This research delves into the dynamic interaction between bipedal pedestrians and truss structures, utilizing the Lagrangian equation theory to formulate the governing equations of the pedestrian-truss system. This advanced theoretical approach effectively accounts for the dynamic properties of the human body and their consequential effects on the structural dynamics. A comprehensive numerical analysis was conducted on a 22.4-m truss structure, revealing that the proposed methodology produces results that are consistent with those obtained from finite element analysis. The findings demonstrate that consistent numerical solutions were achieved, the significant influence of pedestrian movement on the structure’s dominant natural frequencies and damping characteristics, and how human body model parameters alter under specific gait conditions. The versatility of this theory is highlighted by its potential application not only to horizontal truss bridges but also to cantilever and arch truss configurations, thereby underscoring its substantial relevance and transformative potential for real-world engineering projects.
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