Dynamic Finite Element Analysis Of Traditional Timber Structure

Chinese traditional buildings have a long history and splendid culture.Timber structure as one of the main structural systems of traditional Chinese architectures has unique history and artistic value.However,the timber structure of ancient buildings has been damaged to varying degrees under the erosion of various natural environments as time goes on.Therefore,it is imperative to use scientific methods to protect traditional timber structure.Due to the complexity of the traditional timber structure,it is difficult to study the whole theory.The model experiment research requires a lot of money and men.Therefore,it is of great significance to study the timber structure of traditional buildings by using finite element technology.Based on the domestic and foreign research status of traditional timber structure from joints,components to overall structure,a finite element simplified model or simplified rules of joints or components was established according to the energy consumption characteristics.And then a more reasonable finite element simplified of overall structure was built.The test result verified the correctness of the simplified method for the traditional building.Finally,the parameters of traditional wood structures are analyzed according to the above finite element model.Based on the hysteretic behavior of traditional timber structural mortise-tenon joint,Dougong,column footing joint and other components,the associated hysteresis model is established,and the mortise-tenon joint,Dougong and column footing joint were simplified by the combined Combine40,Combine40+Combine14,Combine39+ Combine40 of finite numerical simulation software ANSYS,and finally compared with the existing related joints or components of the test.The results show that these simplified finite element models can better represent their corresponding hysteresis performance.Based on the finite element simplified models or rules of the joints and components,the simplified finite element scale model of the Xi’an Bell Tower was established.The dynamic characteristics and dynamic response of the calculated model were obtained by dynamic time history analysis and compared with the results of the shaking table test.The results showed that the simplified finite element model of Xi’an Bell Tower can better express its seismic energy dissipation performance which meant the correctness of the finite element simplification method of ancient building wood structure.Based on the established finite element model of Xi’an Bell Tower,three parameters of timber infill walls,roof quality and subsidiary structure are considered to carry out the model analysis and the dynamic time history analysis.The results showed that the setting of the timber infill walls increased the natural vibration frequency of the structure and improved the rigidity of the structure.The increasing of the roof mass reduced the natural vibration frequency of the structure and increased the relative displacement of the structure.The setting of the subsidiary structure had a certain constraint on the structure which increased the first-order natural frequency of the structure and reduced the relative displacement of the structure.