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
Literature review on Seismic Pounding of Adjacent Buildings Vidhya P Namboothiri1 1MTech
IInd year student, Dept. of Civil Engineering, SreeBuddha College of Engineering, Kerala, India
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Abstract - Structures are built close to each other in various
be catastrophic and more dangerous than the effect of earthquake on a single building.
cities and urban areas where cost of land is high and availability of land is difficult. Due to this closeness, the structures may collide with each other when subjected to any vibration or earthquake. This collision of buildings or its different parts during the vibration is called pounding which result in architectural and structural damages or collapse of the entire structure. The difference in structural properties, floor height and floor level with insufficient gap between the buildings also effects in structural pounding. Here, a discussion of previous works and studies regarding the structural pounding, its causes and the mitigation measures is given.
1.1 Causes of Pounding The various causes of pounding are as follows: Adjacent buildings with the same heights and the same door levels Adjacent buildings with same floor levels but different heights Adjacent structures with different total height and floor levels Structures are situated in a row Adjacent units of the same buildings which are connected by one or more bridges or through expansion joints. Structures having different dynamic characteristics, which are separated by a distance small enough so that pounding can occur. Pounding occurres at the unsupported part (e.g., mid-height) of column or wall. Construction according to the earlier code that was vague on separation distance. Possible settlement and rocking of the structures located on soft soils. Buildings having irregular lateral load resisting systems in plan rotate during an earthquake
Key Words: Structural pounding, Building collision, Adjacent buildings, Seismic separation distance, Pounding analysis
1.INTRODUCTION The Seismic Pounding can be defined as the collision of adjacent buildings during the earthquakes. The principle reason for the pounding effect is the insufficient gap in between the adjacent buildings. It is one of the main causes of severe building damages in earthquake. The nonstructural damage involves pounding or movement across separation joints between adjacent structures. Seismic pounding between two adjacent buildings occur during an earthquake when adjacent buildings of different dynamic characteristics vibrate out of phase at-rest separation is insufficient. A separation joint is the distance between two different building structures – often two wings of the same facility that allows the structures to move independently of one another.
Fig-1: Pounding of Adjacent Buildings
Also, Poundings may occur because of structural irregularities. For example eccentricity between mass rigidity centers cause torsion in the structure. Pounding is very complex phenomenon. It could lead to infill wall damage, plastic deformation, column shear failure, local crushing and possible collapse of the structure. Adjacent structures with different floor levels are more vulnerable when subjected to seismic pounding due to additional shear forces on the columns causing more damage and instability to the building. The patterns of the damage vary from minor and architectural damages to major structural damages to even total loss of the building function and its stability. In other words, pounding phenomena in adjacent buildings can
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Impact Factor value: 5.181
Fig-2 : a) Similar seismic behaviour b) Different seismic behavior
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