DESIGN OF A BASE-ISOLATION SYSTEM FOR SEISMIC PROTECTION OF BUILDINGS ACCORDING TO SEISMIC ZONE FACTOR OF INDIA

A practical solution to avoid structural damage in building during earthquakes involves the use of base isolation, which consists of decoupling the superstructure from its foundation to reduce transmission of seismic waves from the ground into the structure. The main objective of this paper is to develop a new seismic isolation device containing rubber, steel and spring as well which will react resistive in nature during earthquake and can bare lateral and vertical displacement too which as result will not affect the structure of a building. Device contains mild steel sheet of 2.06% carbon, up to 1.65% of manganese, up to 0.5% of silicon and sulphur and phosphorus as impurities, a die springs which are made up of rectangular wire instead of circular, unlike their ‘compression’ counterparts, a elastomer (rubber) sheet named as KL301 which have Shear modulus of 4300 kPa and the thickness sheet is 20mm with diameter of 182mm are used. Test are on simulation based on sliding condition (earthquake resistive building) and on non-sliding condition (earthquake non-resistive building). The seismic isolation device, which is placed on the plinth level, consists of outer steel plate, rubber plate, inner steel plate and spring braces. Spring box allows for free support of the structure in terms of (1) They can control movement in all directions, (2) They can retain deformation in all directions, (3)They can bare horizontal as well as vertical forces (wind, earthquake) on the structure of a building. As a result of simulation by linear dynamic possessing random vibration and response spectrum analysis test on both the building the mass participation were different on both the building which shows that a building without base isolation system have more damage compared to building with a base isolation device by approx. 27% difference.