Vibration Characteristic Analysis Of Movable Pedestrian Bridge-vehicle

In recent years,with the rapid development of economy and the improvement of the mass aesthetic consciousness and people pursuit of higher quality of life,people to the requirements of the pedestrian bridge is also increasing.Pedestrian bridge development constantly improve,from the practical demands,aesthetic function,comfort demands,economic aspects gradually realize the diversification of its function.The crowd loads vibration comfort of the pedestrian bridge is becoming more and more get people's attention.In this paper,the structure of the footbridge formed by the movable pedestrian bridge-vehicle is the research object.The vibration response of the structure under wind and foot loads was studied by the Midas Civil finite element analysis software.The vibration response of the structure under the action of crowd loads is analyzed under different design conditions,and the comfort evaluation is made according to the comfort evaluation index.Finally combined with TMD damping technology operating mode does not satisfy the comfort requirement of vibration reduction,to improve the comfort,analyze the vibration reduction effect evaluation.The main work is as follows:The feasibility and preliminary design of the structure scheme for movable pedestrian bridge-vehicle are determined.The research status of the study on vibration of pedestrian overbridge and its method of vibration reduction are studied.Learned the classification,design standard and working status of engineering vehicles,and determine the preliminary design scheme.The theoretical basis of comfort evaluation was studied.In the study of national relevant specification design requirements,learn the vibration comfort evaluation standards of commonly used in China and abroad,and contrast analysis of the differences between different vibration comfort evaluation standard,determine the appropriate to the selected vibration comfort evaluation index.The wind load characteristics are studied and the wind load calculation model is determined based on the existing wind load research theory.Research on pedestrianclassic experiments in china and abroad;According to the characteristics of pedestrian load analysis of the pedestrian load model,combining human cause vibration calculation theory,determine the pedestrian load calculation model and the time history curve;Combining with the engineering truck working principle and some design basic data reasonably simplified calculation model of complete model;On the theory of bridge vibration analysis method to determine and analysis of natural vibration modal calculation;In combination with the comfort evaluation design of the working condition,the vibration reduction calculation model is established based on the principle of vibration reduction,and the vibration reduction effect of the vibration reduction scheme is evaluated.