Dynamic Behavior of Truss Bridge Structures Due to Moving Load

The increasing number of bridge collapses and the high percentage of structural aging have raised awareness among experts about the significance of inspecting and mitigating damages in structures due to influencing factors. As time progresses, the increasing vehicle loads have become a concern for experts when examining existing bridge. Therefore, inspections are conducted on both existing and new truss bridges using dynamic field testing methods. This research aims to analyze the impact of moving loads on truss bridge structures. Moving loads will be defined as trucks traversing the truss bridges. Failure to consider the effect of moving trucks as dynamic loads in structural design can lead to the failure of truss bridges. This testing is carried out on truss bridges to understand their dynamic responses to moving loads. In this study, dynamic response testing is performed using finite element software with truck loading according to the SNI 1725–2016 standard. This analysis is conducted dynamically, resulting in both vertical and horizontal reactions in the truss bridge structure due to the moving truck load. Furthermore, natural frequency values and mode shapes of the structure due to the moving load are tested. For the first mode, the response to vibration excitation caused by the moving load on the truss bridge structure is dominated by horizontal direction with a vertical frequency of 2.23 Hz. The natural frequency value of the truss bridge meets the user comfort standards. This research is expected to provide a better understanding of the dynamic behavior of truss bridge structures.