| China’s wooden architecture has been famous all over the world since ancient times.For example,some ancient pavilions and wooden towers that stand tall today,due to the accumulation of time,the timber of ancient wooden buildings gradually began to age,and the interior of buildings appeared to decay and deformation.Some seriously damaged structures were on the verge of collapse even in strong wind,earthquakes,and other natural disasters.Therefore,it is of great social significance and scientific value to study and protect these historical and cultural heritages.This paper studies the seismic performance of the existing two different wooden post-long joints(palm and tenon joints)in Feiyun Pavilion,Wanrong County,Shanxi Province.They are formed by splicing two mortise-and-tenon wooden components and then fasten with three steel hoops.Firstly,this paper has used scaled model tests to study the seismic performance of the composite joints.Then,the joints have been analyzed by finite element numerical simulation to verify the model test results.Finally,the analytical models that reflect the mechanical relationship of various components of the wooden joints have been established,while the calculating formulas of the joint’s bearing capacity have also been derived.The main research contents are as follows:(1)The timber used in experiments has been firstly tested for material properties.According to the specification requirements,the following tests have been carried out:the wood density and moisture content test,the along-grain compressive strength test,the transverse-grain compressive strength test,the along-grain tensile strength test,the along-grain shear strength test,and the along-grain compressive elastic modulus test.Depending on the test results,effective parameters of timber were obtained,and the foundation of the experiment,numerical simulation,and theoretical analysis studies was also built.(2)Based on the dimensional analysis method,a similar criterion suitable for the quasi-static test was established.The test models of palm and tenon joints were then made and tested by horizontal low-cycle reciprocating loading tests.Through the research of the failure characteristics,hysteresis characteristics,stiffness degradation ability,and energy dissipation capacity of the joints,the seismic performance of the wooden column extension joints was thoroughly studied.(3)On the basis of experiment results,the numerical models of the wood-steel composite joint have been established,and the finite element analysis has been conducted.The mechanical performance of the composite joints under the numerical simulation was then analyzed.The results show the rationality of the numerical simulation method by comparing the numerical results with the experimental results.(4)According to the interaction relationship between various components of the joints,the analytical models of the two joints under the horizontal and gravity loads have been established,and the theoretical calculating formulas of the bearing capacity-deformation relationship of the two joints has been derived. |
