PTU Punjab Technical University B-Tech May 2019 Question Papers 5th Semester Civil Engineering (CIV)
Total No. of Pages : 03
Total No. of Questions : 09
B.Tech.(CE) (2011 Onwards) (Sem.?5)
DESIGN OF STEEL STRUCTURES?I
Subject Code : BTCE-501
M.Code : 70512
Time : 3 Hrs. Max. Marks : 60
INSTRUCTION TO CANDIDATES :
1.
SECTION-A is COMPULSORY consisting of TEN questions carrying T WO marks
each.
2.
SECTION-B contains FIVE questions carrying FIVE marks each and students
have to attempt any FOUR questions.
3.
SECTION-C contains T HREE questions carrying T EN marks each and students
have to attempt any T WO questions.
SECTION-A
Q.1 Answer briefly :
(a) Why is steel considered superior for structural applications compared to the cast iron
and wrought iron?
(b) State the advantages of using wide flange beams over narrow ISMB beams.
(c) What are the advantages of bolted connections over riveted or welded connections?
(d) What is a pin connection? List some of the pinned connection used in steel structures?
(e) State the possible failure modes of an axially loaded column. Why is it better to choose
plastic or compact sections for columns?
(f) What is difference between lacing and battens?
(g) What is difference between laterally restrained and un-restrained sections?
(h) What are the types of base plates used in practice?
(i) What are various types of groove welds? What is difference between groove weld and
fillet weld?
(j) What are the different types of bracings used in a braced building?
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SECTION-B
Q.2 The plates of a tank 8 mm thick are connected by a single bolted lap joint with 20 mm
diameter bolts at 50 mm pitch. Calculate the efficiency of the joint. Assume Fe 410 plate
and grade 4.6 bolts.
Q3. A single unequal angle 100 ? 75 ? 6 mm is connected to a 10 mm thick gusset plate at the
ends with six 16 mm diameter bolts to transfer tension. Determine the design tensile
strength of the angle assuming that the yield and the ultimate stress of steel used are 250
MPa and 410 MPa if gusset plate is connected to the 75 mm leg. Take g = 40mm.
10 mm
40
40
5?40
ISA 100 ? 75 ?6
T
(A=1010mm2)
g
16 b
olt
Fig.
Q4. The strut of a space frame member having a length of 3.5 m has to carry a factored load of
300 kN. Assuming yield stress of steel 250 Mpa. design a circular tube to carry the load.
Assume that ends are simply supported.
Q5. Design a base plate for an ISHB 200 column to carry a factored load of 600 kN. Assuming
Fe 410 grade of steel and M25 concrete. Use the effective area method of design.
Q6. A tie member used as a diagonal in a roof truss consists of two angles 75 ? 50 ? 8 mm
(fy = 280 MPa) placed back to back on the each side of gusset plate. The rivets of 18 mm
diameter are provided in one row and the angles are tack riveted. Determine the tensile
strength of the member.
SECTION-C
Q7. What are the advantages and drawbacks of the following :
(a) Aluminium decking
(b) GI sheeting
(c) Asbestos sheeting
(d) Ferrocement sheeting
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Q8. A flat roof building of 18 m span has 1.5 m deep trusses at 5 m centres. The total dead load
is 0.7 kN/m2 and the imposed load is 0.75 kN/m2. Design the truss using angle sections
with welded internal joints and bolted field splices.
Q9. Design a beam of effective span 5 m and subjected to a bending moment of 187.5 kNm
carrying a reinforced concrete floor capable of providing lateral restraint to the top
compression flange. The uniformly distributed load is made up of 20 kN/m imposed load
and 20 kN/m dead load and section is stiff against bearing. Assume Fe 410 grade steel.
NOTE : Disclosure of Identity by writing Mobile No. or Making of passing request on any
page of Answer Sheet will lead to UMC against the Student.
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This post was last modified on 04 November 2019