Detection of slip for CFRP-concrete interface using stereovision method corrected by epipolar constraint

Abstract

The bond-slip relationship for the interface between concrete and carbon fiber reinforced polymer (CFRP) has become a hot research topic. Aimed at the disadvantage of traditional measurement approaches, a stereovision method corrected by epipolar constraint is proposed to measure slip curves of CFRPconcrete interface in the present paper. The proposed stereovision measurement method employs the epipolar constraint to correct digital image correlation (DIC) matching result. The nearest point located on the right epipolar line to DIC matching result is chosen as the new matching point on the right image. Furthermore, this correction method is extended to the sequential matching of right images. The precision comparison test and the detection test of slip for CFRP-concrete interface are performed on the universal testing machine. Results of the precision comparison test show that the proposed stereovision method can improve the measurement accuracy. Experimental results of slip detection of CFRP-concrete interface show that the displacement curves obtained by the proposed stereovision method are in good agreement with that of the linear variable differential transformer (LVDT); this manifests the effectiveness and reliability of the proposed stereovision method, indicating that the proposed stereovision method can be used to measure the entire slip curves of CFRP-concrete interface.

Cracking and Fiber Debonding Identification of Concrete Deep Beams Reinforced with C-FRP Ropes against Shear Using a Real-Time Monitoring System

“…Although it is widely accepted, the application of strain gauges suffers from some limitations due to the a priori assumption of the uniform strain field, which practically recanted when cracking occurred [ 52 ]. In addition, strain gauges are locally limited, while PZT transducers can act in a wide spatial region.…”

Interfacial bond-slip relationship between Carbon Fiber Reinforced Polymer Plate and Concrete after High Temperature of Asphalt Paving Construction

“…Studies have shown that the failure modes of CFRP-reinforced structures are often manifested as various types of debonding failure of CFRP-concrete interface (Zhang et al, 2017;Zeng et al, 2018;Rukavina et al, 2019). The ability to resist the deformation of FRP and concrete depends on the good bonding properties between CFRP and concrete (Yazdani et al, 2019;Wanga and Petrů, 2019;Shan et al, 2018;Li et al, 2018). Resaerch on the bond-slip relationship of CFRP-concrete interface is considered to be an in-depth study of CFRP strengthen methods applied to bridge (Yuan et al, 2019;Alhassan et al, 2019).…”