32 / 2022-03-13 06:05:30

Evaluation of bending load bearing capacity of RC beam subjected to partial heated and water cooling

RC beams, heating, rapid cooling, maximum load ratio, initial stiffness ratio

When Reinforced concrete (RC) structures were exposed to fire, the performance of the structure deteriorated. Additionally, RC member exposure discharging water from firefighting activities during a fire, surface temperature of RC member caused to drop and deteriorating. In the above cases, the rapid temperature rising due to fire and the rapid temperature drop due to water discharge can cause significant degradation of RC performance.

Recent studies reported residual mechanical properties of concrete specimens and bending load capacity of RC members after a fire. However, few papers reported the effects of residual load-bearing capacity of RC members after heating and rapid water cooling. In this study, we discussed residual bending load-bearing capacities of RC beams subjected to partial heating at 850°C for 30 minutes, then water discharging for 5minutes. RC beams subjected to heating alone were compared by citing data from a previous paper. From Bending loading tests, the maximum load ratio and initial stiffness ratio were calculated.

As a result, the compression area heated and water discharging in RC beam, maximum load ratio and initial stiffness ratio were 0.80 and 0.78, respectively. The compression area was heated in RC beam, the maximum load ratio and the initial stiffness ratio were 0.95, 0.50, respectively.