Study On Seismic Behavior Of Frame-supported Short-leg Shearwall Structure With Haunched Transfer Beam

At present, the research on the seismic behavior of frame-supported short-leg shearwall haunched transfer beam structures are mainly restricted by the experimental studyto understand the bearing capacity and load transfer mechanism of this kind of structureunder cyclic loading. However, as a result of the insufficient specimens in number, thelaws of seismic behavior can not be fully revealed. So this thesis, based on the previousexperimental researches, using the finite element analysis software ABAQUS to analyzeby finite element of seismic behavior under low cyclic loading. By comparing the finiteelement analysis results with experimental results, verify the reliability of ABAQUS inthe analysis of the seismic behavior. And use ABAQUS by changing the parameterssuch as axial compression ratio, span-depth ratio, ratio of thickness etc. offrame-supported short-leg shear wall haunched transfer beam structure to further thestudy of the influence of these parameters on the seismic behavior.Based on the experiments and finite element analysis results, this thesis mainlystudies the frame-supported short-leg shear wall haunched transfer beam structure’shysteresis curve, skeleton curve, ductility coefficient, bearing capacity and failuremechanism under the interaction of vertical load and horizontal load to reveal thechanges of structure of the seismic performance of such conversion. Thus when designframe-supported short-leg shear wall structure of the haunched beam type conversion,rational suggestions and construction measures can be put forward.Through finite element analysis results and experiment, the following conclusionscan be drawn:1) Frame-supported short-leg shear wall haunched transfer beamstructure contains reasonable damage mechanism and good seismic performance byrational design. Such kind of structure has full hysteretic curve, gentle decreased degreeskeleton curve and good ductility and energy dissipation capacity. At the same time, thestiffness distribution of every floor is more even, which can effectively overcome theweakness of the bottom floor.2) When the short-leg shear wall axial compression ratiois between0.1and0.55, the bearing capacity limit and ductility coefficient of suchstructure will increase as axial compression ratio increases. But the stiffness degradationrate is not affected by it. However, too small axial compression ratio will lead to columnhinge emerge before beam hinge, which is not conducive to seismic.3) When theshort-leg shear wall thickness ratio is between5and8, the bearing capacity and ductility coefficient of such structure will increase a lot as the ratio of thicknessincreases. But high ratio of thickness will cause stiffness degradation and make theframe pillar end concrete damage more serious. At the same time, too small ratio ofthickness will make the damage of short shear wall more serious, which is also notconducive to seismic.4) When the transfer beam span-depth ratio is between4.9and8.0, this kind of structure bearing capacity limit and lateral stiffness will greatly increaseas the transfer beam span-depth ratio decreases. But too small span-depth ratio willmake the concrete of short shear wall and frame column end damage degree aggravateand accelerate structural stiffness degradation rate, which is not conducive to seismic.At the same time too big span-depth ratio causes reduction of the ductility coefficientand weakens the ability of plastic deformation.5) When the haunch angle is between0°to35°, the bearing capacity limit and stiffness degradation rate of this kind of structurewas not affected by haunch angle. But too small haunched angle will aggravate thedamage of short-leg wall bottom concrete. At the same time, increased haunch anglewill make the transfer beam plastic hinge position move from beam end to haunch end.