EXPERIMENTAL STUDY OF FATIGUE PROPERTIES OF COMPOSITE ADHESIVE-BOLT-HYBRID CONNECTION

FRP composites which possess advantages including light-weight，anti-corrosion and good insulating property，have broad application prospects in electric power industry． Based on the static tension and compression research，it was carried out full-scale fatigue tests for adhesive-bolt-hybrid connections． The fatigue life and the failure mode of this kind of connection were analyzed in the different stress amplitude and loading conditions． The whole process of development of cracks at the adhesive joint was revealed under constant amplitude cyclic loading and the degradation index of structure bearing capacity was also given． The results showed that the end of connection using epoxy resin adhesives as bonding materials between the complex bar and the steel sleeve was pulled out，which was a typical brittle failure． The shear bearing capacity of the joint was low，which had greater discrepancies with theoretical calculation values． The bearing capacity only decreased by 6. 8% after 2 million cycles under the tensioncompression conditions， indicated that the adhesive joints had excellent shock absorption and anti-fatigue performance． Which provided a basis for engineering applications and theoretical analysis of complex tower structure．