EXPERIMENTAL STUDY ON STRENGTH OF BEARING-TYPE BOLTED JOINTS BETWEEN PULTRUDED HYBRID FRP AND STEEL

Abstract

 In this study, strength of bearing-type bolted joints between pultruded hybrid FRP and steel was evaluated by applying tensile load to bolted specimens. The number of bolt rows, the type of bolt, the number of shearing surfaces, the presence or absence of bolt axial force, and the type of washer were parameters of specimens. Effects of these parameters on joint strength were investigated experimentally. As a result of the experiment, it was confirmed that by introducing the bolt axial force, the out-of-plane deformation near the bolt hole can be suppressed, and the joint strength can be about twice as large as the case without axial force. In addition, it was confirmed that the joint strength of single-lap shear was smaller by 17% at most than that of double-lap shear. Finally, a clear difference in joint strength was not confirmed in the comparison between knurling bolts for bearing-type connections and high strength bolts for friction-type connections.