Behavioral characteristics of RC beams with non-uniform corrosion along the reinforcement

Abstract

Keywordsnon-uniform corrosion reinforced concrete (RC) beams corrosion model spatial variability factor (R') diameter-loss measurement mass-loss measurementThis study investigated the behavior of a non-corroded reinforced concrete (RC) beam and two RC beams with non-uniform corrosion (whole span and side span) in a four-point bending test. The corrosion distributions of the tensile steel rebars were measured by two methods: diameter loss and mass loss. The peak values of corrosion distribution in the diameter-loss measurements were much greater than those in the mass-loss measurements. However, the average corrosion according to the diameter measurements was smaller than that in the mass-loss measurements. The corrosion distribution trends were the same in the two methods, indicating good measurement accuracy. From the bending test results, it appears that increasing corrosion area and corrosion ratios reduce the beams' stiffness, yielding capacity, and ultimate capacity. All three specimens had similar failure patterns: steel yielding followed by compression failure of the concrete. A nonlinear three-dimensional (3D) analysis model that considered the non-uniform corrosion of the rebars was established and verified by experimental data. The model's predictions for stiffness, ultimate capacity, and failure patterns were consistent with experimental results. The spatial variability factor (R'), which is the ratio of the maximum corrosion ratio (γ max ) to the average corrosion ratio (γ ave ), was adopted to quantify the nonuniformity of the corrosion distribution in this study.

Behavior of Concrete-Filled Steel Tube Columns with Multiple Chambers and Round-Ended Cross-Sections under Axial Loading

“…The equation denoted by Equation (11), incorporating the confinement effect exerted by a multi-chamber steel tube on the core concrete, is utilized to estimate the ultimate bearing capacity of M-CFRT stub columns. Moreover, it is applicable for predicting the ultimate carrying capacity of circular CFT stub columns, as expressed in Equation (10), namely, M-CFRT stub columns with B/D = 1.…”

“…In actual engineering, the axial compression performance is a key property for structures. To date, numerous experimental and finite element analysis (FEA) research have been conducted on the property of CFT stub columns or other structures under axial compression, and the research provided ideas for this study [9][10][11][12][13][14][15][16][17].…”

“…In addition, Wang et al [20] and Ding et al [21] conducted a numerical investigation on the compressive properties of CFRT stub columns and proposed a novel method, which involves the welding of bidi- In actual engineering, the axial compression performance is a key property for structures. To date, numerous experimental and finite element analysis (FEA) research have been conducted on the property of CFT stub columns or other structures under axial compression, and the research provided ideas for this study [9][10][11][12][13][14][15][16][17].…”

Application of high-performance cementitious composites in steel–concrete composite bridge deck systems: A review

“…Subsequently, the longitudinal and transversal flexural performances of the orthotropic steel-concrete CBD system were investigated, indicating a good bearing capacity and stiffness [12,13]. Nevertheless, the concrete slab is also easy to crack under vehicle loads, especially in the hogging moment region, which will introduce steel corrosion and other adverse phenomena [14][15][16][17]. Thus, special attention was paid to the enhancement measures regarding the crack resistance of steel-concrete CBD structure including using fiber reinforce plastic (FRP) and FRP bars [18].…”

“…Fig 16. Durability of UHPC compared with HPC and conventional concrete, reproduced with permission from Ref [91],.…”