Diaphragm braced strut-purlins are commonly used in the roof systems of
metal buildings. However, the design problem of combined uplift and axial loads
on these members is not adequately addressed in the 1989 AISI specification.
The objective of this thesis is to provide experimental evidence that strut-purlins
can be designed with an existing interaction equation. It was a/so the objective of
this thesis to find a method of determining the axial capacity of diaphragm braced
strut-purlins and to experimentally verify the accuracy of the method.