The Design Method And Discussion Of The Stress Control Of The Rubber Bearings On The Complex Base Isolated High-irse Building

In recent years, seismic isolation technology has been developed rapidly and appliedin many practical projects, some projects have experienced real seismic test, showing gooddamping effect, especially in high intensity area. In addition, the use of isolationtechnology has also economic effect is very good.However, from the current development situation, isolation technology is mainlyapplied to the ordinary rules of construction, especially in our country, rarely used inhigh-rise buildings and other complex structures. This is mainly because of a high buildingand complex will produce larger overturning force under horizontal earthquake action, thebearings produced large axial tension and compression stress, and the laminated rubberbearings are easily damaged by tension. The current domestic production of bearings in acertain extent affect the development of high-rise complex base isolated building structures.Therefore, how to avoid and control bearings appeared tension stress is a problem to besolved at present.This paper will analyze the problems of high-rise buildings in seismic isolation design,using structural finite element analysis software ETABS modeling and analysis, combinedwith the practical engineering of high-rise building seismic design of a high intensity area, carry out the following work:(1) Reviewed the development and status of domestic and international buildingisolation, summarizes the restoring force model of high-rise isolated building method ofdynamic analysis and rubber bearings, introduces the calculation method of the verticalcurrent isolation bearing stiffness reduction.(2) Respectively summarized process isolation architectural design rules and complexhigh-rise buildings, and points out the difference between the two.(3) The whole design process of a complex high-rise isolation is presented in thispaper, summarizes the high-rise buildings in seismic isolation design of ground motionselection, structure optimization, isolation layer arrangement and support optimizationrules.(4) Through a lot of analysis of a high-rise buildings isolated examples, discusses thechanges of isolator parameters of rubber tensile to compressive stresses on bearing.Through the above research work, this paper draws the following conclusions:(1) High-rise isolation should be designed to minimize the eccentric superstructurerate, weakening the upper part of the shear wall bearing stiffness can effectively reduce thebearing stress value. But must take account of the adverse iMPact of torsion. In addition,the upper structure adjustment and optimization of the isolation layer is needed forcontinuous cross repeated, due to shear wall can absorb the earthquake force, more than theframe column therefore, seismic design of frame shear wall structure is not suitable forhigh-rise buildings.(2) When the rational design, complex high-rise isolated structure can achieve thedamping effect is very good.(3) The vertical change of individual isolation bearing stiffness can effectively reducethe support under the action of earthquake stress values for structural response, littleiMPact, but will increase the stress bearing and the adjacent, therefore must also take intoaccount the adjacent bearing stress value is too large. At the same time the change ofmultiple support vertical stiffness can further reduce the whole structure under earthquakeaction of axial force.Some research has been done on the isolation design of high-rise building has certain reference value for promotion, hoping to benefit the isolation technology of high-risebuildings.