Classification of rolled steel angle sections in structural steel design includes which of the following types?

Introduction / Context:
Angle sections are widely used as bracing, truss members, and secondary framing. Knowing their classifications assists in selecting members with suitable leg dimensions and properties.

Given Data / Assumptions:

• We are considering standard classifications used in steel construction and fabrication.
• Bulb angles are commonly recognized in shipbuilding and certain standards.

Concept / Approach:
Rolled angle sections are generally classified as equal-leg angles, unequal-leg angles, and bulb angles (the latter with a bulb on one leg to enhance properties). Each category serves different design needs and connection details.

Step-by-Step Solution:

Verification / Alternative check:
Review steel section handbooks: equal and unequal angles dominate building practice; bulb angles are documented for specialized applications.

Why Other Options Are Wrong:
Picking only one category omits standard alternatives and would not reflect the full classification range.

Common Pitfalls:
Assuming bulb angles do not exist in rolled products; confusing angle categories with tee or channel sections.

Final Answer:
All the above