Question

Which of the following roof components resists compression?

O top chord
O vertical web
O bottom chord
O king post

Answer 1

The top chord is the component of a roof that resists compression, as it operates under the downward force exerted by the weight of the roof and transfers the load at the peak of the roof truss.

Therefore, top chord is the correct answer.

Step-by-step explanation:

The component of a roof that resists compression is the top chord. Roof trusses are typically triangular structures designed to distribute the weight of the roof, and the top chord, or upper member, operates under compression as it pushes down towards the peak of the truss where the load is transferred. In contrast to the top chord, the bottom chord is generally in tension, reacting to the spreading force that it receives where it meets the lower ends of the web members. The vertical web primarily resists shear forces, and the king post is used to prevent the truss from spreading apart, mainly resisting tension.

Answer 2

The bottom chord of a roof truss resists compression.

Step-by-step explanation:

The bottom chord of a roof truss is the component that primarily resists compression. It is the horizontal member of the truss that supports the load from the roof. When a load is applied to the truss, the bottom chord provides resistance against compression forces, preventing the truss from collapsing.

The other components mentioned in the question are not designed to resist compression. The top chord of a roof truss resists tension forces, the vertical web provides stability against lateral loads, and the king post is a vertical member used in some truss designs to provide additional support.