BEHAVIOR ANALYSIS OF POST-TENSIONING CONCRETE BEAMS EXPOSED TO HIGH TEMPERATURE BY USING FINITE ELEMENT METHOD (ANSYS PROGRAM)

This research is conducted to study the behavior and load carrying capacityof post-tensioning concrete beams exposed to fire flame. The exposure ofthese beams to fire causes changes in their structural behavior.Finite element method was used to idealize the effect of burning by fireflame exposed to post-tensioning concrete beams. The beams that weresubjected to fire flame at temperature levels of (300, 500 and 700 ̊C) for 1hour period of exposure at age of 60 days were determined.A three-dimensional nonlinear finite element model was adopted toinvestigate the structural behavior of post-tensioning concrete beamsspecimens with and without exposure to burning. Good agreement wasobserved between the adopted finite element model results and experimentalresults. It is found that the theoretical values of beam capacity exceedsvalues by a margin the experimental ranging between (1-23%) after burningfor the analyzed beams specimens. The adopted finite element analysisshowed, also, good agreement with experimental results throughout theload-deflection behavior before and after burning.

Keywords:

Post tensioning , concrete beam , fire flame , load capacity , finite element