# Mechanical Behaviors and Numerical Simulation Analysis of a New Isolation System
## 1 Introduction  
Earthquakes can trigger high-intensity vibrations in a short time, producing tremendous amounts of energy that may result in structural damage or even destruction. To reduce the degree of damage to superstructures under seismic excitation, researchers have developed various types of isolation devices, including rubber, friction, and composite isolation bearings. The most typical passive isolation device is the rubber isolation system (RIS). The RIS is composed of rubber and steel plates laminated together, which is widely used in practical projects because of the elasticity of rubber and the bearing capacity of steel plates with excellent isolation performance. Over the past two decades, researchers have conducted experiments and finite element studies on the stiffness, shear deformation, temperature, and hysteresis curve properties of RIS from multiple perspectives, e.g., [1; 2; 3; 4; 5]. Taking a steel frame structure with FRP rubber bearings as the research object, WU [6] obtained the ground vibration response of the base-isolated structure under different vertical loads, different structural height and width ratios, and different site factors by shaking table testing. Meanwhile, they established a finite element model of the seismic isolated structure with OpenSees to compare the ground vibration response analysis, ensuring the correctness of the results, which showed that FRP rubber isolation bearings can effectively reduce the influence of earthquakes on the superstructure. [PERSON] [7] verified the influence of temperature on the seismic isolation effect by analyzing the correlation between temperature and the bearing performance and stiffness of the rubber bearing, providing a theoretical reference for the engineering application and development of rubber seismic isolation bearings. Friction isolation bearings take friction as the damping force of the isolation layer and have good isolation performance, among which the friction pendulum has a bright development prospect because of its automatic reset capability. On this basis, researchers have developed various forms of friction pendulum bearings and conducted mechanical model derivations and experimental testing to promote the development of friction isolation bearings [8; 9; 10]. For example, [PERSON] [11] proposed a coupled two-way dynamic nonlinear model to numerically analyze the dynamic performance of horizontal two-way systems based on considering the rotation degree of freedom factor. [PERSON] [12] studied the effects of two types of vibration isolation bearings, ball and roller, on the rolling friction coefficient and analyzed the effects of the friction coefficient on the vibration isolation effect by modeling with SAP2000 software. The results showed that the seismic isolation performance is most effective when the rolling friction coefficient is within a certain range. In recent years, composite isolation systems have become a research focus in the field of engineering earthquake resistance due to their advantages of gathering various types of seismic isolation devices and innovative combinations to improve seismic isolation performance to the maximum extent [13; 14; 15; 16; 17; 18; 19]. In terms of innovative combinations, [PERSON] [20] studied the mechanical properties and seismic isolation performance of a disc spring-high damping rubber three-dimensional composite seismic isolation bearing. Numerical simulations were conducted to analyze the mechanical properties of the disc spring using ABAQUS finite element software, and test data were used to analyze the mechanical properties of the high-damping rubber seismic isolation bearing. [PERSON] [21] conducted horizontal and vertical seismic isolation performance tests on proposed disc-spring-stacked rubber three-dimensional composite seismic isolation bearings under different working conditions.