Research On The Lateral Force Resistance Of Steel-Wood Composite Column

Modern beam-column wood structures are made of metal connectors that conform to the industrial standard instead of mortise tenon connections,the lateral force resistance is usually provided by the joint structure and the lateral foot mechanism.Because of the column feet,beam and column joints can not be completely rigid connection,resulting in the pure beam-column system with limited lateral resistance.According to the form of steel-wood composite structural style,the type of concentric braced frame and the common layout form of the lacing type lattice column,the layout and energy dissipation principle of steel lattice columns decorated with pieces,a kind of lateral force resistance steel-wood composite column structural style which is suitable for assembly structure was put forward in this paper,that is,bending steel bar for lacing and batten elements combined with limb column and beam against horizontal lateral force,using for structural seismic energy consumption.In this paper,ABAQUS numerical simulation analysis and pseudo-static test were used to study the lateral force resistance of steel-wood composite column.First of all,the steel bar detail size optimization process of the steel-wood composite column model were described detailedly by using software ABAQUS,and the type of three groups steel-wood composite column models with steel bar of different bending forms were summarized.Second,the ABAQUS numerical simulation analysis of three groups of models under low reversed cyclic loading were performed.Third,pseudo-static test research of the full size specimens corresponding to the three groups of models were completed.Fourth,the three groups of specimens from the simulated stress state and failure patterns of test,hysteretic and skeleton curves,ultimate bearing capacity,ductility coefficient,degradation curves of secant stiffness,maximum stiffness,cumulative energy dissipation and equivalent viscous damping coefficient and other aspects of the numerical simulation analysis results were compared with experimental research results.The main conclusions were as follows:(1)The hysteretic curves of the three groups of specimens were relatively full of bow-shaped,the hysteretic curve of ZHZA group was much plumper,the hysteresis loop area was much larger,indicated that it had much better energy dissipation capacity.(2)The hysteretic curve of three groups of the full size specimens with steel bar of different bending forms showed larger differences,it showed that the parameters of steel bar including bending form,bending size and cross connection changed to the steel-wood composite column specimens had the obvious influence on the hysteretic performance.(3)In the specimen ZHZA group,average ductility coefficient was 2.41 and equivalent viscous damping coefficient when failure was 0.175,which were the largest in the three groups of specimens.The results showed that better plastic deformation capacity and energy dissipation capacity of the ZHZA group were shown under the horizontal low cyclic loading.(4)The equivalent viscous damping coefficient when failure of the three groups of specimens were 0.152~0.175,which were larger than that common wood frame shear wall(0.113~0.155)and were much larger than the " code for seismic design of buildings "(GB50011-2010)in the structure of the general damping ratio of 0.05,the results showed that the bending steel bars of steel-wood composite columns had better compatibility with the limbs and beams,and the energy dissipation capacity was better,which could meet the requirements of the lateral force of the general building structures.Therefore,lateral force resistance steel-wood composite column structural style which was suitable for assembly structure proposed in this paper was a reasonable structural style.(5)The results of numerical simulation analysis and experimental study were compared,which showed that the results were basically the same.To sum up,the finite element model established in this paper could accurately simulate the changes of lateral force resistance of steel-wood composite columns in the actual test process.Based on the ABAQUS numerical simulation analysis and pseudo-static test of steel-wood composite column with steel bar of different bending forms,the mechanism of seismic energy dissipation of steel-wood composite columns was clarified,which provided references for the steel-wood composite column applied to antique buildings,holiday huts,wooden structure villas,garden sketches,outdoor wooden structures,wooden clubs,wooden structure residences,bamboo and wood structure assembled house in individual areas,as well as existing buildings,the maintenance of ancient buildings and seismic reinforcement work and other practical projects.