42015-03-31 , 法政大学大学院デザイン工学研究科
When functions of bearings in girder type steel bridges are lost due to generation of rust and so on, it is known that fatigue damage is prone to occur there. Some methods for improving fatigue durability of the bearing have been proposed and actually applied, but the most suitable countermeasure and the concrete structural detail have not been made clear yet. This study aims at improving fatigue durability of the bearing parts in steel bridges by relatively easy repair methods which are installing vertical stiffeners, finishing the weld toe and deepening weld penetration of the welds between sole plates and lower flanges. Effects of above-mentioned methods have been examined through stress measurement tests, fatigue tests, and stress analyses on model specimens.