Response of Concrete to Dynamic Elevated-Amplitude Cyclic Tension

Abstract

A universal testing machine was used to test the behavior of concrete subjected to cyclically varying load whose amplitude was constantly increasing. How concrete's dynamic strength has been affected by the rate of amplitude increment per loading cycle, cycle frequency, and initial static loading intensity has been studied. It was found that in concrete subjected to cyclically varying loading's strength enhancement, an important role was played by each cycle maximum loading rate in the frequency range of earthquake excitation. The amplitude increment rate's influence is insignificant. The authors present a formula for strength enhancement prediction of concrete which has been subjected to cyclically varying load based on monotonic loading test results. That concrete subjected to carrying cyclic loading's strength enhancement showed a tendency, with increasing initial static loading, to decrease, was revealed through experimental results. Unrecoverable plastic deformation magnifies along with loading cycle growth.