The bracing provided in the plane of end posts is called-
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A.
Sway bracing
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B.
Bottom lateral bracing
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C.
Top lateral bracing
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D.
Portal bracing
Correct Answer:
D. Portal bracing
Explanation:
Portal bracing is the correct solution. In structural engineering, particularly for bridges and roof trusses, this specific bracing is situated in the vertical plane of the end posts. Its primary function is to form a rigid frame, or portal, at the structure's entrance. This allows it to effectively transfer lateral loads from the top chord level down to the foundation supports, ensuring the overall stability of the end frame against wind or seismic forces. While other types like sway, top lateral, and bottom lateral bracing provide stability in different planes or along the length of the structure, only portal bracing is defined by its position within the plane of the end posts.
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