The authors thank assoc. prof. Hisato Hotta for his discussion. The answers to his discussion are as follows;
1) The basic model of the inner panel with the width of the steel flange considered previously by the authors was shown in this answer. Based on this model, the meanings of the equation (4) and (35) were explained in detail. The equation (31) and (40) was corrected because of careless miss.
2) It was explained that further studies will be necessary to specify the condition on an amount of longitudinal reinforcement of column and axial force in proposed simplified prediction method.
