For Steel columns, members comprising two main components are laced and tied together. In the diagrams given below, different types of lacing systems are shown for face A-A (Left) and Face B-B (Right), identify the incorrect lacing system:
- AB and C
- BB and DCorrect
- CA and D
- DA and C
Solution
Concept
Lacing on opposite faces
Step-by-step solution
1. On opposite faces, single lacing must be in the same direction (so that it is a continuous system) or double lacing used on both faces. 2. The key marks the systems B and D as incorrect.
Explanation
Following the key: the arrangements shown in B and D do not match the lacing rules for the two faces.
Why the other options are wrong
A and C are shown as acceptable.
Correct answer: B) B and D