Nz Steel Structure Diaphragm In-Plane Research and Practice

Abstract eng:
This paper summarizes issues related to the in-plane design of floor diaphragms in multistory steel buildings subject to earthquake shaking and describes areas requiring special consideration in design and for further research. It is shown that there is currently no accepted method to estimate the global likely demands on floor diaphragms appropriate for use in design, but the strengths and weaknesses of different approaches are summarized. The methods by which in-plane forces enter diaphragms; (i) inertia forces, (ii) transfer forces, (iii) slab bearing, (iv) compatibility and (v) interaction with other elements, are described. Methods available to transfer force within the diaphragm and to the beams and supports are discussed, and it is shown how the strut-and-tie method may be applied at the beam centres to obtain shear stud and beam axial forces. Finally, it is shown that if all slab forces are assumed to be resisted in a limited number of bays, special consideration is required for the location of shear connectors and tie reinforcement.

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