The Dynamic Characteristics Analysis Of Xi’an Bell Tower Under Traffic Incentives

In this paper, on the basis of monitoring of the national key cultural relicsprotection units-Xi’an Bell Tower, use random vibration theory of the dynamiccharacteristics ground transportation vibration Xi’an Bell Tower; By actual monitoringpower response and finite element model of the dynamic response data to identify thephysical parameters of the Xi’an Bell Tower, Analysis stiffness and damping and thecurrent state of use of the Bell Tower what is different to the general framework of thestructural characteristics, the main contents are as follows:Under the bell tower of the vibration signal by monitoring traffic incentives, onthis basis, Application random decrement vibration signal into free vibration response,use ITD method to identify the modal parameters of the bell tower to Natural frequencyand damping ratio.According to Bell Tower and its surroundings, On the basis of the vibration dataWhat was obtained by the monitoring, first time to identify the physical parameters ofthe bell tower by the method of dynamic inversion of the unknown substrate enter,received stiffness and damping of the Bell Tower.According to the structural characteristics of the Bell Tower, established theANSYS finite element model of the Bell Tower, analyzed its modal, the results showthat the agreement with the measured data to identify data items.Analyzed the reason of the error between the anti-performance physical parametersof measured data with the theoretical value, by finite element simulation, show that thepick-up point and motivating input mode will not have a major impact on parameteridentification. And by contrast the speed response curve of the bell tower of the secondfloor and the roof, found that the roof of the speed value is right by assume the bell tower wooden structure frame structure, almost not impact the results of the parameteridentification.Based on the power response data of the finite element model anti-performancestructure physical parameters, and compared physical parameters calculated inaccordance with the general framework, found that the stiffness and damping are small;Comparing it with the physical parameters of the signal recognition according to theactual monitored power, received the Bell Tower damage index, the overall quantitativerelationship between the bell tower of the status quo and the actual damage.