Effects Of Different Transfer Floor Positions And The Setup Of Short-leg Shear Wall On The Seismic Performance Of Frame-supported Short-leg Shear Wall With The Axillary Beam Type Transfer Structure

Based on the team’s research on different transfer structures of frame-supported short-leg shear wall,we use SAP2000 finite element analysis software to simulate the seismic response of frame-supported short-leg shear wall with beam type hanched transfer structure under the seismic input.At the same time,we consider the influence of the change of transfer floor locations on the seismic resistance of the structure.The setting of short-leg shear wall will also be considered.(1)We will analysis the frame-supported short-leg shear wall with beam type hanched transfer structure with the transfer floor located at the 3、4 and 5 floors by the method of elastic tine-history analysis and response spectrum.According to the information of the model information of structure,vertex displacement,interlayer displacement angle,lateral stiffness and the curve of vertex displacement time history,wo conclude that the higher the position of the conversion layer,the lower the lateral stiffness of the structure.The higher the position of the conversion layer,there will be more possible thar the conversion layer and One layer below the conversion layer become a weak layer.(2)On the basis of the conversion layer located at the 3rd,4th and 5th floors,nine models were established according to the different proportions of short-leg shear walls for the vibration mode decomposition response spectrum method and elastic time-history analysis under the action of multiple earthquakes,and a comparative analysis was made from the modal information,floor displacement,interlayer shear,and interlayer displacement Angle of the structure.It can be concluded that the influence of the proportion of short-leg shear wall on structural deformation is mainly reflected in the upper floors of the conversion floor.The increase of the proportion of short-leg shear wall can effectively guarantee the sudden change of lateral stiffness at the position of the conversion layer and reduce the probability of it becoming a weak layer.(3)By changing the length and thickness of the short-leg shear wall,two sets of models with equivalent lateral stiffness ratios of 0.9,1.0,and 1.1 were established to analysis by the mode decomposition response spectrum method and the time-history analysis method.According to the information of interlayer displacement angle,lateral displacement,we can conclude that the smaller the equivalent lateral stiffness,the lateral stiffness of the structure increases,the interlayer shear force decreases,and the probability of the transition layer and the layer below the transition layer becoming weak layers increases.(4)Two sets of models that the conversion layer of 3,4,5 and the different quantity of the short-leg shear wall will be analyzed by the method of The static elastoplastic analysis.According to the information of Floor displacement angle,floor displacement,performance point data,plastic hinge,we can conclude that under the action of rare earthquakes,such structures still have good ductile deformation capacity and yield mechanism,and the elevation of the transfer layer position and the increase of the proportion of short-leg shear wall will aggravate the development of the plastic hinge of the structure.In conclusion,if the location of the transfer story and the equivalent lateral stiffness ratio are too low,the probability of the lower story of the transfer story becoming a weak story will increase.When the quantity of short leg shear wall is less than 35%,the influence on the structure is small.In the aseismic design of the structure,we should pay attention to the rigidity guarantee of the lower floor of the transfer floor for the high-level transfer.The equivalent lateral stiffness ratio should be close to 1.0.Many short-leg shear walls should be avoided if the location of the transfer floor is too high.