Remaining Service Life of a 96 Year Old Riveted Truss Bridge

摘要

This paper is going to present a combined approach with the conventional fatigue analysis and the fracture mechanics based concept with Zhejiang Street Bridge as an example. Firstly, a 3D-FEM is established through comparing the calculated results with experiments. Secondly, the stress spectrum is calculated based on the traffic data investigation and Monte-Carlo simulation. The traffic load spectrum is derived by comparison of measurement of stress spectrum with the calculated. Thirdly, the fatigue life is calculated based on the S-N curve. With the service factor calculated an inspection priority is determined. Fourthly, the initial crack size is assumed through ultrasonic detection. With the simplified fracture mechanics model -CCT, the critical crack size and failure mode are analyzed. The remaining fatigue life is calculated through the simulation of crack growth, and the inspection interval and maintenance strategy are determined.