Effect of creep on the stress-strain relation of fly-ash slag concrete in marine environments

摘要

Lots of concrete structures are located in marine environment, the durability damage of these structures is often the result of the interaction of load, environment, and other factors. In this paper, tests for the stress-strain relation of concrete under the coupled effects of sustained loading, sulfate attack and dry-wet cycle were conducted. Then, based on the damage stress-strain relation model of concrete under sulfate attack, a calculation method for the stress-strain relation of concrete under the action of sulfate attack and dry-wet cycle was proposed. Meanwhile, by taking into account the effect of creep on the stress-strain relation of concrete, a time-dependent stress-strain relation model of concrete was presented. Numerical simulations by the time-dependent stress-strain relation model demonstrate that the calculated results agree well with the experimental data. Furthermore, the rationality and applicability of the time-dependent stress-strain relation model were also discussed.