Title:
Response of Concrete to Dynamic Elevated-Amplitude Cyclic Tension
Author(s):
Gao Lin, Dongming Yan, and Ying Yuan
Publication:
Materials Journal
Volume:
104
Issue:
6
Appears on pages(s):
561-566
Keywords:
cyclic load; dynamic strength; strength enhancement
DOI:
10.14359/18959
Date:
11/1/2007
Abstract:
Concrete behavior subjected to cyclically varying load with constantly increasing amplitude was tested on a universal testing machine. The effect of initial static loading intensity, cycle frequency, and the rate of amplitude increment per loading cycle on the dynamic strength of concrete has been studied. It was found that in the frequency range of earthquake excitation, the maximum loading rate of each cycle plays an important role in the strength enhancement of concrete subjected to cyclically varying loading. The influence of the rate of amplitude increment is insignificant. A formula is presented to predict the strength enhancement of concrete subjected to cyclically varying load based on the results of a monotonic loading test. In addition, experimental results reveal that the strength enhancement of concrete subjected to varying cyclic loading showed a tendency to decrease with increasing initial static loading. Along with the growth of loading cycles, the unrecoverable plastic deformation magnifies.