Akademik Veri Yönetim Sistemi
International IDU Engineering Symposium – IES’20 , İzmir, Türkiye, 5 - 13 Aralık 2020, cilt.1, no.1, ss.1-10
The fire
performance of the structures has been subject of research interest over the
past decades. To date there exists many research works on the topic of
structural analysis of building elements under the fire load. Whilst many of
these studies are identifying the fire behavior of structures from mechanical
and material perspectives, but they still remain narrow when it comes to determination
of dynamic characteristics of fire exposed structural members.
Within this scope,
experimental fire test provides close to real results and facilitates the
evaluation of structural fire behavior. Additional to experimental studies,
finite element analysis (FEA) can be used to validate the results of the
experimental fire tests. Also, the use of FEA is far more feasible alternative
in camper to experimental one, which allows for replication of study over
various test parameters. So in order to evaluate the effect of elevated
temperature on dynamic characteristics of buildings, this study conducted an
experimental analysis to assess the effect of fire on structural and modal
behavior of a reinforced concrete (RC) column, as one of the most important
load-bearing elements of the buildings. Afterwards, FEA has been used to confirm
the results obtained from both thermal and modal evaluation of the performed experimental
test, concentrating on elevated temperature effects on changes in dynamic characteristic
of RC column. Initially, an experimental fire furnace test was conducted over a
RC column with height of 1.5m and square cross-section of 0.2m. Besides, the dynamic
characteristics of test specimen have been recorded both before and after of the
fire test. Followingly, FEA software has been used for cross validation of
experimental results. Thus, the comparison between the experimental and FEA is
to be used as the basis of modal analysis of RC column under the fire load. The
ISO 834 standard fire curve with exposure duration of 3 hours has been used for
both experimental and FEA. The results show the effects of fire on changes in
dynamic characteristics of RC columns. It is also observed that increases in
temperature reduces the natural frequency of RC column. In addition, the mode
shapes of RC column are also affected by high temperature. However, no specific
pattern could be obtained explaining the changes in mode shapes of RC column
under the fire load. Furthermore, all of the obtained experimental and FEA
results are in good agreement with each other.