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Abstract

The use of precast concrete structures with grouted sleeve (GS) connections has gained significant traction in the acceleration of bridge construction. The plastic hinge length (Lp) is a critical parameter for assessing the seismic performance and deformation capacity of such structural members. The previous study has proposed empirical equations for Lp in monolithic columns; however, a comprehensive understanding of the influential parameters on Lp in precast concrete columns with GS connections remains limited. This study presents a detailed parametric investigation to evaluate the effects of key design parameters on the plastic hinge length of a precast concrete columns with GS connections. The analysis was performed using a three-dimensional finite element method (3D FEM); a total of 50-column models were analyzed based on the Taguchi design method. The parameters considered include the axial load ratio (P/Agf'c), shear span-to-depth ratio (L/h), longitudinal reinforcement ratio (As/Ag), and concrete compressive strength (f'c). The results indicate that the plastic hinge length increases with higher axial load ratios. Conversely, an increase in concrete compressive strength leads to a reduction in plastic hinge length. Furthermore, a column with 685 MPa reinforcement exhibited shorter plastic hinge lengths compared to those with 420 MPa reinforcement. This study provides valuable quantitative insights and a robust dataset to better predict the seismic behavior of precast concrete columns with grouted sleeve connections. In the future, experimental validation and analysis under cyclic loading are expected.

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