Published: Građevinar 76 (2024) 11
Paper type: Scientific research paper
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Fatigue characterisation of concrete composite girder with steel bottom plate and corrugated web under uniform corrosion environment

To provide clarification on the fatigue characteristics of concrete composite beams that have steel base plates and corrugated webs and are exposed to uniform corrosion. Adding a corrosion rate parameter to the equation to calculate the moment of inertia. Calculated the stress amplitude in concrete composite beams that have a steel base plate and corrugated web and are subjected to uniform corrosion. Utilizing Paris' semi-empirical law and Lemaitre's calculation of fatigue life, Uniform corrosion is used to analyze the calculation of S-N curves for concrete composite beams with corrugated webs on steel base plates. Through model testing and numerical simulations, it was proven that the Lemaitre parameters of these box girders were determined using the fatigue life calculation Equations. By employing a numerical fitting method, Analyzing the connection between stress amplitude, fatigue life, and corrosion rate when the corrosion rate is less than 20%. Curvatures for stress amplitude, fatigue life, and corrosion rate were gathered. The outcomes demonstrate: Salt-corrosive environments have a significant impact on the fatigue characteristics of composite beams. Increases the stress amplitude at the same level of loading and decreases the fatigue life at the same level of loading. At a corrosion rate of 9%, the stresses in the test beams increased by 10% and the fatigue life decreased by 24.48%; When the corrosion rate is less than 20%, the stress amplitude increases essentially linearly with the increase in corrosion rate, and the fatigue life decreases essentially linearly with the increase in corrosion rate.

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