The effective cross-sectional area method for the outstanding leg is utilized as an ineffective area to evaluate the strength in the present Japanese design standard. Given that this evaluation method is fundamentally premised on experimental outcomes derived from relatively thick plates, it must be extended to brace members composed of thin plates. In this study, we conduct bolt joint experiments and numerical analyses on thin-plate angles and channel members, with the aim to elucidate the elements influencing the efficiency of the joint. We propose a unified bolt joint strength evaluation formula that also considers thin-plate members.
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