JMZ-1-1.5B Rubber & Metal Anti Vibration Mount

Advantages of base isolation technology

1. The base isolation can effectively reduce the seismic responseof the structure. The traditional goal of fortification is "smallearthquake is not bad, medium earthquake can be repaired, bigearthquake cannot fall", and the isolated buildings can achieve"small earthquakes, and moderate earthquakes are not bad orslight damage, large earthquake does not lose its function", soit's very effective in protecting structures or internal personnel and equipment from any damage caused by a strong earthquake.

2. Reduce the cost of housing. From the view of the actualeffect of the application of seismic isolation technology inbuilding engineering, for the seismic fortification area of 8degrees or above, which building is higher than six stories, itis applied isolation technology later, the fortificationintensity can be reduced by 2 degrees, so that can save theinvestment cost, a 9-story building with about 10000 squaremeters of steel bars alone can save more than 1 million yuan ininvestment cost, for buildings with basements, which is appliedseismic isolation technology later, its investment, benefit ratiowill be increased.

3. The seismic measures are simple and clear. The object involvedin the earthquake resistance has changed from a complex,uncertain seismic measure that considers the whole structure to aseismic isolation device only, simple and clear. The structureitself is no doubt simplified in design and construction with thepractice of one-general non-seismic area.

4. It will be convenient repair after an earthquake. You can onlyinspect and replace the necessary isolator after an earthquake.Without considering the restoration of the building structureitself, people's life or production will return to normal quicklyafter an earthquake, which brings about very obvious social andeconomic benefits.

Current base isolation technology and its development direction

Rubber cushion isolation technique is the most widely used newengineering seismic technology in the world. It uses a rubberisolation cushion as an energy isolation device between the baseand the base of the structure, "separate" the superstructure fromthe foundation to the effect of "softness". According to theseismic simulation shaking table test and seismic measuredresults, it is shown that the structural acceleration response ofthe rubber isolation system with the sandwich layer is only 1 / 4-1 /12 of the velocity response of the traditional seismic structure(fixed foundation). Adding steel plate sandwich to rubberisolation cushion is a typical isolation installation. It has great vertical bearing capacity (50T- 2000T) and great vertical compression stiffness, and its horizontal deformation stiffnessis small (0.25kN/mm-1.8kN/mm), the horizontal limit displacementvalue is larger (10-50cm), it has sufficient initial stiffness toresist wind loads and minor earthquakes, When a strong earthquake occurs, it can slide freely and flexible, when the deformation is too large, the stiffness rises again and has the function of protecting and limiting the position. The steel plate sandwich rubber isolation pad has a large reset ability, and it can be reset automatically in many earthquakes. At the same time, it has good durability and can be used for more than 70 years, which far exceeds the requirement of 50 years service life of ordinarycivil buildings, so the steel plate sandwich rubber cushion hasbecome a widely used isolation device.

Foundation isolation for medium and short period structures underthe influence of ground motion in short periods，the effect ofvibration absorptionmountsis better than that of energy dissipation,but it is sensitive to the input characteristics of ground motion, and cannot completely eliminate the risk of resonance. Semi-active control and hybrid control method can meet different defense requirements to improve the safety of structures underearthquake, if intelligent components are introduced, the effect willbe better, so it's a new area that deserves attention. Inaddition, cooperation and cross-study should be carried outbetween different disciplines and majors, development and use ofdevices, institutions and supporting technologies to form newindustries as soon as possible to support the promotion andapplication of new technologies and to create a safer and morecomfortable working and living environment for human beings.

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