A STUDY ON RESPONSE REDUCTION FACTOR OF RC WATER TANK

Abstract

the main purpose of earthquake resisting design is that the structure should not
permit to collapse but damage is allowed during earthquake. Water tank is important
structure. Staging type of tanks is generally collapse during earthquake, so it is required to
calculate earthquake load perfectly. Past evidence had shown that the elevated tanks are
vulnerable due to earthquake. The tanks are designed based on linear elastic methods which
are considered only elastic range. Factor shows the reserved strength of water tank.in
IS 1893-2002(part-2) value of R factor for RC elevated shaft supported tank is 1.8 and for
column supported 2.5. One constant R-value for elevated water tank cannot reflect the
expected inelastic behavior of all elevated water tanks located in different seismic zone and
having different staging pattern. So it is required to find out perfect value of R factor for
various type of RC elevated tank individually. The present study efforts are made to evaluate
the response reduction factor of RC framed staging elevated water tank having varying staging
height, capacities, staging type and zones. The main objective of this study is to verify the R
factor of most common designed Elevated Intze tank through comparing the assumed R factor
during design to actual R factor obtained from non-linear analysis.