ENERGY DISSIPATION OF ECCENTRICALLY-BRACED-FRAME (EBF) WITH DIFFERENT LEVEL OF ECCENTRICITY
ABSTRACT: This research
aimed at eliciting the
form of relation
that exists between
level of eccentricity (e/L) and
energy dissipation (Ed) of an Eccentrically Braced Frame (EBF). It continued a
previous research that studied relative stiffness of an EBF. Three sets of EBF specimen
were analysed by
the merit of
SAP2000 v9.0.1 computer-software to obtain range of inelastic drifts and its
corresponding range of lateral loads. Specimens vary in level of eccentricity
(e/L) and bay to height ration (h/L). Prior to it, a formula that calculates
energy dissipation of a lateral
resistant structure as
product of lateral loads and the corresponding drifts
was developed and used throughout the research for the purpose
of quantifying Ed.
Each specimen was
alternatively loaded in
direction confronting and concurring
the bracing component.
It was found
that there was no
significant difference in
the form of
relation between e/L
and Ed, when
lateral load applied confronting
bracing component from
when the same
load applied concurring bracing component.
Forms of each
graph that relates
e/L to Ed
was presented and shown to consists of two parts, divided
at e/L = 0.2; suggesting that e/L = 0.2 might be the point
where level of
eccentricity and relative
stiffness of an
EBF reach optimum. Mathematical equations
for the relation
between e/L and
Ed of an EBF were
then developed. In spite
of this, an
inconsistency with the prevalent
theory was observed, hence the
relations between e/L
and Ed concluded
so far were
contested until further researches be made for clarification.
Author: Jusuf J. S. Pah, Yanes
E. Oematan
Journal Code: jptsipilgg120004
