International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395 -0056
Volume: 04 Issue: 02 | Feb -2017
p-ISSN: 2395-0072
www.irjet.net
SEISMIC POUNDING EFFECTS ON ADJACENT TALL BUILDINGS – A REVIEW Nishath P.V 1, Abhilash P.P 2 1PG Student, 2
Department of Civil Engineering, Sreepathy Institute of Management And Technology, Vavanoor, India Assistant Professor, Department of Civil Engineering, Sreepathy Institute of Management And Technology, Vavanoor, India
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Abstract - From the past and present investigations of earthquakes, seismologists have shown that, during earthquake, the building structures are vulnerable to severe damages. The adjacent buildings collide and collapse during moderate to strong ground vibrations. Collision of two building which are of different dynamic characteristics is called as seismic pounding and this is a commonly observed phenomenon during a seismic event in metropolitan cities. In order to prevent this failure, the seismic gap between the structures must be sufficient to let structural displacements during strong ground motions. But sometimes availability of required safe separation gap is not possible in metropolitan cities due to high land value and limited availability of land. This paper deals with a systematic study regarding the pounding effects in RC buildings without sufficient seismic gap as well as its mitigation practices. Key Words: Seismic pounding, Seismic gap, Gap element, Mid-column pounding, Mitigation.
1 INTRODUCTION The demand for the space is increasing day by day due to the fast growing construction industry across the globe. In metropolitan cities, due to lack of availability of space, buildings are constructed very close to each other and which leads to a phenomenon called “Seismic Pounding” (Fig.1).If floors of one building hit at the mid height of columns in the other building, pounding effect may be much more serious (Mid-column pounding) .The simplest and most appropriate way for pounding mitigation is to provide safe separation gap. But in metropolitan cities it is tough to fulfill it due to high land value and non-availability of the land. This paper is focusing to evaluate the effects of structural pounding on the global response of building; to determine proper seismic hazard mitigation practice for already existing buildings as well as new buildings. Decreasing lateral displacement by introducing the stiffeners like RC walls, Bracings, dampers etc, is an alternative to the seismic separation gap provision in the structure design.
Fig 1 pounding Phenomenon (source: Ref [4])
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