Stress measurements of the newly built Koubo dam radial gates were executed to obtain stress values in non-deteriorated condition for the future maintenance. While paying attention to the axial stress of arm near the trunnion pin, observed data were compared with FEM analysis results considering trunnion pin axial direction imperfection. Although the randomness of the imperfection became clear from these comparative results, the limit of the error to the analysis values not considering the imperfection was understood. By utilizing these findings, future maintenance of the gates may be rationalized.
