# Design of Steel Structures Questions and Answers – Lug Angles, Splices & Gusset Plates

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This set of Design of Steel Structures Multiple Choice Questions & Answers (MCQs) focuses on “Lug Angles, Splices, Gusset Plates”.

1. Lug angles are ____
a) additional angles used to reduce joint length
b) additional angles used to increase joint length
c) additional angles used for aesthetic appearance
d) additional angles used for seismic resistance

Explanation: When tension member is subjected to heavy load, the number of bolts or length of welds required for making connection becomes large, it results in uneconomical size of gusset plates. In such situations, additional short angles called lug angles may be used to reduce joint length and shear lag.

2. Lug angles are found to be more effective at _____
a) end of the connection
b) middle of connection
c) beginning of connection
d) they are equally effective at all connections

Explanation: Lug angles are found to be more effective at beginning of connection rather than the end due to non-uniform distribution of load among connecting bolts.

3. Which of the following solution can be used to eliminate lug angles?
a) by providing equal angle sections with wider leg as connected leg
b) by providing unequal angle sections with wider leg as connected leg
c) by providing equal angle sections with shorter leg as connected leg
d) by providing unequal angle sections with shorter leg as connected leg

Explanation: Lug angles can be eliminated by providing unequal angle sections with wider leg as connected leg and using two rows of staggered bolts.
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4. Which of the following is correct in case of angle members?
a) connection of lug angle to angle member should be capable of developing a strength of 10% of excess of force of outstanding leg of angle
b) connection of lug angle to angle member should be capable of developing a strength of 20% of excess of force of outstanding leg of angle
c) lug angles and their connection to gusset should be capable of developing a strength of less than 20% of excess of force of outstanding leg of angle
d) lug angles and their connection to gusset should be capable of developing a strength of not less than 20% of excess of force of outstanding leg of angle

Explanation: In case of angle members, lug angles and their connection to gusset should be capable of developing a strength of not less than 20% of excess of force of outstanding leg of angle, and the connection of lug angle to angle member should be capable of developing a strength of 40% of excess of force.

5. Which of the following is correct in case of channel members?
a) connection of lug angle to angle member should have a strength not less than 20% of excess of force in flange of channel
b) connection of lug angle to angle member should have a strength less than 20% of excess of force in flange of channel
c) lug angles and their connection to gusset should be capable of developing a strength of less than 10% of excess of force in flange of channel
d) lug angles and their connection to gusset should be capable of developing a strength of less than 5% of excess of force in flange of channel

Explanation: In case of channel members, lug angles and their connection to gusset should be capable of developing a strength of not less than 10% of excess of force in flange of channel, and the attachment of lug angle to angle member should have a strength not less than 20% of excess of that force.

6. Splices are provided when_________
a) available length is more than required length of a tension member
b) available length is less than required length of a tension member
c) available length is equal to required length of a tension member
d) for aesthetic appearance

Explanation: Splices are provided when the available length is less than required length of a tension member. Splices in tension members are used to join sections when a joint is to be provided that is these replace the members at the joint where it is cut. If the sections to spliced are not of same thickness, then packing plates are introduced.

7. As per IS specification, splice connection should be designed for a force of _____
a) at least 0.3 times the member design capacity in tension
b) at least 0.1 times the member design capacity in tension
c) less than 0.3 times the member design capacity in tension
d) less than 0.15 times the member design capacity in tension

Explanation: As per IS specification, splice connection should be designed for a force of at least 0.3 times the member design capacity in tension or the design action, whichever is more.

8. Which of the following is not correct about gusset plates?
a) gusset plate is provided to make connections at place where more than one member is to be joined
b) plate outlines are fixed to meet minimum edge distances for bolts used for connection
c) lines of action of truss members meeting at a joint should not coincide
d) size and shape of gusset plates are usually decided from direction of members meeting at joint

Explanation: A gusset plate is plate provided at ends of tension members through which forces are transferred to main member. Gusset plates are used to join more than one member at a joint. The lines of action of truss members meeting at a joint should coincide. The size and shape of gusset plates are usually decided from direction of members meeting at joint. The plate outlines are fixed to meet minimum edge distances for bolts used for connection.

9. What is the minimum thickness of gusset plate?
a) 5mm
b) 8mm
c) 10mm
d) 12mm

Explanation: The thickness of gusset plate in any case should not be less than 12mm. Structurally a gusset plate is subjected to shear stresses, direct stresses and bending stresses and therefore it should be of ample thickness to resist all these at the critical section.