Research On Seismic Response Of Separated Isolation Device Based On Isolation BENCHMARK Model

Isolation technology has been widely used in seismic protection of various structures.Most of the isolation technologies are designed for far-field earthquake and other conventional earthquake.For the structure with large period,it is impossible to continue to increase the period of structure to improve the isolation effect.Therefore,it is necessary to increase the damping of isolation layer and consume more seismic energy through isolation layer,so as to obtain better isolation effect.In this paper,the high bearing capacity（GRB）bearing and high damping viscoelastic material developed by our research group are paralleled to form a new separated isolation device.The separated isolation bearing can solve the problems encountered by the LRB Isolation Bearing.The separated isolation bearing can not only meet the requirements of vertical bearing capacity,but also obtain better isolation layer damping and increase the period of structure through the combination of friction sliding system and high damping material.In this paper,the test of isolated isolation device is carried out firstly,and then the numerical analysis is carried out according to the test results.Firstly,the paper introduces the structure design and working principle of the separated isolation device,and establishes the corresponding mechanical model.Through the experimental study of the separated isolation device,the paper studies the repeated loading times correlation of the bearing,the friction performance of the bearing with high bearing capacity and the loading frequency correlation,so as to compare the mechanical model of the bearing,Verify the the isolation device design,and provide relevant parameters for a series of analysis later.Based on the study of the experiment of the separated isolation device,the finite element analysis is carried out.The ETABS software is used to establish the isolation BENCHMARK model to select and arrange the traditional bearings.According to the mechanical model and test of the separated bearings,the relevant parameters are obtained,and the separated isolation device is simulated in the software.The dynamic characteristics of the structure are analyzed to verify the accuracy of the model.After the seismic wave is selected,the time history analysis of the structure is carried out.The traditional rubber isolation scheme,the separated isolation device scheme and the separated isolation scheme with high damping material are analyzed and compared under the fortification earthquake and rare earthquake respectively.The reference index is the story shear force and story displacement angle.At the same time,the structural response under the far-field earthquake and near fault earthquake is compared,Further explore the performance of separated isolation device.