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<p>Precast piers have been widely adopted worldwide due to their advantages in rapid construction, high quality, and minimal disruption to traffic and the environment. Building upon this concept, precast thin-walled hollow piers offer additional benefits, including further reductions in self-weight and construction costs. Nevertheless, corrosion remains a critical factor affecting the service life of bridge piers. However, current research on precast piers (particularly hollow precast piers) remains limited, especially concerning their durability under corrosive conditions. To study the difference of seismic behaviors between cast-in-place (CIP) and precast thin-walled hollow piers (PTP) under varying corrosion ratios, a total of five piers were tested cyclically after the accelerated corrosion. Although high-strength mortar was poured to connect the precast pier shaft and footing, the detection suggested that the corrosion ratio of rebars within the interface region was nearly 1.9 times that of the rebars within the shaft. Furthermore, the stirrups were corroded much faster than the flexural counterparts, which resulted in rapid loss of strength and ductility of core concrete. It was found that seismic-resistant capacity of PTP piers degraded faster than that of CIP counterparts when subject to moderate or high corrosion ratios. The peak load of PTP specimens with actual corrosion ratio of 8.6% and 15.4% decreased by 12.1% and 22.5% compared to the reference specimen, and the reduction was 20.2% for the CIP specimens. Finally, modeling strategies were developed in OpenSees, incorporating the bond-slip and inelastic buckling of rebar, and the mechanical property degradation of both cover and core concrete as well as corroded rebars. The results indicated that neglecting the inelastic compressive buckling of longitudinal reinforcement would prevent accurate simulation of the pinching effect observed in experiments. The proposed numerical model effectively reproduced the seismic performance of piers under different corrosion ratios.</p>

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A comprehensive study on the effects of chloride corrosion on hysteretic behaviors of thin-walled cast-in-place and precast hollow piers

  • 期刊论文

  • 发表日期：

    2026年3月9日

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  • Teng Tong,
  • Xuefeng Ren,
  • Jiateng Li,
  • Xiaobo Li,
  • Hao Wang,
  • Xu Wang

摘要

Precast piers have been widely adopted worldwide due to their advantages in rapid construction, high quality, and minimal disruption to traffic and the environment. Building upon this concept, precast thin-walled hollow piers offer additional benefits, including further reductions in self-weight and construction costs. Nevertheless, corrosion remains a critical factor affecting the service life of bridge piers. However, current research on precast piers (particularly hollow precast piers) remains limited, especially concerning their durability under corrosive conditions. To study the difference of seismic behaviors between cast-in-place (CIP) and precast thin-walled hollow piers (PTP) under varying corrosion ratios, a total of five piers were tested cyclically after the accelerated corrosion. Although high-strength mortar was poured to connect the precast pier shaft and footing, the detection suggested that the corrosion ratio of rebars within the interface region was nearly 1.9 times that of the rebars within the shaft. Furthermore, the stirrups were corroded much faster than the flexural counterparts, which resulted in rapid loss of strength and ductility of core concrete. It was found that seismic-resistant capacity of PTP piers degraded faster than that of CIP counterparts when subject to moderate or high corrosion ratios. The peak load of PTP specimens with actual corrosion ratio of 8.6% and 15.4% decreased by 12.1% and 22.5% compared to the reference specimen, and the reduction was 20.2% for the CIP specimens. Finally, modeling strategies were developed in OpenSees, incorporating the bond-slip and inelastic buckling of rebar, and the mechanical property degradation of both cover and core concrete as well as corroded rebars. The results indicated that neglecting the inelastic compressive buckling of longitudinal reinforcement would prevent accurate simulation of the pinching effect observed in experiments. The proposed numerical model effectively reproduced the seismic performance of piers under different corrosion ratios.