Abstract:
The results of a study of stair slabs by using finite
element technique have been presented in this thesis. The
behavior of both Dog-legged and Open-well type of stair have been
analyzed. Both thick and thin shell finite elements have been
used for this purpose and the results of the analyses by both of
these elements compare well. Sensitivity study of the critical
parameters of the stair slab has also been carried out to make
the findings more generalized.
The stair slabs, usually being supported on walls or beams
at landing levels, derive significant rigidity from such
supports. This reduces the magnitude of the moments that would
have otherwise resulted.
The leading codes of practice do not provide proper
appreciation to this distinctive feature of stair slabs arising
out of its supporting arrangements. The design moments for the
stair slabs, under study, have been found to be considerably
smaller than those commonly suggested by the Codes of Practice.
Based on the findings of the present study, a new design
rationale has been suggested, for both Dog-legged and Open-well
type of stairs.
