Correct option is D
Given: Identifying the type of bracing provided in the plane of end posts.
Explanation:
Portal bracing is used in the plane of the end posts of trusses or frames. It is designed to resist lateral forces, such as wind loads or seismic forces, that act perpendicular to the longitudinal direction of the structure.
This bracing is typically provided at the ends of bridges or tall structures to ensure overall stability.
Portal bracing connects the end posts and stiffens the structure, creating a stable portal frame.
Other Bracing Types:
1. Sway bracing: Provided to resist lateral movements of columns in the longitudinal direction.
2. Bottom lateral bracing: Installed in the plane of the bottom chords of trusses to resist lateral loads.
3. Top lateral bracing: Installed in the plane of the top chords of trusses to resist horizontal loads at the top level.
