Title:
Implications of ACI CODE-440.11 Code Provisions on Design of Glass Fiber-Reinforced Polymer-Reinforced Concrete Footings
Author(s):
Zahid Hussain and Antonio Nanni
Publication:
Structural Journal
Volume:
122
Issue:
1
Appears on pages(s):
143-152
Keywords:
building code; footing; glass fiber-reinforced polymer (GFRP) reinforcement; reinforced concrete; shear
DOI:
10.14359/51742142
Date:
1/1/2025
Abstract:
The first edition of ACI CODE-440.11 was published in September
2022, where some code provisions were either based on limited
research or only analytically developed. Therefore, some code
provisions, notably shear and development length in footings,
are difficult to implement. This study, through a design example,
aims at a better understanding of the implications of code provisions
in ACI CODE-440.11-22 and compares them with ones in
CSA S806-12, thereby highlighting a need for reconsiderations. An
example of the footing originally designed with steel reinforcement
was taken from the ACI Reinforced Concrete Design Handbook
and redesigned with GFRP reinforcement as per ACI CODE-
440.11-22 and CSA S806-12. A footing designed as per ACI CODE-
440.11-22 requires a thicker concrete cross section to satisfy shear
requirements; however, when designed as per CSA S806-12, the
required thickness becomes closer to that of the steel-reinforced
concrete (RC) footing. The development length required for a glass
fiber-reinforced polymer-reinforced concrete (GFRP-RC) cross
section designed as per ACI CODE-440.11-22 was 13% and 92%
greater than that designed as per CSA S806-12 and ACI 318-19,
respectively. Also, the reinforcement area required to meet detailing
requirements is 170% higher than that for steel-RC cross section.
Based on the outcomes of this study, there appears to be a need for
reconsideration of some code provisions in ACI CODE-440.11-22
to make GFRP reinforcement a viable option for RC members.