Behaviors of Large-Rupture-Strain Fiber-Reinforced Polymer Strengthened Reinforced Concrete Beams Under Static and Impact Loads

Zenghui Ye,Lili Sui,Xiaoqing Zhou,Debo Zhao,Zhenyu Huang

doi:10.3389/fmats.2020.578749

Abstract

Reinforced concrete (RC) structures may be damaged seriously when subjected to impact loading, and it is necessary to strengthen existing structures to improve their impact resistance. Large-rupture-strain FRP (LRS-FRP) is a promising material to strengthen RC structures under impact because of its good deformation capacity. The paper conducted experimental studies on performances of LRS-FRP strengthened RC beams under static and impact loads. The influences of FRP types, impact weight and velocity, and whether applying end anchorages on the strengthening efficiency were investigated. The end anchorage LRS-FRP strengthening system reduced the maximum deflection and damage of strengthened beam significantly. However, the end anchorage was more susceptible to damage and failure under impact. Therefore, the end anchorage and the EA-FRP connection should be designed with caution for impact condition.

Highlights

Fiber-reinforced polymer (FRP) is widely accepted as an excellent material in structural strengthening and retrofitting because of its high strength-to-weight ratio, good corrosion resistance, and ease of installation (Teng et al, 2002, Teng et al, 2012; Baji et al, 2016; Nie et al, 2020; Zhou et al, 2020a)
A great number of studies show that FRP strengthening can effectively enhance the bearing capacity and stiffness of Reinforced concrete (RC) beams (Bencardino et al, 2005; Bencardino et al, 2006; Oller et al, 2019; Benzeguir et al, 2020; Sayed, 2020), and detailed procedures have been established to guide the design of FRP strengthened
The results presented here can provide references for evaluation and improvement of the anti-impact performance of Large-rupture-strain fiber-reinforced polymer (LRS-FRP) strengthened RC structures

Summary

Introduction

Fiber-reinforced polymer (FRP) is widely accepted as an excellent material in structural strengthening and retrofitting because of its high strength-to-weight ratio, good corrosion resistance, and ease of installation (Teng et al, 2002, Teng et al, 2012; Baji et al, 2016; Nie et al, 2020; Zhou et al, 2020a). Many studies (Bencardino et al, 2005; Bencardino et al, 2006; Dai et al, 2009; Kalfat and Al-Mahaidi, 2011; Zhou et al, 2017; Zhou et al, 2018; ) show that applying additional mechanical anchors on the EB-FRP laminate can improve the collaboration ability of the FRP strengthening system with the RC beam greatly, and inhibits or prevents the failure induced by FRP debonding.

Methods

Results

Conclusion