What are the main components of a typical structural steel erection sequence?

• A. Erect columns, install floors/beams, brace the frame, install interior and exterior elements, and complete connections with permanent bracing.
• B. Paint surfaces only.
• C. Install roofing first.
• D. Remove all temporary bracing before any erection.

Answer: (A)

The main concept here is building the structure in a safe, progressive order that creates a stable load path as you go. In a typical structural steel erection, you start by erecting the columns to establish the vertical framework. Next, you install the floors and beams to form the horizontal spans and provide working platforms. Then you brace the frame to maintain stiffness and stability during lifting and assembly. After the frame is established, you install interior and exterior elements, and finally you complete the connections with permanent bracing to lock in the geometry and transfer loads. Temporary bracing supports the structure during erection and is addressed as the frame becomes self-supporting with permanent bracing and connections.

This sequence matters because it prioritizes safety, crane workability, and proper load transfer as the building is assembled. Other options don’t fit because painting surfaces is a finishing task, not part of erecting the frame; roofing cannot be placed until the structural frame and bracing are in place; and removing all temporary bracing before any erection would abandon essential stability during construction.