Analyse The Influence Of Floor Size On Vibration Comfort

Because of new structural materials,construction method and structural system,modern building,things become lighter,more soft,span bigger,these built in mechanical,polymer structure and human activities under the action of vibration response of the easy generation is more noticeable.It can bring discomfort to the occupant in the construction structure,reduce the quality of working life environment and cause the comfort of vibration.This article mainly aimed at the research on the effects of floor slab size of floor vibration comfort: according to the evaluation of vibration comfort,find out the steps within 1 ~ 2.8 Hz frequency range of a single pedestrian under the action of load in the center of the floor,analysis under different slab size parameters of vibration comfort.The factors of measuring the width ratio and thickness of the single cross floor were analyzed,and the factors of span of multi-span floor were analyzed.Discussed in the analysis of the finite element model of the three factors are fundamental frequency,and the results are imported into the MATLAB introducing acceleration response,summed up the trend of each factor under the corresponding response.The basic frequency of floor board is the inherent characteristic of the structure,and the quality of floor model is increased with the increase of the base frequency of floor slab.Large floor area floor and long span are low in base frequency.Single span slab width W remains unchanged,floor length change,aspect ratio to 1 weight floor acceleration,the largest floor surface area of the acceleration,the greater the more strides loads.Increase the thickness of the slab increases by changing the thickness of the floor slab of basic frequency and modal mass,floor is closely relative to basic frequency and the thickness of the floor,reduce weight increase of the thickness of floor acceleration.In the multi-span floor,the increase of the base frequency and acceleration of the floor span increased to 3 by 3,the acceleration of the floor board and the change of base frequency were very small.The floor length of the floor is smaller than the floor speed and the acceleration response.Based frequency almost linearly increase floor slab thickness increases,the low-frequency floor acceleration gradually decreases,and high frequency speed increase of the floor slab,across the number increased to 5 by 5 stabilized after high frequency changes in the rate of floor is very small.When stepping frequency range is limited to 1 to 2.8 Hz under single-point walking load effect,length-width ratio and thickness is changed for single span and multispan floor,accelerated speed of floor response has obviously changes,but it will not change scope and grades of comfort level of floor vibration;in multispan floor,accelerated speed of response increased by floor spans will increase to a range and will not has obvious changes,as well as not change scope and grades of comfort level of floor vibration.