Abstract
Corrosion of steel reinforcement is the main damage issue for the efficiency and performance of reinforced concrete (RC) bridge piers located in aggressive environments. In this study, the possibility of strengthening corroded RC bridge piers with high corrosion leveled by ultra-high performance fiber RC (UHPFRC) jacketing was investigated numerically. The model of nonlinear 3-D finite-element (FE) was constructed by using ANSYS software. The parameters of axial force ratio, longitudinal reinforcement ratio, aspect ratio, and transverse reinforcement ratio were studied to determine their effect on the lateral load resistance of strengthening corroded RC bridge piers. The verification carried out between the constructed FE and the experimental results of ten RC bridge piers in four experimental studies. The performance of RC bridge piers under cyclic lateral displacement and axial force was studied with different ratios. Finally, a practical model to calculate the lateral load resistance of corroded RC bridge piers was proposed. The results of this research suggest that this technique could be applied for existing concrete bridge exposed in the marine environment whereas, the concentration of corrosive chlorides are high and can also use for any shape of a column and this technique allows keeping the initial dimension of the column.
Highlights
Research has been recently carried out to explain the nature of corrosion and its mechanisms
Effect of Corrosion Level The effect of corrosion level on the lateral load resistance for reinforced concrete (RC) bridge piers with aspect ratio 3.25 and 6.50 and compressive strength 25 MPa was shown in Table 3 and in Figure 12 for aspect ratio 3.25 by dividing the values of Vp corroded to the values of Vp uncorroded (Vpcorr/ Vpun)
For example in the pier with an axial force ratio 10%, aspect ratio 3.25 and longitudinal reinforcement 2.01%, when the corrosion level was increased from 0% to 40% and 40.0% with strengthening (i.e. 40 STR), the lateral load resistance was reduced by 50.4% and was increased by 73.20% respectively, and mode of failure was changed from flexure failure to local buckling and flexure shear failure respectively
Summary
Research has been recently carried out to explain the nature of corrosion and its mechanisms. Akkaya carried out the lateral cyclic loading test on 13 rectangular RC columns divided into three groups to study the seismic behavior of columns reinforced with plain and deformed bars under the influence of corrosion [2]. Ma et al conducted cyclic loading tests on 13 circular RC columns under different rates of corrosion and axial compressive loads [3]. They indicated that high levels of corrosion and high axial loads led to the brittle failure of the column and cause stiffness, ductility, energy dissipation reduction poor hysteric response. Ran et al investigated experimentally the behavior of strengthened corroded reinforce concrete columns by using carbon – fabric reinforced cementitious matrix (C-FRCM) under cyclic
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