Analysis Of Seismic Performance Of A High-rise Residential Shear Wall Structure

Shear wall structure is widely used in high-rise buildings,especially for use inhigh-rise housing.Coupling beam is the first line of defense for shear wall structure,it’s ductility largely impact the ductility of shear walls.So far,the studies on couplingbeams focused on the deep coupling beam,including the length-to-depth,longitudinalreinforcement ratio,stirrup ratio,concrete strength,shear span ratio and loadingmethods.However,the combination of research and practical projects is less.Therefore,this study is based on an actual project to study the effects of coupling beam shearheight changes on seismic performance of shear wall high-rise residential shear wallstructure.The height of coupling beams is changed to0.45m,0.70m and0.95m,whichof the original is0.6m.By using finite element analysis software Midas building,response spectrum analysis,pushover analysis and dynamic elastic-plastic analysis hasbeen done to study the seismic performance of structure with different coupling beamheight.The main contents of this paper are:(1)Through response spectrum analysis of the first12vibration modes of thethree structures,the period of the first4vibration modes in X direction,cycle ratio,theratio of stiffness to weight and the shear weight ratio has been compared.The resultsshowed that the structure can meet the code;With the increasing of coupling beam’sheight,the ratio of stiffness to weight and the minimum shear weight ratio increases,the aximum drift angle,the maximum displacement and the period decreases;changesin the height of the beam greatly impact on the twisting of structure.(2)The pushover analysis of structure under seismic shear of story of the lateralload in X direction has been discussed.Through analysis, capacity spectrum-demandspectrum curve has been found.Performance points has been found under seldomlyoccurred earthquake.The differences of seismic-induced structural performance isstudied in three aspects:the maximum displacement, the maximum story drift angleand the base shear,while the distribution of beams and shear walls in performancepoints is considered.The results show that the maximum story drift angle meets thecode for shear wall structure;with the increasing of coupling beam’s height,themaximum displacement and the maximum story drift angle decreases,and the baseshear increases and more shear wall and coupling beams occur shear failure.(3)Trough dynamic time-history analysis by using three selected earthquake records,The differences of seismic-induced structural performance is studied in threeaspects:the story displacement,the story drift angle and the story shear while thedistribution of beams and shear walls in performance points is considered.The resultsshow that the maximum story drift angle meets the code for shear wall structure;withthe increasing of coupling beam’s height story shear and base shear force increases,however,story displace,the maximum displacement,story drift angle and the maximumstory drift angle decreases;and more shear wall and coupling beams occur shearfailure.