Finite Element Analysis Of Third Level's Timber Frame's Seismic Performance In Song Dynasty

As a legacy of ancient culture,wooden structure ancient architecture has important preservation value.Due to natural environment,man-made and other factors,there are many damage and even local damage to the ancient wooden structures,which need to be protected and repaired.Therefore,it is of great significance to study the seismic performance of wood structures.In this paper,according to the regulations on the size of the third-class timber,the third-class timber frame is established by using ABAQUS finite element software and studied.The concrete contents are as follows:The monotone loading simulation of different wooden frame models is carried out.The rotation of the left and right sides of the wooden frame,the dovetail pulled out and the lifting of the mass block are analyzed,and the relationship between the horizontal restoring force and the loading displacement is obtained.The results show that the load and deformation are not the same on the left and right sides of the wooden frame during the loading process,and the load carrying capacity of the wooden frame can be improved by both the vertical weight and the frontal beam also can improve the load carrying capacity of the wooden frame.The low cyclic loading simulation of different wooden frame models is carried out to study the hysteretic characteristics of different wooden frames,thevariation of gravitational potential energy and energy dissipation at the upper end of the wooden frame.The results show that the total energy consumption capacity of wood frame can be improved by increasing the vertical weight and applying the frontal beam,among which friction energy consumption is the main part.In the Initial loading period,the vertical load becomes larger,which is beneficial to the improvement of the load-carrying capacity and horizontal stiffness of the wooden frame.At the later stage of loading,due to the effect of the additional bending moment,the damage of the structure is aggravated with larger vertical load.The gravitational potential energy of wooden frame changes in the` shape of "V" with the displacement of loading.The larger the vertical weight,the more open the curve,and the smaller the peak value of gravitational potential energy is.The free vibration and harmonic vibration of wood frame are simulated,and the range of natural frequencies with different weights and frontal beam is obtained,and the harmonic frequency is determined according to the frequency range of natural vibration of wooden frame.The results show that the higher the vertical weight is,the smaller the natural vibration frequency is,and frontal beam can improve natural vibration frequency of the wood frame.The natural frequency range is divided into three stages: decline,basic stability and decline,in which the wooden frame model is "sensitive" to the frequency in the basic stable range.Dynamic test of simulated wooden frame under the action of SUPERSTIT-ION MOUNTAIN₄5 wave.The results show that the sliding between column and column foundation can reduce the effect of earthquake on the wooden frame,and the greater the vertical weight of the wooden frame,the less the degree of decrease;The rotation of tenon joint plays an important role in the energy dissipation of wooden frame and the influence of earthquake on the superstructure.The vertical load becomes larger here,which is beneficial to the energy consumption and shock absorption of the wooden frame.The square quadrilateral system is formed by frontal,appendicular and column,which plays an important role in energy dissipation and shock absorption of wooden frame.The peak acceleration of seismic wave is 0.1 g,0.3 g and 0.5 g increase,the dynamic response of wood frame increases and the response period increases.The hysteretic curves of each wooden frame model change from linear to inverse "z" shape.Under the action of earthquake,the larger the vertical weight of the wooden frame is,the more beneficial it is to improve the equivalent dynamic lateral displacement stiffness of the wooden frame,and the equivalent dynamic anti-lateral stiffness of the wooden frame can be increased by the amount of the amount.With the increase of seismic intensity,the dynamic lateral stiffness of wooden frame decreases,indicating that the greater the impact on the wooden frame.