www.ijltem.com International Journal of Latest Technology in Engineering & Management (IJLTEM) | Volume 1 | Issue 1 | | June 2015| 1 | Earthquake Resistant Structure Base Isolation Meena Noorzai 1 , M.N.Bajad 2 , Neha Dodal 3 1 Post Graduate Student, Department of Civil and Structural Engineering, Sinhgad College of Engineering, 2,3 Assistant Professor, Department of Civil and Structural Engineering, Sinhgad College of Engineering, ABSTRACT Base isolation is a mechanism that provides earthquake resistance to the new structure. The base isolation n system decouples the building from the horizontal ground motion induced by earthquake, and offers very stiff vertical components to the base level of the superstructure in connection to substructure (foundation). It shifts the fundamental lateral period, dissipates the energy in damping , and reduces the amount of the lateral forces that transferred to the building, inter story drift, and the floor acceleration. The work deals with modeling and finite element analysis of a high damping rubber bearing displacement controlled transient analysis was done to analyses the behavior of the isolator during earthquakes Keywords: base isolation, high lead rubber INTRODUCTION Mitigation of structural damage induced by large loads, stemming from earthquake, is of particular interest to engineers. Specifically, in seismic regions, earthquakes pose a serious threat to both the infrastructure and human lives. The protection of civil structures, including its material content and the human occupants, is without doubt a priority to the designers worldwide. The extent of protection may range from reliable operation and occupant comfort to human and structural survival. Base –isolation is one of the most widely applied structural protection technique against seismic events (Soong, 1990). Various researchers have studied the potential of base isolation under far–field and near–field earthquake (Agrawal et.al. 2006). Studies reveled that base isolation strategy performs poor under near source excitation. ANALYTICAL PROCEDURE MODELING PROCEDURE IN ETABS The modeling procedure of isolated base and fixed building in ETAB and design stapes of isolated and response spectrum analysis using UBC 97 for isolated building has been carried out and seismic design procedure has been done using IS 1893:2000(part 1) for the following data is used . Building details  Grade of concrete M30 and steel Grade of steel Fe500  Floor to floor height is 3.5  Depth of foundation below GL, parapet height is 1m, slab thickness is 150 mm  Size of columns 300X700,size of beam 300X450  Live load of floor = 3kN/m^2 live load of roof = 1kN/m  Site located in seismic zone 4 and for zone four Z=0.24  Building is resting on medium soil , for that imported factor as 1  Density of concrete =25kn/m^3  Density of masonry wall =20kN/m^3 Using the above in (G+25) RCC frame the building has been analysed and design for fixed base and isolated bas with lead rubber bearing for earthquake forces by ETABS software.