Dynamic performance-based assessment for tied-arch bridges subjected to heavy multi-axial tractor-trailers

With rapid industrial development, the overloading of bridges caused by heavy multi-axle vehicles has become a critical problem worldwide. This work conducts performance-based evaluation for tied-arch subjected to vehicles, and prediction function dynamic impact factor (DIF) is proposed considering bridge frequency, vehicle speeds, road quality level. Specifically, main parameters affecting response were first identified theoretically using simplified vehicle-bridge model. A tractor-trailer mechanical model subsequently constructed coupled displacement coordination conditions explore characteristics under tractor-trailers. Additionally, based on factors, detailed investigation DIF was performed developed special interaction Finally, suggested computational method predicting proposed. The results obtained indicate effect tractor-trailers should not be ignored, even at low operating speeds in good conditions. Moreover, additional monitoring measures placed structural components that are sensitive responses regulate within an acceptable range.