Steel Structure
Exam Duration: 45 Mins Total Questions : 30
A bracket Plate 12 mm thick is used to transmit a factored load of 100 KN at an eccentricity as shown in figure (Take \(\Upsilon _{ mw }=1.25\) and \(f_{ u }\) =410 MPa
- (a)
3.39 mm
- (b)
5.00 mm
- (c)
7.0 mm
- (d)
9.50 mm
A structured member is connected to a gusset plate by a lap joint by the five bolts of grade 4.6 and of diameter 20 mm. The member has to transmit a pull of 200 kN and a clockwise moment of 50 KN-m The greatest shear produced in any bolt due to moment will be
- (a)
50 KN
- (b)
150 KN
- (c)
125 KN
- (d)
175 KN
A bracket is fillet welded to a column as shown in figures The maximim resistance offered by weld per mm length would be
use \(l_{ zz }=4x10^{ 6 }\quad mm^{ 4 }/mm\)
- (a)
150.0 N/mm
- (b)
441.6 N/mm
- (c)
516.5 N/mm
- (d)
541.6 N/mm
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)
For connecting lacing flats to column sections with 20 mm diameter bolt, the minimum width of flat should be
- (a)
36 mm
- (b)
54 mm
- (c)
60 mm
- (d)
70 mm
The most efficient section for a given beam for a given cross-sectional area is
- (a)
Circular
- (b)
hollow circular
- (c)
channel
- (d)
i-section
For rolled steel sections recommended for beams the depth to thickness ratio of web is less than
- (a)
50
- (b)
85
- (c)
145
- (d)
180
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
A steel plate is 40 cm wide and 10 mm thick If the diameter of bolt hole is 22 mm, the net section area of the plate is
- (a)
40.00 \(cm^{ 2 }\)
- (b)
38.80 \(cm^{ 2 }\)
- (c)
38.00 \(cm^{ 2 }\)
- (d)
37.80 \(cm^{ 2 }\)
What is the effective net width of plate shown in figure for carrying tension?
- (a)
225 mm
- (b)
237.5 mm
- (c)
256.25 mm
- (d)
275 mm
The net area of the flat as shown in figure to be considered in design will be along the section
- (a)
1-2-3-4
- (b)
1-2-6-3-4
- (c)
5-6-7
- (d)
1-2-6-7
A steel rod of 16 mm diameter has been used as tie member in roof bracing system ,but many be subjected to possible reversal of stress due to wind.What is the maximum permitted length of the member?
- (a)
1600 mm
- (b)
1440 mm
- (c)
1400 mm
- (d)
2800 mm
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 cantilevered beam of 4m effective span carries a uniformly factored distributed load of 25 kN/m inclusive of self weight The beam comprises ISLB 300 (a) 210 N/mm flange 120 mmX8 mm ,web thickness 6.0 mm, \(I_{ xx }=1712.6\quad cm^{ 4 },I_{ yy }=121.4\quad cm^{ 4 }\) bending stress in the beam is
- (a)
1816.6 N/\(mm^{ 2 }\)
- (b)
1782.7 \(mm^{ 2 }\)
- (c)
1284.6 N/\(mm^{ 2 }\)
- (d)
12.84N/ \(mm^{ 2 }\)
A column base is subjected to moment if the intensity of bearing pressure due to axial load to stress due to moment then the bearing pressure between the base and the concrete is
- (a)
Uniform compression throughout
- (b)
Zero at one end and compression at other end
- (c)
tension at one one end compression at other end
- (d)
uniform tension throughout
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)
\(\frac { 20M_{ p } }{ l^{ 2 } } \)
If yy is the centralised axis of a T-beam section subjected to plastic moment \(M_{ P }\) the neutral axis lies
- (a)
above ZZ
- (b)
between YY and ZZ
- (c)
between XX and YY
- (d)
below XX
A Portal frame subjected to loading as shown in figure likely positions where the plastic hinges can form in combined mechanism would include.
- (a)
2,3,5
- (b)
4,5
- (c)
1,4,5
- (d)
3,5
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)
\(\frac { 13 }{ 36 } bh^{ 2 }f_{ y }\)
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
At the location of a plastic hings
- (a)
radius of curvature is infinite
- (b)
curvature is infinite
- (c)
moment is infinite
- (d)
flexible stress is infinite
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 bracket connection is made with four bolts of 10 mm diameter and supports a load of 10 KN at an eccentricity of 100 mm.The maximum force to be resisted by any bolt will be (all distance are in mm)
- (a)
5 KN
- (b)
6.5 KN
- (c)
6.8 KN
- (d)
7.16 KN
A struct in a steel truss is composed of two equals angles ISA 150 MM x150 MM of thickness 10 mm connected back to back to the same side of gusset plate.The cross sectional area of each angle is 2921 mm.and moment of inertia \((I_{ XX= }I_{ YY })\) is 6335000 mm.The distance of the centroid of the angle from its surface of the centroid of the angle from its surface \((C_{ x }=C_{ y })\) is 40.8 mm.The minimum radius of gyration of the strut is
- (a)
93.2 mm
- (b)
62.7 mm
- (c)
46.6 mm
- (d)
29.8 mm
Match List I (Shape of structure ) with List II (Shape factor) and select the correct answer using the codes given below the lists
List I | List II |
P.Rectangular | 2.0 |
QCircular | 2.1.1 to 1.2 |
R.I-section | 3.1.5 |
S.Diamond | 4 1.7 |
- (a)
P Q R S 3 1 3 1 - (b)
P Q R S 2 4 3 1 - (c)
P Q R S 3 4 2 1 - (d)
P Q R S 2 1 3 4
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 in a truss girder of 250 mmX14 mm in size is welded to a 10 mm thick gusset plate by a fillet weld.The overlap of the member is 300 mm and the weld size is 6 mm.Welding is done as shown in the figure.
The design strength of the weld will be (assume shop welding and grade of steel Fe-410 MPa)
- (a)
198.84 KN
- (b)
676.05 KN
- (c)
874.89 KN
- (d)
892.72 KN