Abstract
The stiffness of concrete members and the free energy of material degenerate under the continuous temperature change, and the strain error exists. In order to solve the above mentioned problems, Early-age concrete strain error detecting method under continuous temperature change is proposed. Through accurate measurement of concrete strain error, the nonlinear creep model of early age concrete structure under continuous temperature change is deduced. The coupling relationship between material stress and creep is quantitatively analysed to improve the strength of concrete. A method for detecting early age concrete strain error under continuous temperature change based on concrete splitting tensile strength microscopic analysis and low cycle fatigue test is proposed. The nonlinear relationship model of concrete strain amplitude and the number of fatigue cycles under continuous temperature is established. Considering constraint parameters of concrete such as buckling, fatigue and strength, concrete constitutive model is constructed. Test results show that the method used to detect early age concrete strain error under continuous temperature change has better reliability and strain error test results and experimental results are in good consistency.
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