Human-Induced Vibration Response And Control For Large-Span Floors Under Jumping Loads

Due to high strength material and large-span floor used in public buildings such as railway station, stadium grandstand and gymnasium, the fundamental frequency of the structure system is getting lower, and the stiffness of the floor is decreasing. Now the floor vibration due to rhythmic activities appears regularly. thus carrying out the structure vibration response analysis under the rhythmic load will be very important theoretically significant and practical.Based on the research at home and abroad, experiments on single human jumping load are studied and the crowd jump load model is further confirmed. The human-structure interaction effect on human-induced excitation is studied. On the base of the calculation and analysis of Suzhou Industrial Park Stadium, the human-induced response of large-span structure is analyzed. The main concerns and corresponding conclusions are as follows:1. Experiments on single human jumping load are conducted. The six groups of fixed frequency jumping tests were carried out on the test subjects and acquired 34230 data. The data is analyzed based on statistical distributions and variation ranges of parameters and relationships between them Reference to the existing load model, and puts forward the new jumping load model in frequency division; When the jump frequencies are in low frequency, middle frequency and high frequency, the load models are used in the sin model, sin+sin2 model and sin2 model. And based on the single jump load model, considering the randomness of control parameters, the random crowd loads are studied and simulated.2. SDOF modal parameter identification test of the human body in the standing jump condition is carried out. Rhythmic movements of the test subjects in six fixed frequencies on the test floor are conducted. Based on the free vibration equation through the theory of human body structure two degrees of freedom dynamic model, natural frequency and damping ratio of the slab are obtained by modal test before and after a single human stay on it, then generated them into the equation to get the body vibration fundamental frequency and damping ratio,5.098Hz and 22.94% for human jumping.3. The human-structure interaction effects on human induced excitation are studied. Tests are carried out on the test floor for single human jumping load test, a total of 9783 sets of effective data. The data is analyzed based on parameters, thus statistical distributions of dynamic magnification coefficient, jump frequency and contact ratio are obtained. Compared with the results of the rigid ground, jump force on rigid ground is higher than the test floor around 10%. At the same time, the test results are verified through the finite element modeling and analysis of floor test.4. The human-induced response of large-span floor is analyzed. The finite element model is established for the Suzhou Industrial Park Stadium, and analyzed two kinds of certainty load and random crowd loads dynamic characteristics of structure. The two kinds of load models are fitting test load model and IABSE model. By comparing the results, the correctness of the model fitting of the load test is verified. The human-induced response of large-span structure is analyzed under deterministic load, random load and load considering human-structure interaction. the paper determine using 24 sets of fluid viscous damper energy dissipation systems in order to control the vertical vibration of the structure, the theoretical calculation shows that the effect of vibration response control is very obvious and satisfied the requirements of regulation.