In commercial construction projects in Australia, "engaged columns" (also known as "engaged piers") refer to vertical structural elements that are partially embedded or integrated into a wall. Unlike freestanding columns, engaged columns are bonded to the wall and often project partially from its surface. These columns provide additional structural support and stability to the wall and the overall building structure.

Engaged columns can serve several purposes in commercial construction:

1. Structural Support: They help in bearing loads and distributing weight more evenly across the structure, enhancing the building's stability and strength.

2. Aesthetic Appeal: Engaged columns can also be used for decorative purposes, adding architectural interest and detail to the facade or interior walls.

3. Reinforcement: They reinforce walls, particularly in areas where additional support is needed, such as at corners or where large openings are present.

4. Integration with Other Structural Elements: Engaged columns can be designed to integrate seamlessly with other structural components like beams and slabs, contributing to the overall coherence of the building's structural system.

In Australian commercial construction, the design and implementation of engaged columns must comply with relevant building codes and standards, such as the National Construction Code (NCC) and Australian Standards (AS), to ensure safety, durability, and performance.