Improvement of remaining strength estimation method for corroded steel plates intended to strength performance recovery

本研究的主要结果如下：(1)通过宽幅试件的拉伸试验，尝试对严重腐蚀拉伸板的剩余强度估算方法进行修正，使其具有更高的可靠性。(2)提出了一种实用的便携式超声测厚仪测厚计算公式。(3)通过对以往“Amarube桥”的材料性能试验和化学成分分析，获得了一些对老桥强度恢复有益的知识。(4)通过对严重腐蚀板的屈曲试验和有限元分析，阐明了腐蚀对载荷偏心的力学影响

Main results of this study are as follows; (1) A remaining strength estimation method of severely corroded tensile plates was tried to modify with higher reliability by carrying out the tensile test for wide-width specimens. (2) A useful thickness estimation formula was proposed for the thickness measurement by using the portable ultrasonic thickness gauge. (3) Some useful knowledge for strength recovery of aged bridge were obtained by material property tests and the chemical component analyses about previous “Amarube Bridge”. (4) The mechanical influences for load-eccentricity due to corrosion were clarified by the buckling test and FEM analyses for severe corroded plates