The Seismic Response Research On The Storey Isolation System In High-rise Frame Structure

The earthquakes occur frequently in China.,and earthquakes often cause unpredictable and devastating disasters.With the development of economy and urbanization,high-rise buildings are constantly emerging.In order to provide a reference for the practical engineering application of the interstory isolation technology,the study on the isolation of high-rise buildings should be strengthened.The interstory isolation technology is a new type of isolation technology formed in the foundation and development of foundation isolation technology.The isolation layer of the interstory isolation technology is not limited by the location and terrain conditions,so it is more flexible,but the damping effect of the isolated structure varies with the location of the isolation layer.The article takes the 16 story frame structure as an example,using ABAQUS software to model and input El-Centro wave and artificial wave.Draw the following relevant conclusions:(1)Comparing the natural vibration period of isolated structure and seismic structure,the results show that the increase rate is up to 67.2%,and the natural vibration period of the top isolated structure is only increased by 4.4%.(2)The articles changes the location of the isolation layer,The results show that,the reduction rate of floor shear force,floor displacement and floor acceleration is about 50%?70%.The natural vibration period of the isolated structure increases significantly,and the maximum increase rate of the natural vibration period of the isolated structure is 67.2%.(3)The influence of weight and horizontal stiffness parameters of isolation support on the damping effect of the structure is studied.The results show that the weight of the bearing has a great effect on the first three order natural vibration period of the structure,but it has little effect on reducing the floor shear force and the displacement between the floors of the structure.With the increase of the horizontal stiffness of the support,the natural vibration period of the structure decreases gradually,the floor shear force and the interstory displacement of the structure decrease,the maximum reduction is about 50%.As the damping ratio increases from 0.15 to 0.5,the damping ratio of the structure is above 70%and the damping ratio is increased from 0.5 to 0.85.The damping ratio of the structure is only about 20%.(4)The seismic response of isolated structures with different aspect ratio is compared,and the effect of aspect ratio variation on the isolation effect of isolated structures is analyzed.The results show that the ratio of height to width increases gradually from 3.0 to 4.0,and the floor shear force,floor displacement and acceleration of the isolated structure increase by 45%.When the aspect ratio increases from 4.0 to 5.0,the seismic response of the structure increases by about 25%.