Suggested Modification of Japanese Seismic Evaluation Standard and Retrofit Design Guidelines for Existing RC Buildings for Its Application in Bangladesh


Abstract eng:
Present Bangladesh National Building Code (BNBC) 1993 became mandatory in 2006. Most of the buildings constructed before 2006 were designed without the consideration of seismic loads. Since there are no clear regulations both in BNBC1993 and recent BNBC 2015 final draft, the practice of the Japanese Standard of Seismic Evaluation and Guidelines of Retrofit Design for existing RC buildings 2001 by JBDPA has been studied. The basic idea of the Japanese method is that, the seismic index of structure Is is calculated for each story and each principal direction, and compared with the seismic demand index Iso. This seismic index of structure Is is composed of strength index C, ductility index F, irregularity index S D and others. As an actual result, more than 50,000 public school buildings in Japan have been retrofitted up to the present based on the Standard and the Guidelines. Suggested modification in Bangladesh is, i) Seismic demand index Iso based on a time-history response analysis incorporating the design seismic load of BNBC 2015 final draft. ii) Ductility index F and strength index C incorporating the local design and construction practices. iii) Scope of application and others. As a result, 80% of the elastic response shear force coefficient of BNBC 2015 final draft is proposed as the Iso. For example, mid to low-rise buildings with the value of usage index 1.0 in Dhaka, Iso = 0.30 for soil type SC (hard soil) and 0.36 for soil type SD (soft soil) respectively. In Sylhet, Iso = 0.55 and 0.65 respectively. Suggested modification has been developed as the application manuals. It is expected that these application manuals are utilized and disseminated for the seismic assessment and retrofit design, which will enhance the seismic performance of existing RC buildings in Bangladesh. This study has been done as a part of the technical cooperation project (CNCRP) between PWD (Bangladesh) and JICA.

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Conference Title:
Conference Title:
16th World Conference on Earthquake Engineering
Conference Venue:
Santiago (CL)
Conference Dates:
2017-01-09 / 2017-01-13
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 Record created 2017-01-18, last modified 2017-01-18


Original version of the author's contribution as presented on USB, paper 551.:
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