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Abstract
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Since in bubble deck (BD) system, the concrete
in the middle of deck’s cross sections, mainly in the
middle of the spans, is removed, the slabs become lighter
compared to the traditional slabs. The application of this
type of structural system has been recently increased. In
the researches, the ductility factor is expressed generally
for the reinforced concrete (RC) structures, with momentresisting
system (MRS), and dual systems. These include
particularly, the MRSs, shear walls, and the flat slabs having
mainly the BD system. In this research, the variations
of the ductility of RC structures constructed with BD are
assessed by applying the numerical modeling and nonlinear
static analysis. Based on the evaluation of the obtained
results, it can be concluded that the ductility of structures
with dual systems, including MRS and shear wall
(MRSSW), is more than the ductility of the structures with
single MRSs. In the structures with MRSSW by increasing
the ratio of the span length to story height (L/H) and also the number of stories, ductility factor will decrease and the
rates of these decreases are considerable, while in MRS the
number of stories and also the L/H ratio have less effect on
the ductility factor. Among the structures with dual systems,
including MRSSW, the low-rise structures with high
ratios of span length to story height have the least value of
ductility. As a conservative approach, a ductility factor of
3 for MRS structures is proposed. In addition, in MRSSW
structures, for 4, 8 and 12 story structures, as a representative
of low-rise, mid-rise and high-rise structures, the ductility
factors of 6, 4 and 3 are suggested.
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