Dynamic Response Analysis And Evaluation Of The Wooden Structure Of Guangcheng Building In Liaocheng City Under Traffic Incentives

Vibration excitation caused by traffic is long-term, repeated, and the influence on the ancient timber structure is subtle. The damage of ancient timber structure is continuously accumulating because of the persistent and recurrent, which resulting in reducing overall performance of ancient structures, ground subsidence, cracking, and shortening life of ancient structure. The impact of traffic on surrounding buildings is increasing, especially on ancient buildings cannot be ignored.This paper takes Liaocheng Guangyue tower- national key cultural relics protection units as research target. Guangyue tower was conducted field vibration monitoring for the first time. According to measured value, the paper mean to makesure the method of the speed response value about the site control monitoring point,so that obtain better one which is more closer than the old one;Then,finite element model is established and carrys out modal analysis to obtain the dynamic parameters; the whole finite element model is established and ground transportation vibration effect on Guangyue tower was simulated numerically to obtain its traffic excitation dynamic response; Guangyue tower vibration was conducted security assessments; meanwhile, it provides the basis for dynamic response analysis and assessment about ancient timber structure under the traffic excitation, and offer references to the domestic transport links, design and construction planning nearby ancient architecture. The main contents are as follows:(1) Determine the method of the value of the site control monitoring point response speed. This paper used two ways to determine the control point monitoring vibration velocity response of Guangyue tower. Firstly, the speed of response of the control point monitoring to better were used to control the speed of the vibration monitoring point value method "Ancient Architecture Industrial anti-vibration technology specification" as specified in the monitoring; Secondly, control point vibration speed amplitude probability. Then, make compared and analyzed about two methods and get the closer one which reflect the actual vibration level of timber structure.(2) Finite element model of the Guangyue tower timber structure is carryed out modal analysis to obtain the natural frequency. Then it, the measured values and values which calculated by "ancient architecture anti-vibration technology industry norms" are compared and analyzed.(3) The whole finite element model of soil- high pedestal- timber structure about Guangyue tower is established by ANSYS software. Traffic excitation of circular road monitoring points is inputted into it in order to obtain the dynamic response under the traffic excitation.(4) According to field measurement of the Guangyue tower grain of wood elastic wave velocity, the horizontal vibration velocity allowable value of column top of its top layer is calculated, which provided by "Ancient Architecture anti-vibration technology industry norms", as its limits, and Guangyue tower vibration is conducted security assessments by the measured data and numerical simulation data. Finally, take scientific and reliable measures to protect the safety of Guangyue tower.