We have mentioned in our previous paper the experimental results of the static and the high speed tensile loading on the tower-shaped steel structure paying attention to the joint which is conceivably one of the most critical sections of the said structure. This paper describes the outline of our quantitative consideration of the relation between stress and strain on the basis of the results of both the previous experiment as mentioned above and the recent experiment of the static and the high speed tensile loading on specimens composed of steel angles and gusset plates.