Title:
Evaluation of Deflection Calculation for Hybrid-Reinforced Concrete with Fiber-Reinforced Polymer and Steel Bars
Author(s):
Shui Liu, Xin Wang, Yahia M. S. Ali, Huang Huang, and Zhishen Wu
Publication:
Structural Journal
Volume:
121
Issue:
4
Appears on pages(s):
213-223
Keywords:
database; deflection; effective moment of inertia; fiberreinforced polymer (FRP) bar; hybrid reinforcement
DOI:
10.14359/51740717
Date:
7/1/2024
Abstract:
This study presents a critical evaluation of the deflection calculation
for hybrid-reinforced concrete (hybrid-RC) with fiber-reinforced
polymer (FRP) and steel bars by employing existing expressions
for the effective moment of inertia Ie. A new rational and simple
approach is proposed to account for concrete shrinkage restraint
caused by both steel and FRP bars and modify the existing reduction
factors in the expressions from ACI 318-19 and ACI CODE-
440.11-22. The calculated deflections by the modified expressions,
as well as Branson’s equation and the method specified in CSA
S806-12, are compared with the experimental values from a database including 119 hybrid-RC members. The comparisons indicate that the modified expression from ACI 318-19 provides the most accurate deflection predictions. Moreover, the modified expression from ACI CODE-440.11-22, which further includes the consideration of varied stiffness along the member span, proves to be particularly effective for cases with relatively lower reinforcement
ratios.