The Seismic Performance Analysis Of The Reinforced Concrete Frame-shear-wall Structure With Isolation Device

Our country is an earthquake-prone country. The pain2008.5.12Wenchuan earthquake brought us has not yet recovered. End of the last century,more and more engineering construction began using a new technology thatcalled seismic isolation, which are very different from traditional seismicmethods, seismic isolation device by setting it to absorb seismic energyconsumption and to reduce small structural seismic response of the earthquakefrom "resistance" change to "softness", is a method of active vibration absorberdamping becomes passive seismic is. Relative to rely on their own strength anddeformation structure to absorb seismic energy, the cycle of isolation anddamping of the structure has greatly improved, so acceleration and displacementresponse was significantly reduced. Ultimately achieve "a small move, theHouse does not move; large move, floor fretting" effect.In this paper, a building area of high intensity shear wall structure ofreinforced concrete frame---as a prototype which using two differentapproaches, through numerical simulation of engineering analysis, comparativestudy of their response under seismic action, in order to judge the isolatedstructure damping effect and damping law. This paper first describes the development and application of structures isolation technology; secondly,introduces the basic theory of rubber is mainly used in isolation and isolationtechniques applied technology are briefly described; finally, respectivelystructural calculation software PKPM advanced finite element analysis softwareMIDAS/Gen and focus on isolated computing software ETABS, established:（1）1basement, ground10floors of reinforced concrete reinforced concreteframe-shear wall structure without isolation layer model (referred to asnon-isolation layer model);（2）1basement, ground10-story reinforcedconcrete frame shear wall structure---isolation layer model (referred to haveisolation layer model) Numerical analysis of two models.Through studies show that the use of lead core rubber bearings, reinforcedconcrete frame-shear wall structure significantly increased natural cycle, canwell avoid the predominant period of the construction site, to achieve betterisolation effect, reduce little damage. Additional isolation bearing reinforcedconcrete frame-shear wall structure between layers and layers of sheardisplacements are smaller than the original reinforced concrete frame-shearwall structure under earthquake response value of. Floor acceleration responsewas significantly less than the original structure, through isolator can largelyreduce energy consumption and peak acceleration after the upper structure.Lead rubber bearings weight changes have little effect on the structure of naturalcycles. Lead rubber bearings equivalent horizontal stiffness values directlyaffect the isolated building isolation performance is good or bad, bearing stiffness, can effectively control the relative displacement of the isolator, but thedamping effect of the upper structure is not ideal; stiffness is small, the relativedisplacement isolator large, but smaller reaction superstructure. Buildingadditional isolator damping effect in the class Ⅰ site (hard ground) than in Ⅳclass venue (Soft) damping effect.