Bolted Connection Strength and Bolt Hole Size

This study investigated the effects of oversized bolt holes on the properties of bolted connections with steel side members. The intent of the study was to determine (1) how well the European Yield Model (EYM) predicts experimental results for connections with oversized bolt holes and (2) how the loaddeformation behavior of connections is affected by oversized and/or misdrilled holes. Variables included bolt hole size, angle of hole relative to member surface, and orientation of load relative to wood grain. The study revealed that the EYM predicts connection yield load for connections with oversized bolt holes with acceptable accuracy. Results indicated little difference in yield load or maximum load with increased bolt hole size. Results indicated a reduction in load of up to 21 percent with increased bolt hole size and an additional reduction of up to 63 percent when holes were drilled at a 2° angle from perpendicular to the member surface.