Abstract
The coupling effects of welding residual stress (WRS), vehicle load and speed are investigated. The microhardness test was conducted to evaluate the WRS. The transient analysis-based model was developed to investigate the dynamic stress responses. A simplified evaluating procedure was proposed to enable analysis of coupling effects. The results show that the measured WRS at weld toe and root is 119 and 125 MPa. The stress amplitude increases linearly and exponentially with the loading magnitude and frequency. As the fatigue damages increases with the axle weight and speed, the speed of heavy trucks should also be limited in real-world bridges.
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