Optimization of multi-directional fiber architecture for resistance and ductility of bolted FRP profile joints

In view of the low structural efficiency of bolted joints in pultruded fiber-reinforced polymer (FRP) profiles with mainly unidirectional (UD) fiber architecture, off-axis plies were considered as an effective way to improve bolted joint performance. An experimental study of bolted joints was conducted with laminates composed of UD basalt fiber fabrics laid-up at different ply angles and stacking sequences to optimize the lay-up with regard to...