Vibration Comfort Analysis of Curved Steel Box Girder Pedestrian Bridges
Compared to single-span pedestrian bridges,curved continuous beam pedestrian bridges exhibit more complex geometric and structural dynamic characteristics,which can lead to comfort issues.Currently,there are few vibration response calculation methods specifically addressing curved beam pedestrian bridges in domestic and international standards.This study aims to discuss the applicability of existing calculation methods for evaluating the comfort of curved multi-span bridges by drawing on typical design specifications for pedestrian bridge comfort from both domestic and international sources.Taking the steel box girder curved pedestrian bridge as an example,the finite element model was calibrated based on measured results.The comfort evaluation results of the pedestrian bridge were compared against the specifications,and the finite element results were validated using a simplified single-degree-of-freedom method.The results indicate that under traffic level limitations lower than TC5,the pedestrian bridge can generally meet the comfort requirements.Due to the dense distribution of higher-order natural frequencies in multi-span curved pedestrian bridges,the influence of high-frequency resonance caused by the second component of pedestrian load should be considered in comfort design.
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