抄録
We carried out monotonous tension tests for full scale specimens of the end of beam having widened flange welding steel pieces to both sides, and examined using method of fracture mechanics. The specimen's variable factors are widening angle and method of the installation welding of widening plates. As a result, the followings became clear.
1. It is desirable to make widening angle equal to or less than 30°, and to make the penetration of welding of widening plate and beam flange sufficiently.
2. It is desirable to change smoothly the section at the starting point of widening on which the strain concentrates.
