }{ l } \)
- (b)
\(\frac { 8M_{ p } }{ l } \)
- (c)
\(\frac { 12M_{ p } }{ l } \)
- (d)
\(\frac { 14.5M_{ p } }{ l } \)
For the fixed beam as shown in figure the collapse load is
- (a)
\(\frac { 8M_{ p } }{ l^{ 2 } } \)
- (b)
\(\frac { 12M_{ p } }{ l^{ 2 } } \)
- (c)
\(\frac { 16M_{ p } }{ l^{ 2 } } \)
- (d)
\(\frac { 20M_{ p } }{ l^{ 2 } } \)
A rectangular steel section of width h has been stressed up to yield point of \(f_{ y }\) up to a depth of from both the top and bottom face under the action of moment M is
- (a)
\(\frac { 10 }{ 24 } bh^{ 2 }f_{ y }\)
- (b)
\(\frac { 1 }{ 4 } bh^{ 2 }f_{ y }\)
- (c)
\(\frac { 11 }{ 48 } bh^{ 2 }f_{ y }\)
- (d)
\(\frac { 13 }{ 36 } bh^{ 2 }f_{ y }\)
In a plastic hings the actual distribution of strains across the section will be as in
- (a)
- (b)
- (c)
- (d)
An 400 ISF 10 mm of grade Fe 410 is used as a tension member in a lattice grider.It is connected to a 12 mm thick gusset plate by 18 mm diameter bolts of grade 4.6.
(i) What is the effective net area if chain bolting is done, as shown in the figure?
- (a)
400 mm2
- (b)
3400 mm2
- (c)
3200 mm2
- (d)
3946 mm2
Is the theory of plastic bending of beams, the ratio of plastic moment to yield moment is called
- (a)
shape factor
- (b)
plastic section modulus
- (c)
modulus of resistance
- (d)
rigidity module
The square root of the ratio of moment of inertia of the cross-section to its cross-sectional area is called
- (a)
second moment of area
- (b)
slenderness ratio
- (c)
section modulus
- (d)
radius of gyration
In a plate girder,the web plate is connected to the flange plates by fillet welding.The size of fillet weld is designed to safely resist.
- (a)
The bending stress in the flanges
- (b)
The horizontal shear force between the flanges and the web plate
- (c)
The vertical shear force at the section
- (d)
The force causing buckling in the web
In section shear centre is a point through which if the resultant load pressure the section will not be subjected to any
- (a)
bending
- (b)
tension
- (c)
compression
- (d)
twistling
Which one of the bolts is a web splice of a plate grider as shown in the figure is stressed maximum?
- (a)
bolt-1
- (b)
bolt-2
- (c)
bolt-3
- (d)
bolt-4
A 12 mm thick plate is connected to two 8 mm thick plates on either side through a 16 mm diameter black bolt as shown in the figure (grade of bolt is 4.6) The bolt value of the joint is (assume \(K_{ b }=1)\)
- (a)
153.6 KN
- (b)
86.8 KN
- (c)
74.3 KN
- (d)
45.6 KN
A steel flat of rectangular section of size 70X6 mm is connected to a gusset bolts each having a shear capacity of 25 KN in holes having diameter 11.55 mm.if the grade of bolt is 4.6, the maximum tension that can be applied to the flat is
- (a)
103.6 KN
- (b)
75.0 KN
- (c)
45.0 KN
- (d)
42.6 KN
A moment M of magnitude of 150 KN-m is transmitted to a column flange through a bracket using four 20 mm diameter bolts as shown in figure
The shear force included in the bolt A is
- (a)
530.3 KN
- (b)
265.2 KN
- (c)
176.7 KN
- (d)
158.2 KN
A square steel slab base of area 1 \(m^{ 2 }\) is provided for a column made of two rolled channel section.The 300 mmX300 mm column carries an axial compressive load of 2000 kN The line of action of the load passes through the centroid of column section as well as slab base.The yield stress in the slab base.The yield stress in the slab base 250 MPa.The required minimum thickness of the slab base as per IS: 800-2007 is
- (a)
54.5 mm
- (b)
41.4 mm
- (c)
37.6 mm
- (d)
24.88 mm
Two plates of thickness 10 mm and 12 mm (steel is of grade Fe-410) are lap jointed with the bolts of diameter 20 mm and of grade 4.6 as shown in figure
Strength of bolt in bearing per pitch length can be given as (assume \(\gamma _{ mb }=1.25,K_{ b }=0.5\))
- (a)
160 KN
- (b)
230.25 KN
- (c)
80 KN
- (d)
295.2 KN
Two plates of thickness 10 mm and 12 mm (steel is of grade Fe-410) are lap jointed with the bolts of diameter 20 mm and of grade 4.6 as shown in figure
If the strength of joint per pitch length is 90 KN the efficiency of the joint can be given by
- (a)
78.50 %
- (b)
66.66%
- (c)
58.46%
- (d)
30.48%
A tie member 90 mmX8 mm is to transmit a factored load of 150 KN The steel used is of grade Fe 410.Assume gusset plate to 12 mm thick
(i) If welding is done along longitudinal direction of member.The necessary overlap will be (asssume \(\gamma _{ mw }=125)\) and size of weld=6 mm)
- (a)
76.62 mm
- (b)
93.36 mm
- (c)
140.52 mm
- (d)
186.82 mm
propped cantilever beam is subjected to collapse that of 18 KN as shown in the figure
If the yield stress \(f_{ y }\) =250 MPa) The plastic section modulus is given as
- (a)
192X\(10^{ 3 }mm^{ 3 }\)
- (b)
108X\(10^{ 3 }mm^{ 3 }\)
- (c)
96X\(10^{ 3 }mm^{ 3 }\)
- (d)
108 \(10^{ 3 }mm^{ 3 }\)
A circular pipe (penstock) of mild steel 1.5 m in diameter is field welded with 10 mm thick plates The plates are secured by 6 mm fillet welded,provided on the inside and the outside ends as shown in the figure.
What will be the safe internal pressure that can be allowed in the pipe?(Factor of safety =1.5)
- (a)
3.18 N/\(mm^{ 2 }\)
- (b)
2.12 N/\(mm^{ 2 }\)
- (c)
1.41 N/\(mm^{ 2 }\)
- (d)
1.22 N/\(mm^{ 2 }\)
For block shear failure of a tension member the failure occurs along a path through connection involving
- (a)
tension on the two perpendicular planes
- (b)
shear on the two perpendicular planes
- (c)
tension on one plane and shear on the other perpendicular plane
- (d)
tension on one plane and compression on the other perpendicular plane.