ESTIMATION BY REBOUND-TYPE HARDNESS ON MECHANICAL PROPERTIES OF STEEL SUBJECTED TO THERMAL HISTORY ASSUMING FIRE

Abstract

For examining the applicability of Leeb hardness test to the estimation of echanical properties of steel bridge members, a series of experiment was carried out. The plate thickness, support conditions, and surface treatment conditions assuming the application to existing steel bridge members had little effect on the measurement accuracy. Although the mechanical properties of general rolled steels could be estimated by the Leeb hardness, those of TMCP steels could not be estimated. The experimental results suggested that the chemical compositions and steelmaking method of target steel materials might affect the applicability of Leeb hardness to the estimation of mechanical properties of steel bridge members.