| Earthquake can be considered as the most dangerous disaster in the world andoften cause a devastating disaster and painful casualties because of its sudden andgreat damage. China is one of the countries hit most seriously by earthquake in theworld.Urumqi is one of the few capitals in8degree seismic intensity all over ourcountry owing to more large fault and high seismic activity level. It is the urgentneed to protect life and reduce the loss of property by the higher performancebuilding of protection against earthquake and mitigation with the development ofeconomy and the progress of technology.The isolation technique is a kind ofeffective measures found by the earthquake of scientific and technical workersagainst the destructive earthquake,but it is not applied widely because of the variousfactors in Urumqi with the region of high fortification intensity and the seismic risk.The base-isolated building with laminated rubber bearings as isolation of thedevice is taken as research object in this paper.the following job is made Combiningwith the urumqi area earthquake risk in point of application.First, earthquake hazards of our country,seismic risk in future and potentialseismic source zone of Urumqi are stated,and the main types of aseismic design andits shortcomings also are discussed.Modern structure damping controlsystem,isolation technology principle and development application situation areintroduced,the advantages,disadvantages and application scope of shock-isolationtechnology are analysed.Second, in the view of design order and design demand,the technologymaturity of seismic-isolation was discussed in the article; Seismic-isolationequipment was also discussed in the view of mechanical behavior, lasting behaviorand fire resistance behavior, seismic-isolation with laminated rubber beatingisolators. Third, take a frame construction of five floors for example, by using finiteelement analysis of SAP2000, with nonlinearity unit to simulate lead core laminatedrubber beating isolators, the characteristic of structure dynamic behavior wascompared. The results showed that natural period of seismic-isolation wasextended to2~3times of seismic's, which is different from characteristic period, soresonance it is not easy to appeared. When great earthquake happened. interlaminarshear of superstructure was about1/4of seismic's, which can be maintain at elasticrange. When even greater earthquake happened, the acceleration of floor was1/5ofseismic's except first floor, which means the damage of earthquake on superstructurewas greatly decreased.Finally, seismic-isolation structure was compared with seismic structure fromthe view of direct cost and investment-benefit criterion. However, if direct cost wasthe only the only considering factor, the cost will be fluctuate at±5%, while from theview of investment-benefit criterion, seismic-isolation structure will be moreeconomic. |
