Differences between braced columns and unbraced column

 Differences between braced columns and unbraced column 

In this article, I discussed important differences between braced and unbraced column in detail.

Properties	Braced Column	Unbraced column
Purpose and Function	Braced columns are designed to resist both axial compression and lateral forces such as wind or seismic loads. They incorporate bracing elements (such as diagonal braces or shear walls) that provide additional stiffness and stability to the column, preventing lateral displacement.	Unbraced columns primarily carry axial compression loads and provide vertical support to the structure. They do not have additional bracing elements to resist lateral forces, relying on their inherent stiffness and strength to withstand vertical loads.
Load Resistance	Braced columns are capable of resisting both axial compression and lateral forces. The bracing elements provide additional rigidity and lateral stability, effectively reducing the effects of lateral loads on the column and preventing buckling or excessive deflection.	Unbraced columns primarily resist axial compression loads. They are not designed to withstand significant lateral forces, and their capacity to resist such forces is limited. Unbraced columns may be vulnerable to buckling or excessive deflection under lateral loads.
Structural Behavior	Braced columns exhibit enhanced lateral stability due to the presence of bracing elements. The bracing effectively restrains the column from lateral displacement, resulting in a stiffer and more stable structural system. Braced columns distribute the lateral forces to the bracing elements, reducing the demand on the column itself.	Unbraced columns are more susceptible to lateral deflection and buckling under lateral loads. They rely on their flexural rigidity and axial strength to carry vertical loads without significant lateral displacement. Unbraced columns may deflect more under lateral loads, potentially affecting the overall stability and performance of the structure.
Design Considerations	The design of braced columns includes the sizing and detailing of both the column and the bracing elements. The bracing system must be carefully designed to adequately resist the anticipated lateral loads, while the column must be designed to carry both axial compression and reduced lateral forces.	The design of unbraced columns primarily focuses on their ability to carry axial compression loads. The column is sized and detailed to ensure it can safely support the vertical loads without experiencing excessive deflection or failure.
Applications	Braced columns are commonly used in structures that experience significant lateral loads, such as high-rise buildings, bridges, and structures located in seismic zones. The bracing elements provide the necessary lateral stability and resistance against wind or seismic forces.	Unbraced columns are commonly used in structures where the lateral loads are minimal or can be adequately resisted by other structural elements, such as shear walls, frames, or braced bays. They are commonly found in low-rise buildings and structures with relatively low lateral load demands.