EVALUATION ON THERMAL PROPERTIES OF COMPOSITE MEMBER COVERED BY FIRE PROTECTION BOARD

Abstract

Steel-concrete composite members have been widely applied to immersed tunnels and anti-fire protection is required for them because their steel plates face road side. Fire test and numerical analysis by finite element method were carried out to investigate thermal properties of the composite member for vehicle fire in the tunnel. Maximum temperature of the material was within allowable temperature. However deformation of the steel plate was observed during the fire test due to elongation of steel plate and steam pressure. It was proved that the gap between the steel plate and core concrete should be considered for thermal analysis of the composite members.