Dynamic Response Simulation of Steel Bridges under Truck Loading

Fatigue-induced cracking is a common failure mode in many exiting steel bridges due to the increasing traffic volume and weight, deteriorating components as well as a large number of stress cycles. In recent years, many papers and reports discussed this topic have been published based on the analysis of an extensive database of weigh-in-motion (WIM) data collected at highway sites. An approach adopting the microscopic traffic flow simulation technique was proposed herein in order to simulate the real traffic load without weigh-in-motion data. A single span composite steel I-girder bridge was field monitored and numerically studied with the proposed analytical approach. The traffic flow on the bridge with three lanes was simulated by TSIS-CORSIM, a microscopic traffic simulation software. A 3D global finite element model of the bridge was established by CSiBridge, a bridge analysis software. Based on the simulated traffic flow, the dynamic responses such as displacement and stress-range of the bridge were studied. The results on top flanges, bottom flanges, and connection plates were compared as well. Meanwhile, the vehicle-bridge interaction was also studied by ANSYS, generalized FEM software with ADPL capability. This group analysis contains three related models: the bridge subjected to moving vehicle weights, the bridge subjected to dynamic vehicle systems, and vehicle-bridge interaction model considering road roughness. The results have been studied and compared in order to improve estimating the dynamic response, which may cause fatigue damage. Based on the information from field tests; simulated numerical analytical results were validated. Thus, the performance of welded steel bridges under truck load can be predicted in a more realistic way.

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