考虑人行桥纵坡的人-桥耦合振动理论分析与试验验证OA

Pedestrian bridges are often constructed with longitudinal slopes to meet the needs of drainage,topography and cycling.However,when pedestrians walk on the pedestrian bridges with longitudinal slopes,the human gravitational po-tential energy will release,resulting in the human-induced vibration of the pedestrian bridges with longitudinal slopes,which is significantly different from the vibration of pedestrian bridges without slopes,and adversely affects the vibration comfort of the bridges.In order to accurately evaluate the human-induced vibration response of pedestrian bridges with longitudinal slopes,a human-bridge coupled vibration model of bridges considering longitudinal slopes was established by using a biped model with a self-driven mechanism.Numerical simulation of a pedestrian bridge with a large longitudinal slope was per-formed to find the human-bridge coupled vibration response and the corresponding field dynamic tests of the bridge were carried out to check the reliability of the model.The results show that:(1)the longitudinal slope affects the human-induced vibration of the bridge,and the acceleration response of the bridge deck increases rapidly when the pedestrians are walking downhill,and decreases when they are walking uphill,compared with that of pedestrian bridges without slopes;(2)the cou-pled human-bridge vibration analysis model based on the biped model of the self-driven mechanism,which takes the longitu-dinal slope into consideration,can effectively simulate the situation of the pedestrians walking uphill or downhill,with an er-ror less than 2.0%.But the result of the analysis model is unsatisfactory when the pedestrians are walking quickly uphill or downhill.