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International Journal of Civil, Structural,Environmental and Infrastructure EngineeringResearch and Development (IJCSEIERD)ISSN 2249-6866Vol.2, Issue 2 (2012) 25-31 TJPRC Pvt. Ltd.,STUDY OF RESPONSE OF STRUCTURALLY IRREGULAR BUILDINGFRAMES TO SEISMIC EXCITATIONSPOONAM1, ANIL KUMAR1 AND ASHOK K. GUPTA21Senior Lecturers in Civil Engineering, JaypeeUniversity of Information Technology, Waknaghat, Solan (HP)2Professor of Civil Engineering, JaypeeUniversity of Information Technology, Waknaghat, Solan (HP)ABSTRACTThe Indian Standard code IS-1893: 2002 (Part-I) defines a number of structural irregularities. Thecode suggests a different approach of analysis for irregular structures. In this paper, response of a10-storeyed plane frame to lateral loads is studied for mass and stiffness irregularities in the elevation.These irregularities are introduced by changing the properties of the members of the storey underconsideration. Floor-mass ratios ranging from 1 to 5 are considered for mass irregularity. The massirregularity is introduced at different storey levelsfourth and seventh levels. To introduce stiffnessirregularity, the fourth and fifth storeys stiffnesses are reduced to 50% of that of other storeys in the baseframe. Other than the first-storey, other storeys are also given similar stiffness irregularity. Moreover, theeffects of floating columns as well as of unusually tall first storey on the dynamic response are alsostudied. Conclusions are d

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