Course Name : Diploma in Architectural Assistantship
Course Code : AA
Semester : Fourth
Subject : Design of Steel Structure
Marks : 100 Time : 3 Hrs.
1. All questions are compulsory.
2. Illustrate your answers with neat sketches wherever necessary.
3. Figures to the right indicate full marks.
3. Assume suitable data if necessary.
4. Preferably, write the answers in sequential order.
Q.1 a) Attempt any FOUR of the following. 08 Marks
a) Sketch any four steel sections.
b) Give designation of any two structural steel sections as per I. S.
c) Write the use of slab base
d) What is mean by gusseted base.
e) Write the I.S. specification for the pitch of rivet.
f) Write the formula for net sectional area of plate connected by staggered (zig-zag) riveting.
Q.1 b) Attempt any THREE of the following. 12 Marks
a) Sketch the triple riveted double cover plate but joint (Elevation & Section)
b) Find the net sectional area of ISA 90 X 60 X 8 mm unequal angle longer leg
c) connected with gusset plate by one rivet of 20 mm. diameter
d) Sketch and label the diagram of gusseted base.
e) Sketch and label the parts of following steel sections with I.S. designations I – Section, Channel Section.
Q.2 Attempt any FOUR of the following. 16 Marks
a) Calculate the strength Per pitch length of plate 12 mm thick used as tie
i) member & connected by means of 22 mm. diameter triple riveted butt joint
ii) ( Pitch of Rivet = 60 mm ) Assume stresses required.
b) Write the procedure to find the strength of riveted joint.
c) Give the advantages & disadvantages of welded joint.
d) Write the I.S. specification for the size of butt weld and fillet weld.
e) Write the use of slab base & Gusseted base.
f) How to transmit the load of column through gusseted base & Give the Forces
created in each part of gusseted base.
Q.3 Attempt any FOUR of the following. 16 Marks
a) Two 10 mm thick plates are joined together by means of double riveted lap Joint. The rivets are 20 mm diameter at a pitch of 75 mm. Find out the way in which the joint will fail. The ultimate tensile stress 450 N/mm2 and ultimate shearing & bearing stresses in rivet being 300 N / mm2 & 600 N /mm2.
b) 16mm thick plates is joint by double cover butt joint using a 10mm thick cover plate. The steel of main and cover plate having permissible tensile strength of 150 N/mm2. Determine the strength of joint per pitch of 9cm. Rivets are power design shop rivets of 20 mm
c) Two plates 10mm thick are joined together means of double riveted double cover butt joint using 20mm diameter rivets. Design pitch of rivets take bat = 150 N/mm2
Q.4 Attempt any TWO of the following. 16 Marks
a) Design a suitable fillet wielded joint between two plates of size 180mm X 8mm and 200mm and 8mm to develop the full strengthen of the smaller plate in tension. Permissible tensile strain Bat = 150 N/mm2
b) Find the strength of un equal weld as shown in fig. 1. When angle section carries axial load of 210 kn and size of weld = 7mm
c) Design a suitable fillet weld to connect a tie bar 80mm x 8mm at its ends. Use a gusset plate 8mm thick take the permissible stress in tension to be 150N/mm2
Q.5 Attempt any TWO of the following. 16 Marks
a) Calculate the strength of ISA 90X60X8mm used as a tie member with its longer leg connected at ends by 16mm diameter rivet.
b) Design an unequal angle section to act as a tie member 1.56m long in a roof truss if it is to carry an axial load of 120kn. Use hand driven rivets at joints.
c) An angle iron ISA 7070X10mm thick is used as a tension member connected to a gusset by 16mm dia rivets through both legs. The rivets are pitched at 50mm on each leg. The rivets on two legs are staggered by 25mm as shown in fig. 2. Find the allowable axial tension in the angle section if the permissible tensile stress is 150 mpa.
Q.6 Attempt any TWO of the following. 16 Marks
a) Design a slab base for 2 column section consisting of one SC 250 with two cover plates 300X25mm carrying an axial load of 2500 kn. The safe bearing capacity of soil is 250kn/m2 and the permissible bearing pressure on concrete is 4000 kn/m2 b) Write the steps to design the riveted joint.
c) Design a tension member suing two angle to carry 180kn when both angles are connected on both sides of gusset plate with 20mm diameter power driven shop rivets. Take bat = 150 N/mm2
Click Here To More MSBTE Papers