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Experimental study on the mechanical performance of beam–column connections within the precast prestressed concrete assembled structural system
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DOI：10.1016/j.istruc.2026.112429.png)
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Abstract
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The Precast Prestressed Concrete Assembled Structural System (PPAS system) primarily consists of pretensioned precast prestressed concrete composite beams, cast-in-place columns formed using large steel molds, and steel-deck composite floor slabs. To ensure reliable anchorage performance, the prestressing strands reserved at beam ends are typically anchored within the beam–column joints in three configurations: straight anchorage, supplementary anchorage, and 90° bent anchorage. Four T-shaped beam–column connection specimens were designed to investigate these anchorage configurations, and static loading tests were performed. The experimental results revealed distinct failure mechanisms for the three anchorage types. Premature failure due to strand slippage occurred in the straight-anchorage specimens and the bent-anchorage specimen with a horizontal segment of 300 mm (approx. 19.7d, where d is the strand diameter). Specimens with supplementary anchorage exhibited strand fracture. For the bent-anchorage specimen with a horizontal segment of 400 mm (approx. 26.3d), an ideal flexural failure characterized by strand yielding, followed by concrete crushing in the compression zone, was observed at the beam end. Additionally, the crack patterns of the three anchorage types differed from those of conventional cast-in-place frame beams, showing fewer cracks with larger spacing. This study also proposes, for the first time, an equivalent ductility coefficient for the PPAS frame beam sections that accounts for strand slippage, enabling a more objective evaluation of the actual ductility at the critical beam-end section for each anchorage type. Furthermore, an innovative radar-chart evaluation method is introduced to comprehensively assess specimen performance based on five key parameters: sectional bearing capacity, ductility, energy dissipation, yield load, and residual deformation. Comparative analysis reveals that the overall performance of the four investigated anchorage configurations, ranked from highest to lowest, is as follows: 90° bent anchorage with a 400 mm horizontal segment, 90° bent anchorage with a 300 mm horizontal segment, supplementary anchorage, and straight anchorage. The findings provide a solid experimental foundation and theoretical basis for the design, calculation, and practical application of the PPAS structural system.
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