Experimental Study on Bearing Capacity of Corroded Reinforced Concrete Arch Considering Material Degradation

Jingzhou Xin,Jieyun Wang,Zengwu Liu,Jianting Zhou,Xing You

doi:10.3389/fmats.2022.847193

Jingzhou Xin, Jieyun Wang + Show 3 more

Open Access

https://doi.org/10.3389/fmats.2022.847193

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Abstract

To study the bearing capacity of a corroded reinforced concrete (RC) arch and analyze the deterioration mechanism of an in-service RC arch bridge, a deterioration simulation under the coupling effect of the environment and load was performed by employing non-immersion energization, and considering the dead load on the arch, single point loading tests of the arch models were carried out; the crack development, structural deformation, and ultimate bearing capacity of a corroded RC arch under service stress were studied; the failure mode of the corroded arch was explored; and a bearing capacity prediction model considering dual deterioration effects of reinforcement corrosion deterioration and arch axis deterioration was established. Results indicated that the spacing of cracks caused by a load on the non-corroded arch was more uniform, and the number and distribution range of load-induced cracks in the corroded arch was smaller, while the maximum crack width was larger. Corrosion significantly reduced the strength of the arch rib; for the deteriorated arch with a corrosion rate of 7.62%, the cracking load and the bearing capacity decreased by 28.57 and 9.84%, respectively. Corrosion weakened structural stiffness, while it does not convert the failure mode of the arch. Only considering section resistance degradation may underestimate the damaging effects of corrosion on the arch structure.

Highlights

Reinforced concrete (RC) arch bridges are widely used in China, especially in mountainous areas, because of their high structural stiffness, beautiful appearance, and economy advantage (Deng et al, 2019; Li et al, 2021)
The percentage gravimetric mass loss of steel could be calculated by the following equation: ηs m0 − mc m0
Experimental Study of Corroded Arch corrosion rate of the steel on the extrados was generally higher than that on the soffit. This phenomenon shows that there is a strong correlation between the corrosion rate of reinforcement and the concentration of chloride ion solution

Summary

INTRODUCTION

Reinforced concrete (RC) arch bridges are widely used in China, especially in mountainous areas, because of their high structural stiffness, beautiful appearance, and economy advantage (Deng et al, 2019; Li et al, 2021). Compared with the previous corrosion scheme, the advantages of this scheme could be summarized as follows: first, the corrosion process was carried out under conditions similar to the stress state of real bridges; second, the corrosion products were easy to be brought out by the solution during immersion accelerated corrosion, which reduced the damage of the corrosion products to the structure, and the non-immersion method adopted in this study evaded this issue; it does not require a large electrolytic cell, and the corrosion of large components is easier to achieve. The load-induced transverse cracks and corrosioninduced longitudinal cracks mapping were monitored by using a crack width observation instrument with an accuracy of 0.01 mm

RESULTS AND DISCUSSION

CONCLUSION

DATA AVAILABILITY STATEMENT