抄録
Effect of yield ratio on Box Section Members' Ductility were investigated by numerical analysis. To consider the effect of local buckling and to get the accuracy of this simulation, stress-strain relations getting from stab-column tests were used, and also the conversion theory were made to get equivalent width-thickness ratio from real width-thickness ratio using bleich's local buckling theory. From this simulation, low yield ratio improve the members' ductility in case of small width-thickness ratio, but in case of large width-thickness ratio yield ratio is not effective on the members' ductility.
