| The Guangyue Tower is located in the center of the ancient city of Liaocheng C ity,which has a history of more than 600 years.The flow of traffic around the ring road is increasing.The damage of Guangyue Tower will be accelerated under the long term effect of the micro-vibration(traffic excitation).In order to research the influence of traffic vibration on its safety,this paper used velocity response as an evaluation index of historic buildings to study vibration velocity propagation law of Guangyue Tower under traffic excitation.The main work is as follows:(1)The field measured data were preprocessed by MATLAB software(DC removal,removing the trend smooth processing etc).O n the basis of this,the time-domain analysis of the velocity response showed that the response of the vibration velocity increases with the height of the floor.(2)According to the wave theory,the allowable velocity of the mass of the basement of the high pedestal of Guangyue Tower was deduced under traffic excitation,and the velocity response of the measured high pedestal velocity was compared with the permissible value,the results show that the pedestal of Guangyue Tower is in a safe state.Using statistical principles,the field measured data are analyzed,the results showed that the top column velocity amplitudes of the historic building are in normal distribution.(3)In order to solve the difficult problem that the top-velocity response of the historic timber structure was difficult to obtain in the field test,according to the principle of structural dynamics,the correlation between the horizontal velocity response of the top of the column and the bottom of the column was deduced;at the same time,in order to compare the velocity response of wood floor and column top,the conversion relationship between the horizontal velocity of the bottom of each column and the vertical velocity of the floor was deduced.(4)The three dimensional finite element model of high pedestal-annular foundationtimber structure was established by ANSYS finite element software.The simulated vehicle dynamic load was input by moving load to analyze the transient dynamic response of the Guangyue Tower.Finally,the numerical simulation result compare with the Field measured results. |
