Design of Steel Structure 2025

(a) If wind or earthquake load is acting, how much more stress can you allow in bolts or rivets as per IS 800:2007?

1. 15% more
2. 33% more
3. 20% more
4. 25% more

(b) What is the factor of safety typically used in the Working Stress Method for steel structures?

1. 1.67
2. 1.5
3. 2
4. 1.76

(c) In Limit State Design, the partial safety factor $\gamma_m$ for materials is usually taken as:

1. Equal to 1
2. Greater than 1
3. Equal to $\gamma_f$
4. Less than 1

(d) Which section, according to IS 800:2007, reaches yield stress in the extreme fibre but local buckling prevents it from developing plastic moment capacity?

1. Plastic
2. Slender
3. Semi-compact
4. Compact

(e) In an eccentric bolted connection, the bolt group is subjected to:

1. Only shear
2. Only tension
3. Combined shear and tension
4. Only compression

(f) Which type of bolt is suitable to withstand stresses that change direction repeatedly?

1. Black bolt
2. Turned and fitted bolt
3. Ordinary unfinished bolt
4. High strength bolt

(g) Which factor influences the size of a fillet weld most?

1. Length of the weld
2. Thickness of plates being joined
3. Distance between welds
4. Quality of steel

(h) Shear lag effect in a tension member is significant when:

1. Connection is at the centroid directly
2. Member is made of only plates
3. A part of cross-section is not connected directly
4. Holes are drilled away from centroid

(i) The effective length of a column fixed at one end and free at the other is:

1. $L$
2. $2L$
3. $L/2$
4. $L/\sqrt{2}$

(j) Block shear failure in plate girders typically occurs:

1. In the flange
2. At web-flange junction
3. At the connection between web and stiffener
4. Along a plane through the bolt line and edge of the plate

(a) What are the advantages and disadvantages of steel structures? How do you classify connections provided in a steel structure?

(b) Sketch and briefly explain any three failure patterns of bolted connections.

(a) Design a double cover butt joint between two plates of width $300\text{ mm}$, if the thickness of one plate is $18\text{ mm}$ and the other is $10\text{ mm}$. The joint has to transfer a factored load of $480\text{ kN}$. The plates are of Fe 410 grade. Use M20 bolts of grade 4.6. Cover plates are $8\text{ mm}$ thick.

(b) Write three advantages and disadvantages of welded joints.

(a) Explain the various types of loads to be considered and load combinations to be considered in the design of steel structures.

(b) Write the specifications provided by IS 800:2007 for fillet welds and butt welds.

(a) Explain the purpose of lug angles in tension member design.

(b) Design a truss diagonal subjected to a factored tensile load of $180\text{ kN}$. The tension member is connected to a $20\text{ mm}$ thick gusset plate with one line of M20 bolts of grade 4.6.

(a) Write the detailed procedure for design of a bolted gusset base for a steel column.

(b) Define lateral-torsional buckling with a neat sketch and also write the assumptions.

(a) Design a column to support a factored load of $1200\text{ kN}$. The length of the column is $4\text{ m}$ and both the ends are hinged. Use steel of grade Fe 410.

(b) Illustrate the different elements of a welded plate girder with sketches.

An ISWB 350 @ $558.19\text{ N/m}$ has been used as a simply supported beam over a span of $6.5\text{ m}$. The beam has a cover plate of $200\text{ mm}$ width and $8\text{ mm}$ thickness on top and bottom flanges. Determine the safe uniform load that the beam can carry in flexure if the compression flange is restrained against lateral buckling.

Write short notes on any four of the following:

(a) Limit state design method Versus working stress design method

(b) Factors affecting strength of a tension member

(c) Steel Splices & Steel Gussets

(d) Types of Tension Member & their neat sketches

(e) Modes of Failure in tension members