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Authors
Affiliations
1 Government Polytechnic Maem, Bicholim, Goa, IN
2 B.V. Bhoomaraddi College of Engineering and Technology, Vidyanagar, Hubli, Karnataka, IN
Source
International Journal of Engineering Research, Vol 5, No SP 3 (2016), Pagination: 658-664
Abstract
Reinforced concrete buildings represent major type of concrete structures all over the world. It is observed from the past major earthquakes in India, Turkey, China,Nepal and other countries, numerous medium to high rise buildings suffered major damages including life and safety of people. This clearly implies that the design capacity of buildings designed as per codes was not enough to withstand earthquake demand. In the regions of high seismic activity,safety of these buildings occupying major population is of growing concern, as most of them are seismically deficient, as many low to medium rise buildings are designed only for gravity loading, or they are designed for earthquake forces by performing elastic analysis. When elastic analysis is performed, building structure is assumed as a linear system.This analysis is sufficed to withstand mild earthquakes but a major earthquake is expected to cause significant structural damage resulting in loss of structural stiffness. A linear elastic analysis is not applicable in this situation since these analyses do not account for change in structural properties nor they give any idea about the location and extent of damage or in elasticity. The true response is therefore determined only by non-linear analysis considering the changing stiffness of the various members and moment distribution, when structures are subjected to moderate or major earthquakes. Thus to mitigate the effects of future earthquake damages, the seismic design should be carried out incorporating non-linear analyses to calculate structural response in order to assess and design seismic retrofit solutions for existing buildings and design new buildings based on above approach. In the present study three different building models are designed for critical load combinations by considering lateral Earthquake load by Equivalent Static Analysis (ESA) and Response spectrum analysis (RSA) and then pushover analysis is carried out to assess their performance. The performance of building models, displacements corresponding to performance point (PP), and hinging pattern at PP are presented and studied. It is concluded that ESA method of analysis has satisfactory performance and RSA method of analysis design exhibits over strength using pushover analysis method for evaluation.
Keywords
Pushover Analysis, Performance Point.
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