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<p>The seismic performance of precast connections critically influences the overall structural resilience. To compare the mechanical behavior of piers with various precast connections, quasistatic tests and numerical analysis were conducted on five 1:3-scale samples. This study investigated piers with grouted sleeves, grouted corrugated sleeves, or cast-in-place references under two axial compression ratios (7% and 10%). The mechanism by which the connection design causes the plastic hinge zone to shift upward was quantitatively elucidated. The height of the plastic zone in the precast samples reached 280–320&#xa0;mm, which is 1.3–1.5 times that of the pier with the cast-in-place. Quantitative analysis revealed that the maximum reduction in yield load for the precast samples compared with that for the pier with a cast-in-place was only 4.68%, the reduction in peak load was less than 4.05%, the difference in initial stiffness was less than 7%, and the difference in energy dissipation capacity was less than 2.54%. However, the axial compression ratio (10%) significantly accelerated the rate of stiffness degradation by 62% and reduced ductility. The ductility of the pier with the grouted sleeve connection (<i>µ</i> = 3.0) was slightly superior to that of the pier with the grouted corrugated sleeve connection (<i>µ</i> = 2.7). The pier with the grouted sleeve connection exhibited a smaller residual displacement under large displacement angles and offered better reparability. This study provides direct, quantitative experimental evidence for the selection and optimization of connections in precast-assembled bridge piers.</p>

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Experimental study on the seismic performance and design optimization of precast piers with various connection types

  • 期刊论文

  • 发表日期：

    2026年7月27日

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  • Xinlei Yang,
  • Xiang Li,
  • Fa Yang,
  • Quanchang Ren,
  • Jianbao Miao,
  • Yantao Liu,
  • Yukai Zhang,
  • Qingtao Zheng

摘要

The seismic performance of precast connections critically influences the overall structural resilience. To compare the mechanical behavior of piers with various precast connections, quasistatic tests and numerical analysis were conducted on five 1:3-scale samples. This study investigated piers with grouted sleeves, grouted corrugated sleeves, or cast-in-place references under two axial compression ratios (7% and 10%). The mechanism by which the connection design causes the plastic hinge zone to shift upward was quantitatively elucidated. The height of the plastic zone in the precast samples reached 280–320 mm, which is 1.3–1.5 times that of the pier with the cast-in-place. Quantitative analysis revealed that the maximum reduction in yield load for the precast samples compared with that for the pier with a cast-in-place was only 4.68%, the reduction in peak load was less than 4.05%, the difference in initial stiffness was less than 7%, and the difference in energy dissipation capacity was less than 2.54%. However, the axial compression ratio (10%) significantly accelerated the rate of stiffness degradation by 62% and reduced ductility. The ductility of the pier with the grouted sleeve connection (µ = 3.0) was slightly superior to that of the pier with the grouted corrugated sleeve connection (µ = 2.7). The pier with the grouted sleeve connection exhibited a smaller residual displacement under large displacement angles and offered better reparability. This study provides direct, quantitative experimental evidence for the selection and optimization of connections in precast-assembled bridge piers.