Seismic reliability analysis of a new precast concrete beam-column joint under reversed cyclic loading

A novel precast concrete beam-column joint is developed to enhance the seismic behavior of prefabricated structures. Considering the inherent randomness in material properties (concrete compressive strength, longitudinal reinforcement tensile strength, and connector plate yield strength) and loading uncertainties, Latin hypercube sampling (LHS) was employed to generate probabilistic model parameters. Finite element analysis of the joint under stochastic conditions was implemented via the ABAQUS, incorporating nonlinear material behavior and contact interactions. The Park-Ang dual-parameter damage model was adopted to quantify joint damage severity, which served as the limit state criterion for reliability analysis. Structural failure probabilities across multiple damage thresholds were evaluated using second-order fourth-moment reliability theory. Additionally, Tornado graph-based sensitivity analysis identified critical parameters influencing seismic resistance. Results demonstrate that the proposed precast concrete beam-column joint exhibits significantly lower damage index (the mean reduced by 10.7 %) and collapse probabilities (reduced by 24.2 %) compared to conventional cast-in-place joints, confirming its superior seismic resilience. Sensitivity analysis revealed that longitudinal reinforcement tensile strength and cast-in-place concrete compressive strength dominate performance variability. These findings underscore the necessity of stringent quality control measures in prefabrication, particularly in ensuring robust mechanical interlock between beam-end longitudinal reinforcements and minimizing voids in cast-in-place concrete regions.