Mesoscale modelling of bond failure behaviour of ribbed steel bar and concrete interface

Mengjia Liu,Xiuli Du,Renbo Zhang,Liu Jin,R Ruan

doi:10.1051/e3sconf/202127202003

Abstract

To explore the nonlinear bond behaviour between ribbed bar and concrete, combined with the characteristics of concrete meso-structure and ribbed bar surface characteristics and considering frictional resistance and the mechanical interlocking between rebar and concrete, a meso-scale model is established. Based on the good agreement between the simulation results and experimental results, the failure mechanism of bond between rebar and concrete is discussed, and the distribution characteristics of bond stress of steel bar are analysed. Furthermore, based on the meso numerical analysis method, the influence of friction coefficient between rebar and concrete on the failure mode of concrete and bond stress-slip curve was discussed, and the proportion of friction component in bond strength is obtained.

Highlights

Sufficient bond strength between rebar and surrounding concrete to transfer the stress and coordinated deformation between them is the basis of its good working performance, and it is the premise for the joint work of rebar and concrete [1,2]
A large number of physical tests [3,4,5,6] systematically reveal the relevant parameters for interfacial adhesion and provide the basic parameters for the construction of the interface bond-slip nonlinear constitutive model
Wang et al [8] based on Xu [6, 9] simplified deformed steel twodimensional simplified geometric model, deduced and obtained the quantitative relationship of bond strength between steel and concrete interfaces; Melo et al [3] proposed a polynomial expression of the steel-concrete bond-slip constitutive relation based on fitting analysis of its experimental data

Summary

Introduction

Sufficient bond strength between rebar and surrounding concrete to transfer the stress and coordinated deformation between them is the basis of its good working performance, and it is the premise for the joint work of rebar and concrete [1,2]. Wang et al [8] based on Xu [6, 9] simplified deformed steel twodimensional simplified geometric model, deduced and obtained the quantitative relationship of bond strength between steel and concrete interfaces; Melo et al [3] proposed a polynomial expression of the steel-concrete bond-slip constitutive relation based on fitting analysis of its experimental data. These bond-slip constitutive models provide the basis for the design and numerical simulation of reinforced concrete structures. The proportion of friction component in bond strength was discussed

Meso-scale computational geometry model

Numerical analysis model verification

Conclusions