Shear behavior of concrete beams pre-stressed with carbon fiber reinforced polymer tendons

Zuohu Wang,Weizhang Liao,Yuan Yao,Du Liu,Yuqiang Cui

doi:10.1177/1687814018816879

Abstract

This article presents experimental and numerical studies on the shear behavior of reinforced concrete beams pre-stressed with carbon fiber reinforced polymer tendons. A total of 23 beams were tested to analyze the failure mode and shear performance of pre-stressed concrete beams. Experimental results revealed that there were two typical shear failure modes, that is, shear compression failure and inclined compression failure. Next, the experimental and numerical results were used to explore factors influencing the failure mode and the shear behavior of the concrete beams, including the type of pre-stressing tendons, stirrup ratio, shear span–depth ratio, number of pre-stressing tendons, and their initial pretension levels. It is demonstrated that shear span–depth ratio and stirrup ratio are the two main determinants of the failure mode and shear capacity of the concrete beams pre-stressed with carbon fiber reinforced polymer tendons. However, the bonding conditions of the pre-stressing carbon fiber reinforced polymer tendons have no significant effect on the shear capacity of the pre-stressed concrete beam.

Highlights

Fiber reinforced polymer (FRP) tendons can be substituted for steel reinforcements or pre-stressing cables in engineering projects and have been extensively studied
The results show that the shear capacity of the concrete beams pre-stressed with carbon fiber reinforced polymer (CFRP) tendons increases with the increase in the pre-stressing force, and the rate of increase changes with different pre-stressing forces
A total of 23 concrete beams were tested to investigate the shear behavior of concrete beams pre-stressed with CFRP tendons

Summary

Introduction

Fiber reinforced polymer (FRP) tendons can be substituted for steel reinforcements or pre-stressing cables in engineering projects and have been extensively studied. The tests showed that premature failure is likely to occur in FRP pre-stressed concrete beams due to shear tendon rupture, which results in reduced ultimate capacity. To predict the complex shear behavior of concrete beams, refined analytical and numerical models have been developed.[10] the shear capacity of prestressed concrete beams with FRP tendons is still an open topic; there is no universally accepted simplified design formulation. Attempts to achieve such a formulation have been made by some researchers. The failure modes and effects of various factors such as type of pre-stressing tendons, stirrup ratio, shear span–depth ratio, number of pre-stressing tendons, and pre-stressing levels on the shear performance of pre-stressed concrete beams with CFRP tendons were investigated in detail through experimental and numerical investigations

Design of the specimens

Findings

Conclusion