THE EFFECT OF THE FLANGE RESTRAINT EFFECT OF STEEL BOX GIRDER BRIDGES ON THE BENDING BUCKLING STRENGTH OF THE WEB

Abstract

This research has aimed to construct the fully automated high speed joining system with the end of the joining instantaneously, and enabling the application of the flash welding which does not require the skill to building structures. As for this joining method, the electric capacity for joining and weight of the device is too large to apply the flash welding to large section members and site joints. In order to decrease electric capacity, basic experiments were conducted with parameters of the current and the flash time. As a result, it was confirmed to be able to join steel materials of the circular cross section of 200cm² in the sectional area in electric capacity of 1/50 or less compared with the past. Moreover, it was confirmed that the joint of the H-shaped steels and the box section steels were also possible.