Using Strain Energy Method to Estimate Buckling in Steel Column AISI 1312 during Effects of Fire Hazard

Abstract

A Group of three specimens from 1312 steel were subjected to a range of elevated temperatures (700, 800, 900) Celsius to demonstrate the hazard of fire on steel columns mechanical proprieties. The results show a dangerous increase in creep strain buckling after 60 minutes from the beginning of the test and after 67 minutes failed to occur. Mechanical tests for normal and elevated temperatures were made to compare the fire hazards, the results depict reduction by 29%, 46%, 55% for young modulus of elasticity for elevated steel specimens (700, 800, 900) °C. for yield strength the value decreased by (128.4, 169.6, 189) Mpa for specimens (700, 800, 900) °C respectively. The ultimate stress reduction by (64, 78, 83) % from the normal value. whenever higher temperatures go up the lower the ultimate strain falls dawn by (50, 60, 66) % to the original ultimate strain value 0.5. the 0.2 strain % is decreased from 0.0029 to 0.0027 for 700 °C and increased to 0.011, 0.015 for (800, 900) °C respectively.