Simulation Of Single Human Walking Load And Human-induced Vibration Response And Control For Large-span Floors

With the development of construction technology and the application of light weight, high strength materials, when the load frequency of people walking is close to the fundamental frequency of the structure system, it will cause large vibrations, thus bring distress and upset to people’s physical and mental.In addition, long-term vibration will also reduce the fatigue life of structure, thus carry out the structure vibration response analysis under the load of the crowd will have very important theoretical significance and practical value.Based on the research results of our team and related research at home and abroad, experiments on single human load have been studied, and further research into the stochastic crowd loads, analyze and measure the human-induced response under stochastic crowd loads of the WanLin museum in Wuhan University; the human-induced vibration response and control is launched, the main concerns and corresponding conclusions are as follows:1. Experiment on single human load is done. Conducting the walking load experiments of walking normally and 18066 datas are acquired, studying the characteristics of pedestrian load parameters and distribution, and the relationship between load and the related parameters are revealed. Then carrying out walking load experiments of 100 people in 4 conditions, respectively, walking、inl.7Hz、2.0Hz and 2.2Hz, Studying the relationship between the parameters and frequency and the model of single human load and the stochastic crowd load are built.2. Analysis of the human-induced response of long-span structure is executed. Calculate the response under certain and stochastic human loads in different analysis conditions considering different density of pedestrians, the crowd walking frequency. The results show that the structure produce larger vertical acceleration response and trigger the body’s comfort level, and this should be controlled.3.In-site test of dynamic characteristics and response for large-span structure is carried out. In the test conditions of crowd loads, as the walking frequency gradually close to the vertical natural frequency of the structure, the acceleration response obviously begin to enter a state of resonance and has to be controlled. Compared the test results to the results of finite element model, both are consistent.4. Analysis on vibration control of large-span structure is acheived. The vibration of large-span structure is controlled by using TMD. The results of the analysis show vibration response under various operating conditions can be controlled by reasonable TMD layout. Under certain load condition vibration reduction rate changes together with excitation frequency, and keep within a certain range, control effect is obvious.