Evaluation Of Seismic Behavior Of Infilled Wall With Combined Tie-columns

Frame structure is one of the main structural systems used nowadays,whose infilled walls are made of masonry.Due to the material properties of masonry,it is lack of ductility under seismic action which induces earthquake damage or even collapse.Tie-columns can improve seismic performance of masonry infilled wall while it is difficult to ensure their construction quality due to the limitations of construction conditions.In this sense,a novel type of combined tie-column is proposed in this paper.In order to verify its feasibilit,this paper utilizes experimental and numerical simulation to systematically investigate its seismic performance.The major works and findings,around combined tie-column technology in this paper,are concluded as follows:(1)Introduction of combined tie-column technologiesThis thesis first ummarizes the construction requirement of the masonry column in Technical codes,current construction status of tie columns of infilled walls and main problems in their constructions,and then introduce a new type of combined tie-column technology.This technologie is simple,and its construction is of energy conservation and environmental protection,which is fit to the requirements of green buildings.(2)Seismic performance testThis thesis subsequently conducts quasi-static tests on the combined tie-column wall as well as cast-in-situ tie-column.Through comparative analysis of experimental results,the seismic formance of the combined tie-column is studed in terms of the crack pattern,hysteresis curves,energy dissipation capacity,displacement ductility,stiffness degradation etc.The experimental results show that the of combined tie-column has favourable seismic performance,i.e.,high energy dissipation capacity and desirable deformation properity with respect to cast-in-situ tie-column.(3)Finite element numerical simulationBased on the finite element analysis software ABAQUS,this thesis thirdly establish finite element models for tie-column walls,by selecting appropriate elements,material constitutive relation models and reasonable contact models.The simulation results show that the concrete damage plasticity model can be applied to simulate the crack of masonry infilled wall.(4)Parameter analysis of combined tie-columnBased on the ABAQUS finite element analysis model,the in-plane seismic performance of the proposed tie-column are further investigated by parameter analysis,as well as its out-plane seismic performance.The simulation results shows: with the increase of vertical loads,the in-plane ultimate bearing capacity of proposed tie-columns increases while their ductility decreases;Inserting a tie-column in the middle of a relative long infilled wall,its in-plane bearing capacity increases slightly while similarly its ductility decreases;higher ratio of height-width and available interconnection type of beam-wall increase the out-of-plane seismic performance of infilled walls.