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Applicant:
Indian Institute of Technology (IIT) Roorkee 
Title:
A system and method for seismic retrofitting of severely damaged reinforced concrete frame buildings using coupler-box section 
Inventor(s):
Pankaj Agrawal, K.V Naveen Kumar and Dr. R.Siva Chidambaram 
Applicant:
Indian Institute of Technology (IIT) Roorkee 
Application type:
Applied - 2020-02-24 
Application Number:
202011007735 
Applied at:
India 
Entered by:
Indian Institute of Technology (IIT) Roorkee 
Abstract:
The present invention relates to a system and method for seismic retrofitting of severely damaged reinforced concrete frame buildings using coupler-box section. An innovative retrofitting technique for damaged RC column members at their plastic hinge locations using proposed hybrid rebar coupling sleeves and box confinement using flat steel bars is provided. The hybrid rebar coupler/ coupling sleeve adopting frictional, mechanical and grouting techniques with additional edge bolts arrangement in interlinking two rebar segments is disclosed herein. The proposed methodology offers retrofitting for multiple number of damaged/ ruptured rebars by re-connecting them using proposed sleeves and interlinking those sleeves using flat steel bars to form a box confinement, which enhances the strength and ductility of re-established structural section in comparison with the original section. 

 
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