Research On Mechanical Properties Of Bucket Arch And Crossing Of Ancient Buildings In Huizhou

Because of its unique tenon-and-mortise connection form and the ease of processing of the wood itself,wooden structures have always been the first choice for ancient Chinese architecture before the industrial revolution.Through the ingenious interspersed combination of tenon and tenon in space,a truss-like force transmission is realized.The space expansion of the path improves the seismic performance of the structure and strengthens the integrity of the structure.The bucket arch is the master of the tenon-and-mortise structure.It not only gives full play to the advantages of lightness and ease of processing,but also connects to the bucket arch.As a stable force-transmitting member between the roof load and the bucket arch,the piercing truss is connected to the vertical load-bearing members,which greatly enhances the lateral stiffness of the wooden structure in the horizontal direction and enhances the overall stability.As the most distinctive part of ancient architecture in my country,Huizhou architecture still has a large number of ancient architectures in China.Its repair and reinforcement is the focus of cultural relic protection.It is necessary to carry out more detailed and in-depth mechanical characteristics research on ancient Hui architecture..Regarding the research on the wooden structure of ancient buildings,experts and scholars have done a lot of fruitful exploration,but most of them are for a single component,and the research work that combines the two objects of Dou Gong and Chuan Fang is less involved.This article is based on Dou Gong and The two load-bearing components of piercing fangs are the research objects,and the following research work has been mainly carried out:1 Introduced the research status and necessity of bucket arch and piercing load-bearing members at home and abroad.2 Combining the mechanical properties of wooden materials with orthogonal anisotropy,the material parameters of the commonly used woods(fir and pineapple grids)in ancient Hui-style buildings are tested.The following parameters are mainly measured,namely the tensile strength and the tensile modulus of elasticity.,Flexural strength,flexural modulus of elasticity,and axial along-grain modulus of elasticity.The obtained experimental results prepare reliable data for theoretical calculations and the establishment of finite element material models.Combining the records of the shape and size of wooden components in the official revision of the Song Dynasty "Building Methodology" and the "Code of Practice for Engineering Practices" of the Qing Dynasty Ministry of Industry,commissioned Huangshan Classical Garden Construction Co.,Ltd.to produce five batches of double-span wooden frame experimental models as a test Object.3 Based on the wooden frame of the eight-frame rafter hall with distractions,which is common in the Huizhou school,the wooden frame with four double-spans was made by selecting Chinese fir materials.According to the force form of the double-span timber frame in the actual building,such as the connection conditions of the column foundation,the bucket arch,the piercing and the wooden beam-column structure,reasonable assumptions are made on the boundary conditions and loading methods of the test members,and the pseudo-static The force test analyzes the mechanical properties of the double-span timber frame and the three types of damaged timber frame.4 Using the three-dimensional design software UG NX10 and the general finite element software ABAQUS to analyze collaboratively,set the material properties,boundary conditions and meshing,it is concluded that three groups of double-span timber frame upper bucket arch and cross-truss structure are acting on the vertical load.Displacement-time curve,load-displacement curve at several key points,and the distribution curve of stress and deflection along the axial path through the bottom surface of the bridge.5 Integrate and compare the numerical calculation and test data of bucket arch and piercing arch,analyze the difference of the mechanical properties of each member under the same boundary conditions,and get the results.The static ductility of the combined components of the bucket arch and the pierced truss is in order from the largest to the smallest: the tenon and the dovetail,the center slap,are non-destructive;compared with the non-destructive group,the static ductility of the repair and reinforcement components are improved.The stiffness of the structure when subjected to vertical loads is from large to small: the elastic stage is roughly flat,and the strengthening stage is in sequence: heart palm,tenon and tenon,non-destructive,mid-span dovetail;the stiffness of the components in the failure stage is reduced and the relative stiffness of the components of each test group is reduced The relationship continues to strengthen.Figure [100] table [26] reference [60]...