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<p>This study examines the performance of precast reinforced concrete (RC) column assemblies reinforced with glass fibre-reinforced polymers (GFRP). Four precast specimens, representing column-to-foundation/cap assemblies, along with one monolithic connection, were tested under cyclic loads. Three different construction materials were used, each with a distinct connection system, i.e. (1) conventional grouted corrugated duct connection (GCDC) using high-performance grout; (2) innovative non-contact lap splice connection filled with engineered cementitious composite (ECC); and (3) unbonded stainless steel bolts with different diameters. The cyclic performance of these columns was comprehensively analysed and compared. The results showed that precast GFRP-RC column assemblies can achieve a comparable capacity or greater than monolithic structures. Meanwhile, the failure mode, deformability, capacity, stiffness, and energy dissipation are influenced by the connection system. While the GCDC exhibited a gradual failure with a column flexural failure like the monolithic connection, it had the least initial stiffness and energy dissipation among the precast systems. Among the investigated systems, the ECC-filled pocket connection exhibited the highest overall energy dissipation and initial stiffness. Therefore, this type of connection can enhance the energy dissipation capacity of GFRP-RC structures, offering superior performance compared to monolithic structures and promoting the use of GFRP reinforcement in precast concrete for accelerated, durable construction.</p>

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Cyclic performance of precast GFRP-RC columns with innovative connection systems incorporating ECC and bolts

  • 期刊论文

  • 发表日期：

    2025年11月3日

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  • Mohamed H. El-Naqeeb,
  • Reza Hassanli,
  • Xing Ma,
  • Milad Bazli,
  • Allan Manalo,
  • Thong M. Pham

摘要

This study examines the performance of precast reinforced concrete (RC) column assemblies reinforced with glass fibre-reinforced polymers (GFRP). Four precast specimens, representing column-to-foundation/cap assemblies, along with one monolithic connection, were tested under cyclic loads. Three different construction materials were used, each with a distinct connection system, i.e. (1) conventional grouted corrugated duct connection (GCDC) using high-performance grout; (2) innovative non-contact lap splice connection filled with engineered cementitious composite (ECC); and (3) unbonded stainless steel bolts with different diameters. The cyclic performance of these columns was comprehensively analysed and compared. The results showed that precast GFRP-RC column assemblies can achieve a comparable capacity or greater than monolithic structures. Meanwhile, the failure mode, deformability, capacity, stiffness, and energy dissipation are influenced by the connection system. While the GCDC exhibited a gradual failure with a column flexural failure like the monolithic connection, it had the least initial stiffness and energy dissipation among the precast systems. Among the investigated systems, the ECC-filled pocket connection exhibited the highest overall energy dissipation and initial stiffness. Therefore, this type of connection can enhance the energy dissipation capacity of GFRP-RC structures, offering superior performance compared to monolithic structures and promoting the use of GFRP reinforcement in precast concrete for accelerated, durable construction.