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The purpose of this experimental study is to investigate the validity of code equation to calculate the block shear capacity in the limited state design codes of steel structures and to offer basic research data of the block shear rupture by comparison with the previous studies. According to result the tensile testing of staggered and double-row bolted connections by using high strength bolt of single angles are as followings; There are manifest difference between the actual shear rupture line and the theoretial shear rupture line if the block shear rupture is occurred. The professional factor tends to be more safe when the theoretical rupture line following is applied by code equation. Nevertheless, in the current limited state design codes of steel structures, it does not considered about the estimation of the actual rupture line, the effect of shear lag by the outstanding leg and the effect of eccentricity of load by using stagger in order to calculate the block shear capacity. Therefore, there must be an additional research about the effect of stagger and the reduction of capacity that is represented by the effect of eccentricity of load.