"EFFECTIVENESS OF OVERLAPPING HOOPS AS DUCTILITY REINFORCEMENT IN SHORT REINFORCED CONCRETE COLUMNS"
"EFFECTIVENESS OF OVERLAPPING HOOPS AS DUCTILITY REINFORCEMENT IN SHORT REINFORCED CONCRETE COLUMNS"
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Date
1989-09
Authors
UKARU, Bello Sanda
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Abstract
The effectiveness of two common arrangements of
overlapping hoops, the diamond-shaped and the
rectangular overlapping hoops, is studied in relation
to the single rectangular overlapping hoops
arrangement. Short reinforced concrete columns are
used for this purpose. The tests are divided into
three parts.
In the first part, the relative effectiveness of
the two arrangements of overlapping hoops to the
single hoops arranagement is studied. In the
second part, the diameter of hoops is changed and
its effect on ductility studied. The third part
deals with the study of the effect of concrete
grade on ductility of confined concrete.
To determine the ductility of each arrangement,
stress-strain curves are drawn. From theory, it
is known that the ascending part of the curve has
no effect on the ductility of confined concrete. But
the angle of slope of the falling branch determines
its ductility. This angle is therefore calculated
and used as a measure of the ductility of each
specimen. The smaller the angle, the more ductile
is the confined concrete column.
The Universal Testing Machine is used to carry
out these tests. Concrete Cube Strength Test and
and Tensile Test for Steel are carried out. The strains
are measured by Dial Gauge and Electrical Strain
Description
A thesis submitted to the Post-graduate School, *
Ahmadu Bello University, Zaria in partial
fulfilment of requirements for the degree of
Master of Science in Civil Engineering (Structures).
Department of Civil Engineering
Ahmadu Bello University
Zaria, Nigeria
September, 1989
Keywords
EFFECTIVENESS,, OVERLAPPING,, HOOPS,, DUCTILITY,, REINFORCEMENT,, SHORT,, REINFORCED,, CONCRETE COLUMNS