Which of the following are true about roof trusses?
(a) principal rafter are compression members used in buildings
(b) principal rafter is bottom chord member of roof truss
(c) struts are compression members used in roof trusses
(d) struts are tension members used in roof trusses
The question was asked in an interview for job.
My question comes from Compression Members and Loads on Compression Members in chapter Design of Compression Members of Design of Steel Structures