In slip tests of thick plate joints, many experimental studies have reported that the slip capacity obtained from test results is often unstable. One of the causes of this instability is attributed to the warp distortion of splice plates that occur during the manufacturing process. Therefore, in this study, FEM analysis was conducted on frictional joints using inorganic zinc rich paint, parametrically varying the thickness of the splice plate and base plate, the warping pattern of the splice plate, and the number of bolt rows. The analysis revealed that it is necessary to consider the effect of warping for plate thicknesses of 60 mm or more, and stable slip capacity evaluation becomes possible with four or more rows of bolts.
