Experimental studies on the fire endurance of reinforced concrete beams

Abstract EN

In this study, some mechanical properties and deflection behavior of rectangular reinforced concrete beams under the effect of fire flame exposure is presented.

The properties investigated were compressive strength and load-deflection behavior of rectangular reinforced concrete beams under the effect of fire flame exposure.

The concrete specimens and beams were subjected to fire flame temperatures ranging from (25-800) °C at different ages of 30, 60 and 90 days, three temperature levels of 400, 600 and 800 °C where chosen for exposure duration of 2.0 hours.

The test results showed that the residual compressive strength ranged between (67-76 %) at 400 °C, (58-66 %) at 600 °C and (28-51 %) at 800 °C.

It was noticed that the load-deflection relation to specimens exposed to fire flame are flat , representing softer load deflection behavior than that of the control beams.

Also, it was found that the shrinkage values increase with temperature increase.