Question

In a roof supporting space truss, the load is transmitted as:

(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 at a job interview.

Question is taken from Space Trusses in division Structural Analysis of Engineering Mechanics

Answer 1

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

To explain: 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.