Shear Design Considering Interaction between Steel Stirrups and Carbon Fiber-Reinforced Polymer Strips

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Title: Shear Design Considering Interaction between Steel Stirrups and Carbon Fiber-Reinforced Polymer Strips

Author(s): Yungon Kim, Wassim M. Ghannoum, and James O. Jirsa

Publication: Structural Journal

Volume: 114

Issue: 04

Appears on pages(s): 803-813

Keywords: carbon fiber-reinforced polymer (CFRP); interaction of steel and CFRP; modification factors; shear design; strengthening

Date: 7/1/2017

Abstract:
Conventional shear-strength relations provide conservative estimates for the design strength of new members. However, when members are strengthened with carbon fiber-reinforced polymer (CFRP) vertical strips, the traditional approach of independently summing the concrete, steel, and CFRP contributions to shear strength was found to overestimate the strength increase due to the CFRP material. Thus, modification factors ksF and kfS are proposed to modify the shear-strength equations in ACI 440.2R and account for the interaction between steel and CFRP transverse reinforcement. The proposed factors provide more accurate and less conservative estimates of shear strength of concrete beams, with improved estimates of the strength increase when CFRP materials are added.