Abstract
The strengthening of damaged concrete structures using new cementitious composites such as high-performance fiber-reinforced cementitious composites (HPFRCC) with proper strain hardening behavior under cyclic loads is a suitable solution for economic utilization of RC structures. In this paper, the technique and results of strengthening the damaged and undamaged frames with HPFRCC composite thin layer subjected to lateral and gravity loads are presented. Experimental program includes four frames, one unstrengthened and undamaged frame as reference, one strengthened undamaged frame, and two strengthened partially damaged (with initial 55 and 75 percentage of ultimate load), and they were tested under both vertical and lateral loads. The results indicated that the ductility of two strengthened frames with initial 55, 75% damage of the maximum load and the undamaged strengthened frame was up to 110, 60, and 121% more than that of reference frame, respectively. The yielding loads of the tension bars at the strengthened damaged and undamaged specimens had been significantly increased up to 42%, and ultimate loads of the undamaged and two damaged frames (55, 75%) were increased up to 38 and 35, 16% compared to the reference frame; energy absorption in three same frames was 2.37, 2.75, 1.83 times of that of unstrengthened reference frame.
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Acknowledgements
This research was financially supported by the Research Deputy of Semnan University in Iran. The authors would like to express their gratitude to Mr. Mohazen and technical staff of Faculty of Civil Engineering particularly to Mr. Bakhshahi.
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Parsa, E., Sharbatdar, M.K. & Kheyroddin, A. Investigation of the Flexural Behavior of RC Frames Strengthened with HPFRCC Subjected to Lateral Loads. Iran J Sci Technol Trans Civ Eng 43, 231–240 (2019). https://doi.org/10.1007/s40996-018-0133-0
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DOI: https://doi.org/10.1007/s40996-018-0133-0