Study On The Influence Of Ambient Vibration On The Grand Stage In The Garden Of Virtuous Harmony In Summer Palace

In recent years,with the increase of the urban population and the continuous expansion of the urban area,the ancient buildings are gradually surrounded by the modern cities that are being expanded.The influence of the human environment vibration on the ancient buildings is becoming more and more popular.It is significant for establishing protective measures and reducing the harm caused by environmental vibration to explore the static and dynamic structural characteristics of ancient buildings and their dynamic response under the influence of environmental vibration.In this paper,the Grand Theater in Summer Palace in Beijing is the object of study.Its structural mechanism is analyzed in detail and the force-transfering mechanism of the Grand Theater is studied.The human environment vibration factors around the Grand Theater is analyzed and the mathematical model of the artificial vibration source based on the existing research results is built.The finite element model is used to analyze the dynamic response of the theater under the influence of human environment vibration.The real-time vibration monitoring of the Grand Theater is carried out for two years and the vibration status under the influence of environment vibration is explored through the data analysis.The study shows that:1)The main human factors of the vibration are the walking load,the cars' running load and the subways' running load.2)The frequency of the first 15 steps of the Grand Theater is less than 10Hz.3)Through the numerical simulation,it is found that the three kinds of human environmental vibration factors have different influence on the vibration of the Grand Theater,which mainly affects the vertical direction.The traffic flow density will have a significant effect on the dynamic response of the Grand Theater.The influence of the cars' speed on the dynamic response of the Grand Theater is small.4)Through real-time monitoring,it is found that the vibration of the Grand Theater has a certain regularity.The flow of people and traffic flow have a significant effect on the vertical vibration of the Grand Theater,which is consistent with the numerical simulation analysis.The frequency domain analysis shows that the vibration mainly ranges from 1Hz to 100Hz.