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Hollow circular columns have extensive applications in Taiwan.
The main prupose of this research is to understand how to allocate
confining reinforcement to achieve maximum confining effect,and how
ductility capacity is estimated.Finally we propose a method suggesting
how to allocate confining reinforcement in hollow circular columns for
use in engineering.First we use SAP90 to analyze the confining effect
of transverse reinforcement and to understand how it provide confining
effect in two directions, thus obtaining the confining stress of hollow
circular columns.After obtaining the stress,we further obtain an appropriate
model of stress-strain relationship of confined concrete.First we use
moment-curvature method to derive the moment-curvature relationship of
cross sections and then use curvature-area method to obtain deflections
and ductility capacity of hollow circular columns.
In this thesis,we change the amount of transverse reinforcement placed
near the outside faces of the section and transverse reinforcement tied through
wall thickness to design the confining reinforcement of hollow circular
columns in order to achieve the same effect as solid circular columns.
After obtaining the amount of confining reinforcement needed, the ductility
capacity can be estimated.Hollow circular columns designed with this
criteria have higher ductility capacities than solid circular columns.
Therefore,we can adopt this design method.
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