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http://dx.doi.org/10.12989/eas.2019.16.2.235

Investigations on the behaviour of corrosion damaged gravity load designed beam-column sub-assemblages under reverse cyclic loading  

Kanchanadevi, A. (CSIR-Structural Engineering Research Centre)
Ramanjaneyulu, K. (CSIR-Structural Engineering Research Centre)
Publication Information
Earthquakes and Structures / v.16, no.2, 2019 , pp. 235-251 More about this Journal
Abstract
Corrosion of reinforcement is the greatest threat to the safety of existing reinforced concrete (RC) structures. Most of the olden structures are gravity load designed (GLD) and are seismically deficient. In present study, investigations are carried out on corrosion damaged GLD beam-column sub-assemblages under reverse cyclic loading, in order to evaluate their seismic performance. Five GLD beam-column sub-assemblage specimens comprising of i) One uncorroded ii) Two corroded iii) One uncorroded strengthened with steel bracket and haunch iv) One corroded strengthened with steel bracket and haunch, are tested under reverse cyclic loading. The performances of these specimens are assessed in terms of hysteretic behaviour, energy dissipation and strength degradation. It is noted that the nature of corrosion i.e. uniform or pitting corrosion and its location have significant influence on the behaviour of corrosion damaged GLD beam-column sub-assemblages. The corroded specimens with localised corrosion pits showed in-cyclic strength degradation. The study also reveals that external strengthening which provides an alternate force path but depends on the strength of the existing reinforcement bars, is able to mitigate the seismic risk of corroded GLD beam-column sub-assemblages to the level of control uncorroded GLD specimen.
Keywords
corrosion; beam-column sub-assemblage; gravity load designed; energy dissipation; hysteretic behaviour; reverse cyclic loading; in-cyclic strength degradation;
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Times Cited By KSCI : 7  (Citation Analysis)
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