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The IUP Journal of Structural Engineering :
Seismic Evaluation of Masonry Buildings with Flexible Diaphragm: A Performance-Based Approach
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The present work investigates the seismic evaluation of Unreinforced Masonry (URM) building when subjected to seismic (lateral) loading. The Federal emergency management agency published a performance-based design code FEMA-356 (2000). In the present work, performance analysis procedures proposed by FEMA-356 (2000) are applied to a typical URM shear wall building and the results are compared with that of a modified analysis proposed by the researchers. These procedures are also performed for a set of seismic zones suggested by IS:1893(2002).

 
 

About 90% of the buildings present in India are masonry structures. Masonry structures are the most common types of structures used since ages. Nowadays, such type of constructions is commonly employed in rural regions, since it is economical and accommodates itself according to prevailing environmental conditions. It has been observed that under the impact of moderate to severe earthquake occurrences (Bihar 1988, Killari 1993, Chamoli 1999, Bhuj 2001, Andaman 2002, Sumatra 2004, Jammu and Kashmir 2005, Sikkim 2006), the masonry buildings performed the worst, causing the largest loss of lives and the properties of the residents. Thus, in order to save the life of people due to collapse of such buildings during earthquake, it is required to make them earthquake-resistant. For existing buildings, seismic retrofitting is needed. The first step before actual retrofitting is an assessment of the seismic resistance of the existing buildings. Nonlinear analyses of Unreinforced Masonry (URM) buildings and wall components have been conducted in different parts of the world in order to investigate the rehabilitation requirements of such buildings. The main objectives of the paper are: (i) To validate a procedure for performance of existing masonry buildings; and (ii) To perform pushover analysis on the validated masonry building in order to assess its performance for different cities (different seismic zones) in India.

 
 

Structural Engineering Journal, Seismic evaluation, Unreinforced Masonry (URM) wall, FEMA-356 (2000), Performance-based analysis, Masonry property