Structural behaviour of ceiling diaphragms in steel-framed residential structures

In residential structures, the ceiling structure is utilised as a structural diaphragm to transfer the lateral loads acting on the roof to the bracing walls. In steel-framed houses, the ceiling diaphragm is typically made of plasterboard lining screwed into steel ceiling battens which in turn are attached to the bottom chords of roof trusses. While the ceiling diaphragm is relied upon to perform an important structural function, there is very limited guidance available on the structural behaviour of such diaphragms. This paper presents results from experimental and analytical models which provide strength and stiffness data for typical diaphragms. These data can be used to carry out rational design for such diaphragms.