Study On Seismic Behavior Of Mortise And Tenon Joints Of Wood Frame Of Huizhou Ancient Buildings After Repair And Reinforcement

Hui style architecture combines the aura of Huizhou mountains and rivers,and integrates the essence of traditional customs and culture.With unique style,rigorous structure,and exquisite carving,it fully reflects the distinctive local characteristics,whether it is the village planning idea,or the comprehensive application of plane and space processing,architectural carving art.In particular,folk houses,ancestral temples and memorial archway are the most typical.They are known as the three wonders of Huizhou ancient architecture and are valued and admired by the Chinese and foreign architectural circles.As the main structural form of Hui-style architecture,wooden structure has been widely used in the construction of ancient buildings and antique buildings since ancient times,with its unique historical value.However,the wooden frame that has experienced hundreds of years of wind and rain will be damaged to a certain extent: rain moisture,insect and ant corrosion,human factors,etc.,all of which need to be protected.However,the research results on the mechanical properties of the repaired and strengthened tenon-mortise joints of the wooden frame at home and abroad are quite few.Therefore,a two-span wooden frame is used as the research object to carry out the quasi-static test and numerical analysis on the wooden frame to study the advantages and disadvantages of the seismic performance of the repaired and strengthened tenon-mortise joints of a two-span wooden frame.By comparing the skeleton curve,energy dissipation,stiffness degradation curve,which provides the basis for the research on the seismic performance of similar ancient buildings of Anhui style after repair and reinforcement in the future.Main research contents:(1)In this paper,Dunmu Hall,Xu Village,Shexian County,Mount Huangshan City,is selected as the test prototype.As it matches the test site,a scale test is carried out with a scale of 1:2.72.Through the pseudo static test,the bending moment and rotation angle of mortise tenon joints are measured respectively for non-destructive wood frames,tenon integral replacement of wood frames,tenon partial replacement of wood frames,wood beam planting core wood frames,and the bending moment rotation angle curve,skeleton curve,tenon removal curve The research shows that the undamaged wood frame joints have good energy consumption capacity,the overall replacement and reinforcement of mortise and tenon joints is similar to that of undamaged joints,the energy consumption capacity of local replacement and reinforcement of mortise and tenon joints is lower than that of undamaged wood and the overall replacement of joints,and the energy consumption capacity of mortise and tenon core reinforcement joints is slightly better than that of undamaged joints.(2)Through quasi-static test,three different reinforcement schemes of tenon integral replacement reinforcement,tenon partial replacement reinforcement and tenon core planting are studied,and the rationality of different tenon joint reinforcement methods after reinforcement is analyzed.The research shows that the load-displacement curve,skeleton curve and tenon-rotation curve of the integral replacement joint are not different from those of the undamaged wooden frame joint,which proves that the reinforcement scheme is reasonable;The node hysteretic curve,skeleton curve and stiffness degradation curve of the strengthened part of the wood beam are better than those of the non-damaged wood frame,whether it is the upper or the lower core;In terms of skeleton curve or energy dissipation,the local replacement and reinforcement joints are lower than the undamaged wooden frame joints and the overall replacement and reinforcement joints.It can be concluded that the effect of the local replacement reinforcement scheme is poor,possibly because the reinforcement size and reinforcement location of the local replacement node are not optimal.If it is used,it should be further verified by different positions and sizes in the later stage.(3)Modeling a two span wooden frame using modeling software UG and importing it into ABAQUS for further analysis,detailing the constitutive relationship,element selection,friction setting,finite element contact setting,mesh division,and boundary condition determination of the node wood.Through ABAQUS numerical simulation,analysis was conducted on non-destructive mortise and tenon joints,integral replacement reinforcement nodes,and local replacement reinforcement nodes.Three types of mortise and tenon joint bending moment rotation skeleton curves were obtained,and the tenon displacement curve and energy consumption capacity were basically consistent with the experimental skeleton curve.The rationality of the finite element model was verified,and the feasibility of using integral replacement and local replacement reinforcement methods for mortise and tenon joints in practical engineering applications was also verified,And further verified that the overall replacement and reinforcement effect of the tenon joint is better than the local replacement and reinforcement effect of the tenon joint,providing certain reference value for similar engineering cases of tenon joint in the future.