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Structural Engineering and Mechanics
  Volume 70, Number 3, May10 2019, pages 303-310

Strengthening of capacity deficient RC beams - An experimental approach
M. Adil Dar, N. Subramanian, A.R. Dar, Amer Iliyas Rather, Mir Atif and Sayeeda Syed

    Any revision of seismic codes usually demands a higher capacity from structural members, making existing structures unsafe particularly from strength considerations. Retrofitting of capacity deficient members is very suitable for tackling such situations. This paper presents an experimental study on different retrofitting measures adopted for strengthening a series of reinforced concrete (RC) beams. Four identical RC beam specimens were casted, out of which three specimens were strengthened by different schemes (viz., bolted hot rolled flat, bolted cold-formed steel channel, and carbon fibre reinforced polymer (CFRP) laminate, respectively) on their tension face and tested under four-point monotonic loading. This study focuses on the investigation of the flexural behaviour of these retrofitted beams, observed in terms of strength and stiffness. It was concluded that all retrofitting measures improved the structural performance of these beams. However, the cost involved with each strengthening mode was proportional to the improvement in the performance achieved.
Key Words
    flexural members; experimental investigation; cold-formed steel; carbon fibre reinforced polymer laminate
1Department of Civil Engineering, Indian Institute of Technology Delhi, New Delhi, India
2Consulting Engineer, Maryland, USA
3Department of Civil Engineering, National Institute of Technology Srinagar, J&K, India

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