Seismic Response Analysis On The Isolation Structure With A New Type Of Sma Universal Damper Roller Ball Seismic Isolator

Earthquake disaster is one of the serious threats to human survival and development of natural disasters. In the past hundred years, each large earthquake caused a serious loss to human society. With the development of science and technology, engineering vibration control technology has become a research hotspot. Among them, seismic isolation technology is the most mature and most of the passive control technology and application. This paper presents a new type of shape memory alloy damper and establishes the mathematical model of ball rolling friction coefficient. For the universal damper ball-rolling seismic isolation system, the article makes the process simulation analysis of earthquake. The main work of this paper includes: ○1 A kind of SMA universal damper with large stroke was designed which can be used in small space. Using the simplified SMA super elastic constitutive model, a program was made to study the hysteresis curve of the SMA universal damper which can explain the mechanical properties of the damper. ○2 The mathematical model of ball rolling friction coefficient is established based on the theory of the elastic hysteresis effect and the influence factors of ball rolling friction coefficient were discussed. ○3 The time history analysis of structure earthquake response has carried on a practical project using ANSYS finite element analysis software. The paper study the influence of dynamic response of superstructure which caused by the isolating stiffness, damping coefficient, the amplitudes of seismic waves, the type of seismic wave, ball rolling friction coefficient. Finally, the seismic response of the superstructure of isolation and non isolation structure system under the same conditions are compared.The research results show that the new SMA universal damper has good energy dissipation capacity with the initial strain of the appropriate values and it can be used for special project. The ball rolling friction coefficient is related to ball radius, the normal pressure and material type. The ball radius increases, decreases the normal pressure, the high elastic modulus of the material is beneficial to reduce the coefficient of rolling friction. In the rolling isolation system, isolated layer stiffness and damping coefficient is too large or too small are on the isolation effect of adverse. Increasing the damping coefficient can reduce the relative displacement between the upper plate and the lower plate, but will increase the acceleration response on the upper plate. To a certain extent, increase the seismic amplitude will lead to acceleration and relative displacement between upper plate and lower plate increases. Under different seismic waves, the seismic isolation effect is not the same. Reducing the rolling friction coefficient can effectively reduce the seismic response of the isolation layer on the upper plate. Under the same conditions, the seismic response of upper structure of isolation system is much smaller than non isolation system.