Confinement model for FRP confined normal- and high-strength concrete circular columns: Fid-Bau Portal

Confinement model for FRP confined normal- and high-strength concrete circular columns

Pham, Thong M. / Hadi, Muhammad N.S.

Highlights • A confinement model for FRP confined normal- and high-strength concrete is presented. • Effect of a new column parameter is introduced and discussed. • The proposed model is verified by an extensive database containing 574 specimens. • Specimens cover unconfined concrete strength between 15MPa and 170MPa. • Specimens are made of seven different types of FRP.

Abstract This study establishes a confinement model for FRP confined normal- and high-strength concrete circular columns. A new column parameter was suggested for estimating the compressive strength of FRP confined concrete. The proposed model is able to predict the ultimate condition of FRP confined concrete columns that have similar unconfined concrete strength and confining pressure but significant differences in the jacket stiffness. The proposed model was then verified using a database of 574 FRP confined concrete circular columns with different types of FRP. This database covers unconfined concrete strength between 15MPa and 170MPa and specimens with a diameter ranging from 51mm to 406mm. Furthermore, this database includes specimens with a variety of FRP types: carbon FRP (CFRP), glass FRP, high-modulus carbon FRP, aramid FRP (AFRP), CFRP tube, ultra-high-modulus CFRP tube, and AFRP tube. Finally, the model’s prediction fits the experimental results very well by verifying the proposed model with the extensive database.