Seismic Design Guideline for Hybrid GFRP-Steel RC Bridge Pier Considering Performance-Based Design

Osman S. M. S., Aldabagh S., Alam M. S., Sheikh S. A.

10th International Conference on Fibre-Reinforced Polymer (FRP) Composites in Civil Engineering (CICE), İstanbul, Turkey, 8 - 10 December 2021, vol.198, pp.1005-1019 identifier identifier

  • Publication Type: Conference Paper / Full Text
  • Volume: 198
  • Doi Number: 10.1007/978-3-030-88166-5_88
  • City: İstanbul
  • Country: Turkey
  • Page Numbers: pp.1005-1019
  • Keywords: Hybrid reinforcement, Hybrid bridge piers, Performance-based design, FRAGILITY, COLUMNS, STATE, BARS
  • Istanbul Technical University Affiliated: No


Glass Fiber Reinforced Polymer (GFRP) bars have been introduced in reinforced concrete (RC) structures to improve their performance against steel corrosion. However, the brittle failure, with no ductility provided of GFRP reinforcing bars is the main challenge limiting their use in many regions of high seismic activity. Especially in the critical sections, such as plastic hinge regions of a column. In this study, GFRP bars are used in conjunction with steel bars that are well-known for their ductile behavior, thus creating a hybrid section. The hybrid section includes exterior GFRP bars and interior steel bars. Two layers of transverse reinforcements, either made from GFRP (external cage) or steel (internal cage), are also provided. The prescribed hybrid section is one potential alternative to mitigate corrosion of steel reinforcement while maintaining adequate stiffness and ductility in the structure. In addition to the experimental work, the seismic behavior of hybrid sections is numerically investigated using validated fibre-based models. After model validation, a nonlinear incremental dynamic analysis will be performed to establish performance-based damage states, which are later utilized in the seismic fragility-based assessment of a bridge pier located in Vancouver, British Columbia. The damage states (i.e. minor, moderate, major, and local collapse) and the corresponding performance criteria (material strain and the associated drift values) are presented for the hybrid section.