Effect of High Temperature on the Strain Behavior in Post-Tensioning Concrete Beams by Using Finite Element Method (ANSYS Program)

摘要

This research is conducted to study the of effect of high temperature on the strain Behavior in post-tensioning concrete beams exposed to fire flame. The exposure of these beams to fire causes changes in their structural behavior. Finite element method was used to idealize the effect of burning by fire flame exposed to post-tensioning concrete beams. The beams that were subjected to fire flame at temperature levels of (300, 500 and 700 ℃) for 1 hour period of exposure. A three-dimensional nonlinear finite element model was adopted to investigate the structural behavior of post-tensioning concrete beams specimens with and without exposure to burning. Good agreement was observed between the adopted finite element model results and experimental results of. It is found that the theoretical values of beam strain exceeds values by a margin the experimental ranging between (1-23%) after burning for the analyzed beams specimens. The adopted finite element analysis showed, also, good agreement with experimental results of throughout the load-deflection behavior before and after burning.