Question

Select the incorrect statement from the following.
1. Purlin is subjected to biaxial bending.
2. The span of purlin is center to center of truss; purlin is located at the panel point of the truss.
3. Purlin runs perpendicular to truss.
4. Purlin is designed as a tension member.

Answer 1

Correct Answer - Option 4 : Purlin is designed as a tension member.

Concept:

Purlin:

It is a member of truss which are supported on the principle rafter and which transverse loads to the truss. These are some important properties of purlin- 

• It is a biaxial bending member.
• The span of purlin is center to center of truss, purlin is located at the panel point of the truss.
• Maximum spacing between purlins is less than 1.4 m. 
• Angle, Channel, I-sections and Z-sections are used for purlins and girders to support the cladding.