Question

In a roof supporting truss the load is transmitted when ________

(a) First to the truss then the joints through purlins

(b) First to the purlins then the joints through trusses

(c) First to the truss then the purlins through joints

(d) First to the joints then the trusses through purlins

I have been asked this question by my college professor while I was bunking the class.

The query is from Simple Trusses topic in chapter Structural Analysis of Engineering Mechanics

Answer 1

Correct answer is (a) First to the truss then the joints through purlins

The explanation is: The roof load is transmitted to the truss first. It is then transmitted to the joints. This transmission of the force or the load from trusses to the joints is achieved by the purlins. Thus the distribution of the load.