Performance Evaluation of RC Buildings Designed as per Indian Seismic Codes: A Study on Frames with Vertical Geometric Irregularity

  • N. K. ManjulaEmail author
  • Praveen Nagarajan
  • T. M. Madhavan Pillai
Original Contribution


Analyses on RC frames designed as per the Indian standards (IS 1893:2002 and IS 13920:1993 (2008)) and draft proposal (IITK-GSDMA EQ 11 v 4.0, 2008) are done in this paper. Based on the results, certain provisions in the latest codes (IS 1893:2016 and IS 13920:2016) are reviewed. The study is focused on frames with vertical geometric irregularity. However, analyses of regular frames are also done to make certain comparisons. The necessity of strengthening/retrofitting for the buildings located in places whose seismic zones are revised as per IS 1893:2002 is also examined. Regular structures are found to sustain the earthquake events with sufficient safety. The design of regular frames can be made more economic by reducing their design base shear. The column/beam moment-capacity ratio (M.R.) in IS 13920:2016 is found uneconomical for regular frames. Improvements to the design of irregular frames can be made by reducing their response reduction (R) factors and following the M.R. value of 1.4 adopted in the recent code (13920:2016).


Indian Standard Seismic codes Design base shear Vertically irregular frames Strong column–weak beam action Ductile detailing Performance levels 



The authors are thankful to Ministry of Human Resources Development, Govt. of India for Funding this project.


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Copyright information

© The Institution of Engineers (India) 2018

Authors and Affiliations

  • N. K. Manjula
    • 1
    Email author
  • Praveen Nagarajan
    • 1
  • T. M. Madhavan Pillai
    • 1
  1. 1.Civil Engineering DepartmentNational Institute of TechnologyCalicutIndia

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