The research described in this paper investigates the influence of tensile strain on lateral buckling in reinforced concrete seismic walls having an ultra high longitudinal reinforcement ratio. The present work is experimental. In the framework of the present research, 5 test column specimens of scale 1:3 simulating the extreme areas of ultra highly reinforced concrete walls were used. The test columns are of identical proportions and reinforcement content, with the only variable being the applied load history. All specimens were reinforced with the same ultra high longitudinal reinforcement ratio (6.03%) which was bigger than the maximum value prescribed by Codes. This was done deliberately for experimental reasons. The degree of tensile strain which was applied was different for each specimen and it took values equal to 0‰, 10‰, 20‰, 30‰ and 50‰. The present paper tries to investigate the influence of the degree of tensile strain to the ultimate bearing capacity of test specimens. Based on the results, it is apparent that the amount of tensile strain that reinforcing bars within the extreme areas of concrete walls are subjected to directly affects the buckling phenomena upon reversal of loading.
Department of Civil Engineering, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece.
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