Abstract
Owing to the engineering application demands for the reinforcement of complex joints in multiplanar circular hollow section (CHS) trusses, this study investigated the reinforcement methods and static performance of KT-joints strengthened with carbon fibre-reinforced polymer (CFRP) sheets. First, CFRP reinforcement strategies for KT-joints were studied. Experimental comparisons in static performances were then conducted between bare and CFRP-strengthened CHS KT-joints. Meanwhile, CFRP reinforcement mechanisms were analysed. Finally, CFRP effective strain index η was proposed for quantitative assessment of CFRP strength utilisation. The results indicated that CFRP effectively restrained chord depression and expansion deformation, prevented local buckling of the compressive brace, and reduced strain concentration near the intersection lines. Compared with the bare joint, the ultimate load-bearing capacity and ductility of the joint reinforced with 4 layers of CFRP sheets on the chord and 3 layers on the braces increased by 24% and 25%, respectively. The initial stiffness of the joint at compressive and tensile brace locations increased by 48% and 375%, respectively. The η varied at different regions of the joint, with the maximum η found near the K-shaped gap and the intersection line of compressive brace. Based on the distribution of η, strategies for improving CFRP strength utilisation were proposed.
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