Study On The Mechanical Properties Of A New Joint Between ALC Wall Panel And Steel Frame

At present,in order to change the production mode of the construction industry and eliminate the backward production capacity,the state vigorously promotes the assembly construction.In the prefabricated building,as an important part of connecting the outer enclosure component and the main structure,the importance of the node is self-evident.However,at present,there are few researches on the joint in China,and there are always deficiencies in the process of installation and use of the commonly used joint.Therefore,this paper proposes a new type of joint,which combines the advantages of the commonly used joint at present,improves on the basis of steel pipe anchor joint,and carries out numerical simulation analysis through ABAQUS finite element software,mainly including the following aspects:(1)16 sets of numerical analysis were designed to study the influence of material strength,angle steel thickness,the diameter of the big round hole of the upper joint and the length of the long round hole of the lower joint on the bearing capacity of the steel frame structure.It was found that the order of the above four factors on the bearing capacity of steel frame structure was: thickness of joint plate > material strength > length of long round hole in the lower node > diameter of big round hole in the upper node.Record the whole process from elastic stage to failure in the loading process of the plate,analyze the failure mechanism and failure form of the plate,and find that the failure of the joint is mainly due to the failure of the lightweight wall panel concrete.During the whole cyclic loading process of the test piece,the failure of the concrete at the joint is prior to the failure of the whole frame,except the failure of the concrete near the joint,the whole wall panel has not broken badly.(2)Based on the analysis of the test data,16 groups of quasi-static load hysteretic curves and skeleton curves are obtained.Through the analysis of the energy consumption capacity of the structure,it is found that the hysteretic curves of the new connection joint are relatively full,which does not change greatly under the action of different joints,and is relatively stable.The shape of the hysteretic curve presents shuttle shape,and there is no obvious pinch phenomenon in the loading process.It can be concluded that this new type of joint has good energy dissipation capacity and seismic performance;the overall shape of the skeleton curve can be roughly divided into two stages in the loading process: linear elastic stage and strengthening stage,and the bearing capacity does not decline during the loading process;the secant stiffness,energy dissipation coefficient and ductility coefficient of the orthogonal test are roughly the same shape,and different structural forms of the joint cut each other Linear stiffness,energy dissipation coefficient and ductility coefficient have influence;(3)The influence of different preload on the failure mode of the wall panel is studied.It is found that the larger the preload is,the later the lightweight wall panel will be damaged.(4)The spatial steel frame model is established to analyze the influence of spatial effect on structural stiffness and bearing capacity.The results show that the frame adjacent to the loading plane frame has little influence on the stiffness and bearing capacity of the loading plane frame,which can be ignored.When loading the plane longitudinal frame with wallboard,the influence on the bearing capacity of the spatial frame is greater,and whether other plane frames are arranged with wallboard has less influence on the bearing capacity of the frame;when displacement load is applied,the displacement nephogram of the transverse frame adjacent to the loading plane takes the maximum displacement point as the center,and the deformation of the node angle steel is greater,but the stress of the bolt and the wallboard are not up to the extreme Limited strength.