270 / 2022-09-18 20:28:37

Thermo-hydro-mechanical Analysis of Saturation-dependent Creep Behavior for RC Beam under Sustained Load and Wet-dry Cycles

Creep development; Wet-dry cycles; Moisture transmission; Inhomogeneous shrinkage; Crack

Abstract In order to study the deflection variation law of concrete beams under dry and wet varying environments, this paper uses a combination of experiments and numerical calculations to reveal the development mechanism of creep under dry-wet environments. Based on hydro-thermal analysis combined with the effect of cracks on moisture transport to calculate the internal pore saturation of concrete, the local creep coefficient is influenced by the local saturation. And combined with the structural inhomogeneous drying shrinkage to obtain the deformation law of the beam during the dry-wet cycles. The study shows that in general, the creep deformation increases as the period of the cycle increases and increases as the drying humidity decreases, but the uneven shrinkage of the beam during drying caused by the bottom crack will lead to a certain degree of upwarping of the beam.