人-结构相互作用对人行桥振动响应的影响分析OA北大核心

In the footbridge,HSI(human-structure-interaction)was reasonably considered,and the vibration response caused by the crowd was truly predicted.The pedestrian load simulation method based on the body characteristics of Chinese people and considering the traffic flow was established,and a reasonable single-degree-of-freedom spring-mass-damping Human body model(SMD:Spring-Mass-Damping),using the Fourier series of random probability distribution to simulate human-structure interaction by combining moving walking load with human body dynamics model with temporal and spatial variations.The three-dimensional space finite element model of human-bridge integration in SILVA experiment was established by finite element software,and the rationality of pedestrian simulation method was verified by comparative analysis.The influence of crowd dynamic effect simulation and pedestrian overall effect on dynamic characteristics and response of footbridge was further explored.The results show that when the footbridge is in non-resonance,the difference rate between the MF model and the spring-mass-damper(SMD)model is only 0.8%.When the footbridge is near resonance,the difference rate between the two models is 15%.The simulation results of the MF model and the SMD model are significantly different,so it is necessary to consider the influence of the human model.Under crowd load,the response of higher order harmonics increases significantly,with a minimum increase of about 83.2%.The phase Angle distributed uniformly according to[0,2π]is closer to the actual load state.The simulation of human effect is closer to the measured results of SILVA experiment than that of pure load simulation.The longitudinal distribution of pedestrians and the direction of the path have significant effects on the lateral vibration,but negligible effects on the vertical vibration.There is a strong positive correlation between structural vibration response and population synchronization rate.The research results can provide some references for coupling dynamic analysis considering human-bridge interaction.