Based On Wireless Acceleration Sensing System Experimental Research On Measuring The Load Of People Walking And Going Up And Down Stairs

The measurement of human-induced load is the basis of studying human-induced vibration comfort.The walking force generated by walking behavior is a typical human-induced load,which is one of the important causes of human-induced structural vibration comfort.In order to study the vibration problems caused by people walking on floors and stairs,this paper uses a wireless acceleration sensor system to measure the walking force,and carried out experimental research on people walking and loading up and down stairs.The specific research contents are as follows:1.Adopt wireless acceleration sensor system to measure the walking force of floor walking.It introduces the preparation work,operation process and precautions during the test.A total of 16 test subjects measured walking loads at 1.4 Hz,1.6 Hz,1.8 Hz,2.0 Hz,2.2 Hz,and 2.4 Hz step frequencies.Get 960 time-history curves and spectrograms.The probability distribution characteristics of each order dynamic load factor under the preset step frequency and the variation law of each order dynamic load factor with the step frequency are obtained.The variability analysis of the test data gives the design value of the dynamic load factor with a certain guarantee rate.Compare the test results with the force plate data given by the existing research results.The test results show that:(1)The test results effectively reflect the characteristics of walking force in the time and frequency domains.(2)The test results of this paper are basically consistent with the test data and conclusions of the force plate of the existing research results.2.Walking test on stairs,the test determined a total of 10 testers at 1.4Hz,1.6Hz,1.8Hz,2.0Hz,2.2Hz,2.4Hz,2.6Hz,2.8Hz,3.0Hz,3.2Hz,3.4Hz step frequency Walking load under.Obtained 1100 time-history curves and spectrograms.The probability distribution characteristics of each order dynamic load factor under the preset step frequency and the variation law of each order dynamic load factor with the step frequency are obtained.The variability analysis of the test data gives the design value of the dynamic load factor with a certain guarantee rate.Compare with the acceleration sensor data given by the existing research results.The results show that:(1)The wireless acceleration sensor system can measure walking load.(2)Pedestrian incentives when descending stairs are more likely to cause structural response.3.Based on the study of the response spectrum of the measured load,the measured load is applied as the excitation force to the standard excitation system,and the acceleration response spectrum curves of the structure under different damping ratios are obtained,a total of 2304.The sensitivity analysis of the response spectrum curve was carried out.The piecewise expression of the standard response spectrum curve is given.Compare with the standard response spectrum corresponding to the single pedestrian load curve generated based on the Monte Carlo method.The results show that:(1)The peak acceleration of the response spectrum increases significantly as the damping ratio decreases.(2)The standard response spectrum curve given in this paper can be used as the basis for calculating the dynamic response.