Abstract
When Tokachi-ohhashi bridge was demolished in 1996, material tests were carried out on the reinforcing steels and forging joints. It became clear that the chemical content of reinforcing steels had been adjusted for optimum strength and forging. While the tensile strength of the reinforcing steel of 44mm in diameter measured up to JES No. 24, broad variations were recorded. The standard deviation of tensile strength for reinforcing steel of 38mm or less in diameter was found to be almost the same as that of present reinforcing sreel. However, the standard deviation of yield strength was considerably larger than that of present reinforcing steel as yield strength had not been standardized at the time of construction. The forging joints displayed full tensile strength.
