PREDICTION OF STRUCTURAL RESPONSES USING NATURAL FREQUENCY MEASUREMENTS
ABSTRACT: This paper
demonstrates that prediction
of structural responses
can experience significant
errors due to the
modelling errors or uncertain input even for simple structures. The responses
of two simple reinforce d concrete beam, as as
examples of simple
structures, were measured
to be compared
with the prediction .
To improve the
predictions, the relationship
between static stiffness and modal s tiffness of a structure is determined ,
which provided a basis for using the measured natural frequen cies replacing
the calculated natu ral frequencies, where modelling errors are normally occur.
Using the natural frequency measurements significantly improves the quality of
the predictions of the two actual beams.
As applications, to predict the static response of
a real seven storey
concrete building and
the dynamic response
of a simple supported
reinforced beam subjected to
jumping loads are
developed. The prediction of
static response of the
building using the first two measured natural frequencies during cons truction
is close to the numerical prediction, this is due to
the building is
a test building does not
have secondary elements
such as walls,
beams and partitions
in it . The quality of the prediction
of the dynamic response of a concrete
beam subjected to jumping loads improves
signi ficantly from the use of the measured natural frequency.
Author: Endah Wahyuni
Journal Code: jptsipilgg090010
