The Research Of Mechanical Properties And Seismic Isolation Effect Of Restrained Rubber Isolation

China is located in the world's two major seismic belt,the circum Pacific seismic beltand the Eurasian seismic belt.China has been one of the countries with the most serious earthquake disasters in the world,which has the characteristics of wide distribution,high intensity and heavy losses.In recent years,China's economic is developing rapidly,which led to the rapid development of the infrastructure,a large number of bridges in various forms are springing up.How to ensure the safe operation of these bridges under the possible earthquake,to reduce the economic losses caused by the earthquake disaster,while the design is not too conservative,has been an issue of great concern to the engineering community.At present,in the seismic design of the bridge,we often use friction pendulum isolation bearings,the hyperbolic spherical isolation bearings,lead rubber bearings and viscous dampers isolation devices.By using these seismic isolation bearings and devices,the vibration frequency and damping ratio of the bridge can be changed to reduce the response of the structure.But these isolation bearings and devices are difficult to make and install,expensive,and require high maintenance cost and technology,so all kinds of seismic isolation devices were not widely used.So how to provide a bridge seismic isolation device which is simple,economical,and suitable for most bridges become an urgent need for the bridge constructions.In this paper,a simple practical and new rubber isolation device is studied,which is made up of rubber cylinder and external restraint material.This new type of rubber isolation device relies on external constraints to change the mechanical properties of the rubber cylinder,to achieve different seismic effects.The main work of this paper are as follows:(1)Study the static mechanical properties of rubber isolation device based on different parameters.The rubber material is natural rubber,and the restraint material is carbon fiber reinforced polymer.Rubber is a kind of super elastic material,and carbon fiber reinforced polymer is a kind of anisotropic material,it has high strength and elastic modulus in the direction of grain.Using carbon fiber reinforced polymer material to restrain the rubber cylinder,can change the mechanical properties of rubber isolation device,in order to achieve the functionof isolation and energy consumption.In this paper,the mechanical properties of rubber isolation device are studied by numerical simulation and experimental comparison.(2)Study the dynamic mechanical properties of rubber isolation device.Rubber has the characteristics of viscoelasticity,which can cause creep and relaxation,and the hysteretic curve will be produced under the dynamic load.The dynamic mechanical properties of rubber isolation device is studied by finite element dynamic analysis,and the capability of energy dissipation can be further understood.(3)Study the seismic isolation effect of rubber isolation device.The rubber isolation device is applied to the bridge,and the seismic response of the bridge is calculated to check its seismic isolation effect by the time history analysis method.