| With the rapid development of urbanization,the urban rail transit industry has brought many problems such as noise and environmental vibration.Therefore,it is important to thoroughly analyze the influence rules of different load types on the structure and design reasonable and effective vibration reduction measures.In this paper,four different loads are used to study the vertical response of the structure under different loads.The main research content is as follows:1.Using SAP2000 respectively establish a seven-story frame structure,a seven-story frame structure without local plate vibration,a seven-story interlayer isolation structure,a seven-story interlayer isolation structure without local vibration of plate,respectively analyses the structural dynamic characteristics,at the same time,respectively analyses different kinds of loads,and respectively analyzes the spectrum character.It shows that the main frequency of the subway wave range is40-70 Hz.The main frequency range of environmental wave is5-30 Hz,the main frequency range of truck wave is 5-25 Hz and the main frequency of seismic wave is 0.1-10 Hz.2.This paper analyzes the vertical rule of the seven-story frame structure on the whole,changes the stiffness of the vertical isolation bearing,and explores the change rule of the overall acceleration.The results show that under the action of subway wave,with the increase of the vertical stiffness of the isolation bearing,the acceleration of the position above the isolation layer decreases gradually,and the acceleration of the position below the isolation layer increases generally.Under the action of environmental wave,with the increase of vertical stiffness,the acceleration law under the isolation layer gradually decreases on the whole,but locally changes.When the vertical stiffness of the isolation layer is small,the acceleration above the isolation layer increases gradually.Under the action of truck wave,the acceleration below the isolation layer generally decreases with the increase of vertical stiffness.The acceleration above the isolation layer increases gradually on the whole.Under the action of seismic wave,with the increase of vertical stiffness,the acceleration of the structure above the isolation layer increases gradually and then decreases.There is little change in acceleration below the isolation layer.3.This paper study the concrete influence of different loads on the vertical direction of the structure.Subway wave,environment wave,truck wave and seismic wave are used to study the acceleration,displacement and axial force responses of seismic unconstrained structure,seismic constrained structure,isolation unconstrained structure and isolation constrained structure respectively.The change law of vertical acceleration along the height of the structure,the change law of vertical displacement of the structure,the change law of the stiffness of the vertical isolation bearing and the change law of the structural response are studied.At the same time,the influence of different kinds of loads on the structure is evaluated,such as environmental wave,truck wave and subway wave,and the relevant conclusions are drawn based on the standard of human comfort.The seismic wave is evaluated from the safety of the structure,such as the axial force of the structure,and the relevant conclusions are drawn.4.Taking floor isolation as an example,the influence law of floor isolation on the vertical response of the structure is explored,and the differences between the isolation constrained structure,the isolation unconstrained structure and the floor isolation structure are compared.The following conclusions are obtained: the vertical acceleration of the structure has different responses to different loads after floor isolation,which has an effect on the acceleration of the part without floor isolation,and the acceleration of the part with floor isolation.For environmental waves,the vertical acceleration of floor isolation is between confined and unconfined.For metro wave,the acceleration is smaller than both of them.For the truck wave,the acceleration of the structure varies at the first and second floors,and the vertical acceleration of the structure is smaller than that of the two at the floor isolation parts.For seismic waves,the acceleration of the structure is variable. |
