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

本文的主要研究成果如下：(1)通过对宽幅试件进行拉伸试验，对严重锈蚀拉伸板的剩余强度估算方法进行了改进，使其具有更高的可靠性。(2)提出了一种适用于便携式超声波测厚仪的厚度估算公式。(3)通过对旧“阿马鲁贝大桥”的材料性能测试和化学成分分析，为旧桥的强度恢复提供了一些有益的认识。(4)通过对严重锈蚀板件的屈曲试验和有限元分析，阐明了腐蚀对荷载偏心的力学影响。

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