Experimental Research On Measurement Of Human-induced Vibration Load Based On Acceleration Monitoring System

The widely use of the lightweight,high-strength materials has made structures lighter,softer,and frequency of structure is getting smaller.The problems above have caused widespread concern about human-induced structural vibration problems of footbridges,stands and floors.As the basis of studying human-induced structural vibration,determination of human-induced vibration load has become the research emphasis of domestic and foreign scholars.With the continuous improvement of research methods,there are various methods for measuring human-induced vibration load.This paper used the human body acceleration monitoring system to measure human-induced vibration load based on the existing methods,and a plantar pressure monitoring system was also used as a comparative test.Both the two devices were used to measure pedestrian load and bouncing load respectively.Experiments were conducted to investigate characteristics of the human-induced vibration load of various participants with different frequencies.The specific content and conclusions are as follows:1?By comparing domestic and foreign methods of measuring the pedestrian load and considering deficiencies in existing methods such as force plate and force-measuring insole,this paper established mechanical relationship between the plantar pressure and the human body acceleration which based on bipedal walking force model.Then proposed a method for determining the pedestrian load by measuring human body centroid acceleration.And design principle,composition and construction and sensor selection of the human body acceleration monitoring system and of the plantar pressure monitoring system were introduced next.Calibration process of the pressure sensor was described in detail at the last part.2?Tests that people walking at different speed were carried out on several participants.By comparing the test results,including differences in pedestrian load among different participants,differences in results of the acceleration monitoring system and the plantar pressure monitoring system,differences in test values and results of the biomechanical model,and analysis of dynamic load factor of vertical walking force,the following conclusions are drawn:(1)Acceleration monitoring system could be used to measure the pedestrian load,and the test results effectively reflected the characteristics of the pedestrian load in time domain and frequency domain;(2)The pedestrian load measured by the acceleration monitoring system was basically consistent with the results of the biomechanical simulation and previous test results.3?Based on the pedestrian load test,the acceleration monitoring system was used to measure the bouncing load of multiple participants at different frequencies.The bouncing load of different participants and the variation of bouncing load at different frequencies were analyzed successively.Then compare the test results of the acceleration monitoring system with the plantar pressure monitoring system to verify the test results.At last,comparison was made with load models of domestic and foreign researchers.The final conclusions are as follows:(1)Acceleration monitoring system could be used to measure the bouncing load,and the test results effectively reflected the characteristics of the bouncing load in time domain and frequency domain;(2)The bouncing load measured by the acceleration monitoring system was basically consistent with previous test results.