Study On Three-dimensional Seismic Response And Seismic Isolation Control Of The Ancient Timber Structure

The wooden structure of ancient architecture is not only a treasure of China,but also a treasure of the world.Its cultural value and historical value can not be estimated.With the large and small cities being occupied by high buildings,the structure of ancient building wood in China is gradually disappearing,and the material of ancient building wood is wood,and its physical properties are not as stable as concrete,which is easily affected by natural disasters and disasters,and most of the existing ancient architectural wood structures are in a state of varying degrees of damage.At the same time,the uncertainty and randomness of earthquake also bring huge hidden danger to the structure of ancient building wood in the historical river.The structure of ancient building wood is likely to be damaged when the earthquake is strong,and it may even be dumped when it is serious.Due to damage or destruction of ancient timber structure,it is difficult to restore its historical appearance,which will greatly affect its cultural value and historical value.Therefore,the current isolation technology is very suitable for the seismic reinforcement of the ancient building wood structure,which can not only effectively improve the seismic capacity of the ancient building wood structure,but also maintain the historical features of the ancient building wood structure.Therefore,it is necessary to carry out seismic isolation and reinforcement research for ancient timber structures in the current situation.Based on the Xi'an bell tower,this paper studies the seismic performance of the ancient building wood structure by using the large general finite element ANSYS software platform,reveals the influence laws of different seismic magnitude,seismic input direction,seismic wave selection and other series of parameters on the dynamic response of ancient building wood,and further carries out the study of the structure base isolation control of ancient building wood,and discusses the vibration control effect.The effect of the parameters of the fruit and its isolation layer on it.The main conclusions and conclusions of this paper are as follows:1.The finite element model of Xi'an bell tower was established by ANSYS and SAP2000 software platform respectively.The rationality of the model of Xi'an bell tower was verified.The modal and dynamic time history results obtained by two kinds of software were compared and analyzed.At the same time,the results of the ANSYS analysis were compared with the existing literature on the research results of the Xi'an bell tower,in order to ensure the correctness of the finite element model method of the Xi'an bell tower.On this basis,according to the adjustment coefficient of wood material age in the specification,the finite element model of ancient building wood structure in different ages is established.2.The dynamic response of Xi'an bell tower finite element model under multi action,fortification and rare ground motion,namely the acceleration peak value is 0.1g-0.4g,is studied.With the increase of earthquake intensity,the friction energy dissipation performance of the mortise and tenon joints of Xi'an bell tower is also enhanced,reducing the horizontal seismic response,but it has no obvious effect on vertical seismic response.Under the effect of rare earthquake,the bell tower in Xi'an has not reached the limit value of the overall stability damage point of the wooden frame,and still has a certain stability.3.The dynamic response of the ancient building wood structure under the action of three dimensional earthquake is studied.It can be seen that the difference in the combination input of different dimensions of the structure under the action of rare earthquake is remarkable,and the response of the three direction seismic action is greater than the two-way seismic response and the one-way seismic response.It shows that the vertical component of the seismic wave under the action of strong earthquake has a certain effect on the structure of the ancient building wood.Influence can not be ignored.4.The dynamic time history response of the ancient building wood structure in different ages is analyzed.The results show that the peak acceleration and the base shear of the structure level are decreasing with the construction time of the ancient building from 100 years?500 years.The difference between the maximum displacement and the minimum displacement increases with the increase of the construction time,and the longer the age,the worse the seismic performance of the structure.5.The basic isolation technology is introduced into the ancient building wood structure and its isolation model is established to study the vibration control.The influence of the parameters of the horizontal stiffness and damping ratio on the dynamic response of the ancient building wood is further discussed.The results show that the vibration of the superstructure can be effectively controlled under the rare earthquake.The dynamic response of the structure is basically concentrated on the isolation layer after the base isolation.It greatly improves the seismic performance of ancient timber structures,and further reinforces the ancient timber structures.In addition,the peak acceleration of the isolated structure increases with the increase of the horizontal stiffness,and decreases with the increase of damping.It can provide reference and technical support for the seismic isolation analysis and design of the ancient building wood structure.