건설재료시공학연구실

Building material & construction lab.

Abstract

In this study, residual load of reinforced concrete column have been evaluated at elevated temperature. On the basis of the previous experimental results of ultra-high-strength-concrete(UHSC) , prediction process for residual load of column member subjected to elevated temperature have been proposed. Reinforced concrete column member was made of 200 MPa concrete and was heated by ISO-834 standard heating curve for 3 h. Internal force degradation and fire resistance performance of column member was evaluated by measuring internal temperature and axial deformation. Also, after heating, residual axial load capacity was evaluated through natural cooling for 24 h. Prediction process of residual internal force of UHSC column was proposed by deriving model for internal force degradation with previous experimental results of residual mechanical properties and spalling properties of UHSC subjected to elevated temperature. In the test for fire resistance performance of column, 26% of section was lost due to spalling, however, it was observed that residual internal force was 52% of design axial load