Study On Seismic Behavior And Reinforcement Design Of Interior Joints In Traditional Wooden Residential Buildings

Chinese traditional dwellings,rich and unique in shape and exquisite in construction skills,are the crystallization of wisdom which were passed down from generation to generation by the working people in our country.However,these residential buildings are mainly located in the vast rural villages and towns,which have not been subjected to modern seismic design.In the past earthquakes,the earthquake disasters in the wooden houses are mainly shown as tenon pulling out,wall collapse,wooden frame twisting and so on.Therefore,it is imperative to study the seismic behavior and reinforcement of the traditional wooden houses.It is necessary to establish a complete reinforcement design calculation formulas.In this paper,based on the earthquake damage characteristics of wood-structure residential buildings,The behavior of these joints such as the failure patterns,hysteresis curve,skeleton curve,stiffness strength degradation law,joint deformation ability,energy dissipation capacity of the half-tenon joints and the strengthened joints are obtained through the low-cycle reversed loading tests of one group of mid-column ban-tenon joints and four groups of ban-tenon specimens strengthened with angle steel with different parameters.The test results show that the failure form of the half-tenon joint is tenon pull-out failure,the shape of the hysteresis loop is the reverse Z shaped and the pinch effect is obvious.The failure form of the strengthened semi-tenon joint changed,the tenon was broken,the angle steel was deformed,and the hysteresis curve was fuller.The bending moment and stiffness of the joint are obviously improved,the energy dissipation capacity is not obviously reduced,and the joints maintain good deformation ability.The strength degradation phenomenon is also improved obviously.The rotational bending moment and stiffness of the joint will increase with the increase of angle steel thickness and decrease with the increase of angle steel limb length.In summary,the seismic performance of the strengthened joint is obviously improved.Through the finite element simulation analysis of the test by ABAQUS software,the stress distribution diagram and the skeleton curve of each joint model are obtained.The feasibility of finite element modeling is verified by comparing the finite element analysis results and the test results.On this basis,the finite element parameter analysis of strengthened joints is carried out.With the increase of the height of the beam,the ultimate bending moment and stiffness of the node model increase gradually.With the increase of the yield strength of the angle steel,the ultimate bending moment value of the node model increases but the stiffness changes little.Supplementary modeling of the length and thickness of angle steel is carried out,and the results are in agreement with the test results.According to the mechanical characteristics of the joints,formulas for calculating the moment-rotation relationship of ban-tenon joints and formulas for calculating the bearing capacity of the joints strengthened with angle steel are established,which can be in good agreement with the experimental results and have a guiding significance for the practical strengthening works of timber residential buildings.