Lacing bars for compression members – basic detailing rules Which of the following statements about lacing of built-up compression members are correct?

Introduction / Context:
Lacing transforms individual components into one built-up compression member that acts integrally. Codes provide detailing rules to ensure sufficient stiffness and strength against shear and buckling.

Given Data / Assumptions:

• Traditional IS working-stress design guidance is referenced.
• Member is a built-up column with lacing flats or angles.
• We compare typical limits for width, thickness, slenderness, and inclination.

Concept / Approach:
Limits on slenderness (for lacing stability), minimum width and thickness (for connection and durability), and inclination (for efficient shear path) are prescribed to keep the lacing system effective without being overly flexible.

Step-by-Step Solution:

Verification / Alternative check:
Compare with classic Indian steel design texts; the numerical limits are consistent with standard practice problems.

Why Other Options Are Wrong:
Each individual statement aligns with standard rules; therefore the comprehensive choice “All the above” is the correct answer.

Common Pitfalls:
Using too slender lacing that buckles; inadequate width leading to poor edge distances; inclination too shallow or too steep causing inefficiency.

Final Answer:
All the above