Abstract:
Post-earthquake fire is an aftermath of major earthquakes. This coupling action of seismic
loading followed by fire in various degrees reduces performance of built-in structures and it is
not uncommon to see a collapse of structures when exposed to both earthquake and fire even
though structures were originally designed for life safety with no collapse requirement.
This thesis works numerically investigates and compares behavior of a reinforced concrete
column subjected to seismic lateral loading and post-earthquake fire loading. Experimental result
reported in literature was used for validation analyses using ANSYS finite element software
program and further parametric studies on influential parameters such as concrete cover, axial
load ratio, and fire exposed side were performed to get insight into the performance of a
reinforced concrete column under both seismic and post-earthquake fire loading.
Finite element validation analysis result showed good agreement with experimental residual
lateral load capacity of the column with margin of error of 4.7% and 2.2% in predicting lateral
load capacity and ductility ratio. Size of concrete cover influenced insulation efficiency and
residual strength. As compared to 35, 40, 50mm concrete cover, nominal 25mm concrete cover
exhibited 3.2%, 19.1%, and 59.63% increment in re-bar reinforcement temperature. Also, post-earth quake fire (PEF) peak lateral load capacity of a column and fire resistance decreased by
8.1% compared to singular seismic lateral loading.
Keywords: post-earthquake fire; seismic lateral loading; reinforced concrete column, Finite
element analysis; ANSYS