ANALISIS PENGARUH KONFIGURASI TULANGAN TERHADAP KEKUATAN DAN DAKTILITAS KOLOM BETON BERTULANG

Abstract

Column is one of important structural elements to ensure that the
structure will not suffer progressive collapse. In earthquake resistant design,
column must have an adequate strength and ductility to provide ductile behavior to
desipate earthquake forces on the structure. Strength and ductility of columns
depend on many factors such as reinforcement arrangements. This analysis is done
to investigate the effect of longitudinal dan transversal reinforcement arrangement
on strength and ductility of reinforced concrete columns. Two groups of 4 specimens each, total 8 column sections were analized both with
and without considering concrete confinement. In this analysis, stress-strain
concrete model for unconfined concrete follows Honestaad Model (1951) and for
confined concrete model follows Razvi and Saatcioglu Model (1999). Stress-strain
of reinforcement is assumed to be a bilinear relationship. In the analysis of
displacement ductility, the column height was taken of 3.5 meter behaving double
curvature.
Comparison of the results shows that for constant longitudinal reinforcement ratio
(rl), arrangements of longitudinal bars distributed uniformly along the column
sides has no significant effect on strength and ductility of the column section both
for unconfined and confined section analysis.
Hoop configuration gives an increase in strength (Mn), curvature ductility (?j) and
displacement ductility (?D) on average about 1.2%, 2.3% and 1.83% if they are
analyzed without considering confinement effects. However, the increase in those
parameters is about 1.2%, 12%, 9.4% for strength (Mn), curvature ductility (?j) and
displacement ductility (?D) if considering the effects of confinement.
In general, the effect of hoop confinement on column section can increase in
column strength and ductility on average of 0.25%, 158% and 98% respectively for
strength, curvature and displacement ductilities.