Research On Overturning Resistance Of High-rise Isolated Shear Wall Structure With High Aspect Ratio

In view of the overturning resistance of high-rise isolated shear wall structure with high aspect radio.The paper base on theoretical derivation,through the shaking table test and numerical simulation to study this problem.Establish the high-rise shear wall structure simplified analysis model and the dynamic differential equation,considering bearing vertical damping and the rotational kinetic energy of structure.In order to verify the performance of isolation and overturning resistance,shaking table experiment was carried out for high-rise shear wall structure with aspect ratio of 3.96.the current widely used time history analysis method was summarized.Based on the Newmark-? and variable step five order Runge-kutta,time history analysis method combined with Boucwen hysteresis model was deduced.Time history analysis program is compiled by using MATLAB software and analysis the dynamic response of isolation layer under considering different intensity and aspect ratio.Analysis results show that:(1)there is inertia coupling phenomenon on the response of the direction of translational and rotational displacement and rotational displacement is more sensitive to the high frequency excitation,while translational displacement is more sensitive to the low-frequency excitation.(2)Through analyzing the resu]ts of shaking table test,large aspect ratio of isolated shear wall structure has obvious damping effects,upper structure lateral reaction giving priority to with translation,without obvious weak layer and Isolation layer not appeared slight tensile stress until met the rarely earthquake but not above the limit value.The result show that compared with large aspect ratio frame structure,the overturning resistance of large aspect ratio shear wall structure is more obvious and that will provide the reference in the promotion of base-isolated structure in high intensity area.(3)the dynamic response of isolation layer under different aspect ratio was analyzed through MATLAB program.The result show that large aspect ratio shear wall structure in the direction of rotation is a dynamic process so the effect of the rotational inertia force should be considered.In the certain intensity and earthquake acceleration,the vertical stress state of isolation bearing changing with the increase of aspect ratio(inertia),so the effect of rotation inertia force of high-rise shear wall structure for overturning resistance can not be ignored.