Title: ESTABLISHING THE SHEAR CONSTITUTIVE LAWS OF FRP-STRENGTHENED RC MEMBERS

Author(s): Mehdi Zomorodian and Abdeldjelil Belarbi

Publication: Symposium Paper

Volume: 328

Issue:

Appears on pages(s): 13.1-13.22

Keywords: Constitutive modeling; FRP strengthened RC members; Shear behavior; truss model

DOI: 10.14359/51711157

Date: 9/12/2018

Abstract:
The behavior of FRP strengthened RC members has not been fully clarified due to lack of accurate constitutive laws for the components of the members. This paper presents experimental and analytical investigations of parameters that affect the various material laws of FRP strengthened RC elements. The material laws of concrete in tension, steel in tension, FRP in tension, softening coefficient, and modified Hsu/Zhu ratios were further developed in this research. To study the behavior and the main affecting parameters of FRP strengthened RC members subjected to shear, experimental tests of panels subjected to pure shear stress fields were conducted. The main variables investigated are steel reinforcement ratio, FRP reinforcement ratio and wrapping schemes of FRP sheets. The results show that the tensile behavior of the concrete and steel is altered because of the externally bonded FRP sheets. Also, the softening coefficient and the Hsu-Zhu ratios for FRP-strengthened RC vary greatly compared to RC elements without FRP reinforcement. Modified constitutive laws are proposed and incorporated in the Softened Membrane Model (SMM) to demonstrate the behavior of FRP-strengthened RC element subjected to pure shear. The newly developed analytical model is referred to as the Softened Membrane Model for FRP strengthened RC members (SMM-FRP).