Sensitivity of Concrete Girder Bridge Dynamic Behaviors on Durability Index

Abstract:

According to frequency of vibration and vibration mode function of simply supported beam, the reliability functional function was established based on monitoring information. The reliability sensibility analysis method was used to study the influence of materials parameters and cross section geometry parameters on frequency of vibration. Theoretical analysis shows that the sensitivity of frequency of vibration on the reinforcement elastic modulus is lower than that on the concrete elastic modulus. The sensitivity of frequency of vibration on the moment of inertia of cross section of concrete is lower than that on the moment of inertia of cross section of reinforcement. The numerical example demonstrates that the sensitivity of frequency of vibration on the reinforcement corrosion is higher than that on the mid span damage. When the reinforcement corrosion degree and the damage severity are 5%, 10%, 15% and 20% respectively, the reinforcement corrosion caused by the first order frequency of vibration variation rate are 1.94 times, 1.85 times, 1.80 times and 1.74 times as much as that caused by mid span damage of the first order frequency of vibration variation rate.