Innovative beam-column joint solutions for precast frames under seismic loading

This research aims to develop a structural frame configuration that enhances energy dissipation and displacement control during seismic events, offering a viable alternative to conventional pendulum-type precast systems. Traditional pendulum-based solutions reduce seismic forces by decoupling the structure from the ground, but they are often costly, complex, and require extensive post-earthquake maintenance. In contrast, the proposed system integrates seismic resilience directly into the frame, eliminating the need for separate isolation mechanisms. The design employs a combination of pinned and semi-rigid beam-to-column connections, compatible with dry construction methods commonly used in the precast industry. These methods offer advantages in terms of rapid assembly, reduced labor, and lower construction time. More critically, properly detailed semi-rigid connections can improve seismic performance by enabling controlled energy dissipation and predictable deformation patterns. Recognizing the crucial role of connections in seismic response, this study includes both experimental and numerical investigations of the beam-to-column joints. This dual approach provides insight into cyclic behavior, energy dissipation capacity, and failure mechanisms under seismic loads, supporting a performance-based design strategy. While the construction industry often prioritizes speed and low initial costs—sometimes at the expense of post-earthquake reparability—this research proposes a more resilient solution. The resulting frame system balances practical construction needs with enhanced seismic safety, minimizing the need for intervention after a seismic event. This innovative approach represents a technically and economically sound alternative to traditional isolation strategies, aligning with evolving performance-based design demands in modern precast construction.