Study On Seismic Behavior And Damage Mechanism Of Timber Structure Of Guihe Building In Wuhou Shrine

Chinese timber structure architecture has a long history,rich modeling,unique structure,and occupies one of the major positions in the world architecture.Due to superior forest resources and climate environment,there are a large number of traditional timber structures in the Sichuan-Chongqing region.Among them,the Chuan-Dou timber structure is the typical representative of traditional timber buildings in the south of China.Several studies on earthquake disasters showed that the Chuan-Dou timber structure has unique seismic advantages,but the research on Chuan-Dou timber structure is incomplete at present.Meanwhile,due to the growth of years and the invasion of diseases,the traditional Chuan-Dou timber structure is facing the trend of deterioration and gradual demise.It is urgent to carry out in-depth research.This article combined the situation of traditional Chuan-Dou buildings in Sichuan Province,took Guihe building,a typical Chuan-Dou building,as an example,to conduct in-depth research on Chuan-Dou construction technology,seismic behavior and damage mechanism.Based on the survey data of traditional Chuan-Dou buildings in Sichuan,the study found that there is a long history,rich building types and flexible constructions of Chuan-Dou buildigs.Although the structural components are simple,various combinations are derived from the Chuan-Dou timber frame because they are adapted to the local conditions.The structure has a wide range of materials,strong integration,and has strong regional and local characteristics.Meanwhile,it was also found that the materials and the structures of the buildings sustained varying degrees of damage and aging,which buried potential safety hazards.Because the distant construction age,the difference in design and construction levels,the improper use of the environment and maintenance.Based on the Guihe building,the force-transfering mechanism of the joint and the ChuanDou timber frame was carried out.And the fine modeling of Guihe building’s typical equalthickness through-tenon joints,equal-thickness straight-tenon joints,and Chuan-Dou timber frames were established.The stress modes and deformation characteristics of joints and timber frames were obtained under quasi-static loads.The hysteretic curve,equivalent viscous damping coefficient,stiffness degradation curve and slip law of joints and timber frame were analyzed,and the seismic performance,energy consumption performance of the joints and the Chuan-Dou timber frame were revealed.Parametric analysis of two types of joints was conducted to explore the effects of tenon height,tenon thickness,and column diameter on their mechanical properties,and related constitutive relations were proposed.Studies have shown that the equal-thickness through-tenon joint and straight-tenon joint,Chuan-Dou timber frame and Chuan-Dou building have good seismic performance.The bearing capacity and energy dissipation stability of equal-thickness through-tenon joints is better than equal-thickness straight-tenon joints,and the seismic performance of Chuan-Dou timber frame is better than Chuan-Dou timber bent frame.Under the pseudo-static load,the sliding amount of tenon is affected by the structure and position,and different rules appear.Based on the Guihe building,the finite element dynamic model of the whole Chuan-Dou timber structure was established,and the vibration modes were obtained.The whole model was subjected to seismic calculations under 64 different conditions of seismic waves,and the stressstrain,torsion,dynamic response,and weak point effects of the model were obtained.The dynamic amplification coefficient,maximum relative displacement,inter story displacement angle,inter story shear force and lateral stiffness of the through bucket timber frame were further analyzed.For the whole structure,the direction of earthquake action has a greater influence on the dynamic response to the structure,and the difference in lateral and longitudinal stiffness of the structure has a significant effect on the displacement response and torsion.In addition,the method of reducing the number of columns during earthquakes has a significant effect on the vertical acceleration of the wooden frame,and it will reduce the difference in static displacement.In this paper,the vibration response characteristics and damage mechanism of the mortisetenon joints and timber structure of Guihe building are obtained,and revealed the forcetransmitting mechanism,force failure mode and seismic energy dissipation performance.The results are of great significance of improving the theoretical system of the Chuan-Dou timber structure and promoting the reinforcement,protection and development of the timber structure.