Abstract
Based on analyzing the bearing capacity of existing T-beam bridges in service, the factors that affect the T-beams cracked by chloride ions mainly include the width and the depth of cracks. Combined with practical engineering examples, a single-piece T-beam model is established to explore the influence of factors such as crack width and crack depth on the T-beams affected by chloride ion erosion through numerical simulation in this paper. In addition, the attenuation models of bending capacity and shear capacity of the T-beam are obtained to analyze the possible failure modes of T-beams with cracks. All of which provides a reference for exploring the effect of crack width and depth on the durability of reinforced concrete members under chloride ion field.
Highlights
By the end of 2018, the total number of highway bridges in China exceeded 800,000, and the total number of railway bridges exceeded 200,000
Studies have shown that the corrosion of steel bars by chloride ions is one of the significant factors weakening the bearing capacity of T-beams
In order to explore the influence of chloride ion on the flexural and shear capacity of T-beams with cracks, Zhao Xiyu et al [11,12] assumed concrete to be a semi-infinite medium, and analyzed its corrosion pattern through physical model tests, and obtained the diffusion law of chloride ions in concrete and the shear capacity attenuation law of steel bars
Summary
By the end of 2018, the total number of highway bridges in China exceeded 800,000, and the total number of railway bridges exceeded 200,000. Due to the key factors affecting the bridge bearing capacity, such as increased traffic, larger vehicle loads, and adverse surrounding environmental factors, corrosion and damage of reinforced concrete structures in coastal and offshore areas are serious. Studies have shown that the corrosion of steel bars by chloride ions is one of the significant factors weakening the bearing capacity of T-beams. In order to explore the influence of chloride ion on the flexural and shear capacity of T-beams with cracks, Zhao Xiyu et al [11,12] assumed concrete to be a semi-infinite medium, and analyzed its corrosion pattern through physical model tests, and obtained the diffusion law of chloride ions in concrete and the shear capacity attenuation law of steel bars. T-beam, besides, evolution law of bending and shear capacity over time can be obtained
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