Seismic performance of soft storey rc frames at different storey levels from pushover analysis

Kamath, Kiran and Kalibhat, Madhusudan G and Prasad, S K and Pai, Ramya R (2014) Seismic performance of soft storey rc frames at different storey levels from pushover analysis. IOSR Journal of Mechanical and Civil Engineering (IOSR-JMCE). pp. 7-13. ISSN 2278-1684

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Soft storey collapse is one of the reasons for failure of framed structures during an event of an earthquake. Such irregularities are highly undesirable in the buildings built in earthquake prone areas. In such buildings, the stiffness of the lateral load resisting systems at that storey is quite less compared to other storeys.Pushover analysis is a nonlinear static approach for the seismic analysis of structures subjected to permanent vertical load and gradually increasing lateral load at very large strains up to failure. Considering these aspects in mind, the present work focuses on the seismic performance of soft storey Reinforced Concrete (RC) frames using pushover analysis. For this purpose, ETABS, finite element software has been used. Typical two dimensional RC frames having soft storey are modeled and their seismic performance with varying stiffness ratio at different storey levels have been evaluated using pushover curves. Base shear carried, roof displacement experienced, status of performance point and number & status of hinges formed are the parameters used to quantify the performance of RC frames.It is inferred that structures with soft storey are most vulnerable to seismic excitation. They possess lower lateral load carrying capacity and experience increased roof displacement.

Item Type: Article
Uncontrolled Keywords: -Pushover analysis,Plastic hinge, RC frames, Soft storey, Stiffness ratio
Subjects: Engineering > MIT Manipal > Civil Engineering
Depositing User: MIT Library
Date Deposited: 30 Jun 2014 05:04
Last Modified: 30 Jun 2014 05:04

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