EXPERIMENTAL STUDY ON HIGH STRENGTH BOLTED FRICTION JOINTS WITH HF-SPLICE-PLATES

Abstract

Previously, the authors have studied and clarified the theoretical conditions for realizing a friction coefficient of over 1.2 for high-strength bolted joints. To meet the conditions, HF-splice-plates with sawtooth shaped projections on the friction surfaces, large hardness and high tensile strength, have been developed. In this paper, the high-strength bolted joints using the HF-splice-plates are examined experimentally. First, standard slip tests are carried out and the results show that a slip coefficient of over 0.9 is realized even when a thickness gap of 1.0 mm between connected plates exists in the joint due to the construction tolerance. Second, cycle loading tests are conducted and it shows an interesting fact that the slip coefficient slightly increases after 10 cycle loading with a constant maximum load corresponding to a slip coefficient of 0.9 is given. Finally, buckling tests of HF-splice-plates are carried out and the results shows that the buckling strength of HF-splice-plates can be calculated based on the AIJ regulation.