Pradip D Jadhao et al Int. Journal of Engineering Research and Applications www.ijera.com ISSN : 2248-9622, Vol. 3, Issue 6, Nov-Dec 2013, pp.1518-1524 www.ijera.com 1518 | Page Earthquake Performance of RC Buildings Using Elastomeric Base Isolation Controls Pradip D Jadhao 1 , Sunila. Gadi 2 , S. M. Dumne 3 1 Professor & Head, Civil Engg.Dept.K. K. Wagh Institute of Engineering Education and Research, Nashik 2. Post Graduate Student, K. K. Wagh Institute of Engineering Education and Research, Nashik 3 Professor, Govt. Polytechnic, Samangaon, Nashik Road, Nashik ABSTRACT The devastation from earthquakes becomes unpredicted resulting to significant damage of civil structures, leads to loss of lives and property. The base isolation of passive control system is one of the most powerful techniques for protection of civil structures against to seismic hazard. The study in this paper has proposed two seismic controls, namely LRB control and NZ control to study the seismic performance of isolated RC building in terms of reduction in responses under four realistic unidirectional earthquakes. The computer codes have been generated in MATLAB 7 ® to analyze the building responses in which equations of motion are solved using Newmark’s method whereas Wen’s model is used to model the bearing force. The responses of isolated building are compared with responses of non-isolated building in terms of time varying displacement, acceleration in addition to peak response of displacement, acceleration and bearing displacement. The results of computer codes illustrate that both the proposed controls yields effective in reducing the responses of isolated building. Further, NZ control is relatively more effectively perform than LRB control in reducing the responses. Keywords: Seismic performance, base isolation system, non-isolated building, isolated building, building responses; LRB control; NZ control I. INTRODUCTION The protection of civil structures against natural hazards becomes one of the challenges to an engineers and researchers as because experiences about hazards during recent past earthquakes. Moreover, to ensure the safety and comfort to the users during natural violence, one has to compel the engineers and scientists to think about innovative techniques and approaches to save the buildings and structures from the destructive forces of earthquakes. The aseismic design philosophy is one of the approaches to control over the earthquake hazard in which controlling devices works on various control techniques such as active, passive and semiactive or its combination [1]. In recent years, considerable attention has been paid for the development of structural control and become an important part of designing new structures to resists the hazardous forces. There have been significant efforts by researchers to investigate the possibilities of using various control methods to mitigate earthquake hazards. Among that one of the most popular as passive control system in which base isolation system is one the prominent control in reducing the structural responses of non-isolated building [2]. The passive controlling devices are activated by structural momentum or motion, therefore no external power supply to develop the counter or control forces but having limitation is, it cannot adapt to varying loading conditions. The main concept of isolation is to increase the fundamental time period of structural vibration beyond the energy containing periods of earthquake ground motion. Thus, passive systems may perform well in pre-described loading conditions for which they were designed but may not be effective in other situations [3]. The passive control devices may attenuate the vibrational energy due to earthquakes either by dissipation or isolation techniques. The passive control system in which base isolation is one of the prominent seismic controlling techniques which works by reflecting the seismic energy input rather than absorbing/dissipating as a result building get decouple from ground motion by deflecting bearing itself [4]. Further base isolation system is categorized into elastomeric base isolation and sliding base isolation. This study is concern to elastomeric base isolation which is further classified into elastomeric base isolation without and with central lead core. The elastomeric base isolation without central lead core is also called as laminated rubber bearing (LRB) whereas elastomeric base isolation with central lead core known as lead rubber bearing (NZ). The laminated rubber bearing (LRB) without central lead core is extensively used in practices under comparatively with low frequency input. The basic components of LRB system are steel and rubber plates built in alternate layers with rubber being vulcanized to the steel plates [5]. The NZ system is same as that of LRB system except central lead core which provides an additional means of RESEARCH ARTICLE OPEN ACCESS