Title: Effect of Fiber-Reinforced Polymer-Compression Reinforcement in Columns Subjected to Concentric and Eccentric Loading
Author(s): Ahmad N. Tarawneh, Hazim M. Dwairi, Ghassan S. Almasabha, and Sereen A. Majdalaweyh
Publication: Structural Journal
Appears on pages(s): 187-197
Keywords: compressive contribution; compression controlled; deterioration; fiber-reinforced polymer (FRP)-reinforced; reinforced concrete columns
Current design codes such as ACI 440.1R-15 and Canadian Code CSA S806 do not include provisions to the use of fiber-reinforced polymer (FRP) bars to resist compressive stresses. Rather, these codes specify not to include the compressive contribution of FRP in the axial or flexural capacity of the members. The use of FRP bars as longitudinal and transverse reinforcement in axially loaded members has been investigated in the past years. However, there are no solid conclusions reached out on how to account for the compression contribution of FRP reinforcement in columns. To study the compression contribution of FRP bars, a statistical analysis of 194 tests of compression members reinforced with GFRP and CFRP bars was carried out thoroughly. The investigated experimental database comprised of concentrically and eccentrically loaded rectangular and circular columns. Eight approaches accounting for FRP reinforcement in compression members were evaluated in the analysis and compared to the 194 tests’ results. This study shows that ignoring the compression contribution of FRP underestimates the column capacity by 15% for concentrically loaded, 8% for eccentrically loaded rectangular columns, and 5% for eccentrically loaded circular columns. Based on the statistical analysis, accounting for the FRP compression bars in the capacity of FRP-reinforced concrete columns by limiting the FRP strain to 0.002 yielded the best fit to the experimental data.