Abstract:
Beam-column joints are pivotal for ensuring the resilience of prefabricated steel structures under various loading conditions. Fol
lowingthemajorearthquakesofthe1990s,semi-rigidboltedconnectionsemergedasapromisingalternativetotraditionalwelded
connections. This study investigates a fully prefabricated Intermediate Beam-Column Joint (IBCJ) with extended endplates,
renowned for its excellent seismic resistance. While significant progress has been made in existing research, there is still a need
to thoroughly examine the tension capacity of IBCJs concerning bolt size and explore the potential of Carbon Fiber-Reinforced
Polymer (CFRP) sheets to enhance joint performance under seismic loading. Using the finite element method, this research eval
uates the performance of IBCJ under both monotonic and cyclic loading conditions. After validation with experimental data,
the study examines various bolt diameters to assess their tension capacity, ductility ratio, secant stiffness, and energy dissipation
capacity. The findings indicate that larger bolts exhibit higher ultimate capacities and reduced deformation at failure. Addition
ally, the study investigates the optimal placement and configuration of CFRP sheets, identifying the backside of the endplates
as the most effective location. The application of CFRP significantly enhances bolt tension capacity by up to 1.2 to 1.3 times,
demonstrating its potential in reducing bolt failure risk and improving structural reliability under seismic conditions. The supe
rior performance of CFRP-strengthened bolts can play a crucial role in the design and retrofitting of prefabricated steel structures,
potentially contributing to the improvement of existing standards and practices of seismic enhancement of IBCJ.
