Title: Study on Residual Strains of Concrete under Cyclic Loading and Unloading

Author(s): Zhenhua Chen, Shiqiang Mei and Lingling Liu

Publication: China Concrete and Cement Products

Volume:

Issue: No.3 2010(Total 173)

Appears on pages(s): 48-51

Keywords: Steel fiber concrete, Cyclic loading and unloading, Dynamic, Residual strains

DOI:

Date: 6/20/2010

Abstract:
The equidifferent strain incremental cyclic loading and unloading tests with the strain rates at 10-3/s are taken for the cylinder concrete samples with the steel fiber content of 0%、1.5%、2.0%、2.5%、3.0%.The test results show that in the initial four cyclic loading and unloading tests,residual strains at the reloading points of steel fiber concrete of 25 grade（SFC25） are least in five kinds of concrete,and the residual strains of other four concrete are decreasd with the increase of steel fiber content.In the following tests,the residual strains of five kinds of concrete are decreased while the steel fiber content is increased,and the total residual strains of the five kinds of steel fiber concrete are decreased in turn by 0.0929%、0.095%、0.0355%、0.1469%,which compare with the former ones at last.The residual strains of each cycle are increased rapidly in initial four cyclic loading and unloading tests,then in the following tests,the residual strains are increased not clearly and keep at a constant value.The residual strains of five kinds of steel fiber concrete in each loading and unloading cycle are decreased as the steel fiber content are increased in the whole test process.
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