A STUDY OF SEISMIC POUNDING EFFECT BETWEEN ADJACENT BUILDINGS AND ITS MITIGATION BY USING DIFFERENT TYPE OF BRACING SYSTEMS

Ravindranatha, Pradeep Karanth, Shivananda S.M, H.L Suresh

Abstract: Investigation of previous and recent earthquake damage have shown that the buildings are subjected to severe destruction or collapse during the earthquake ground motion. Among the probable structural damages, seismically induced pounding has been usually witnessed in most of the earthquakes. During the earthquake, Building vibrates out phase due there different dynamics characteristics. Such buildings are usually separated by expansion joint which is insufficient to accommodate the lateral movements of the buildings during the earthquake. Seismic pounding can be prevented by providing safe separation distances; sometimes availability of required safe separation gap is not possible in metropolitan cities due to high land value and limited availability of land. If building separation is found to be deficient to prevent pounding, then there should be some easy and costeffective methods to prevent structural pounding between adjacent buildings. This study covers the effect of structural pounding on conventional beam column system adjacent to flat slab system .In order to observe pounding effect, Time history analysis is carried out by taking 1944 Elcentro earthquake data which is to be known as above average earthquake. This study also covers the prevention techniques of pounding by using retrofitting’s like introducing X cross bracings, Eccen forward and backward cross bracing, V cross bracing systems with proper placement are proposed as possible mitigation techniques for pounding between adjacent structures.

Keywords: Seismic pounding, Earthquake, SAP 2000, Flat slab, Bracing

DOI: https://doi.org/10.15623/ijret.2016.0516001