EVALUATION OF SEISMIC POUNDING EFFECT ON THE RESPONSE OF RC ADJACENT BUILDINGS WITH PLAN IRREGULARITY

Abstract

Now a day, due to urbanization and growing population, the value of land is increasing from day to day: with this phenomenon, adjacent buildings with different plan are being constructed closely with small gap or no gap to use land effectively. However, construction of adjacent building with insufficient separation distance could lead Pounding, during earthquake may lead building damage. The objective of this study is to evaluate the effect seismic pounding on response of adjacent building with plan irregularity. To perfume the study, three cases of adjacent building with no gap are considered. Case 1 building with different height but with similar regular plan lay out, case 2 building with different height and with different plan layout (regular building in plan combine with irregular E-shape building) and in case 3 building with different height and with different plan (regular building with irregular building of F-shape in plan). Modeling and design are carried out in ETABS 2018 software considering nonlinear gap element model. nonlinear time history analysis is adopted considering El Centro matched to the response spectrum of the site under soil type D as time history function. To show the importance of avoiding pounding in structures the results obtained were compared with model having no pounding phenomena. The results were obtained in the form of point displacement, story drift, story shear, acceleration and pounding force. The acceleration at pounding level significantly increases during collision of building. The generated extra pounding force may cause severe damage to structural members of structures. Pounding produces shear at various story levels, which are greater than those obtained from no pounding case. Building with more height suffers greater damage than shorter building when pounding occurs and the influence is more in buildings as the irregularity in adjacent building is more. Increasing gap distance tends to reduce story shear in consistent manner so that damage in the building is significantly reduced. Therefore, providing necessary separation distance is less cost-effective means of preventing pounding effect.