STUDY ON THE MECHANICAL PROPERTIES OF CORRODED UNBONDED PC STEEL STRAND

Based on the accelerated corrosion testing, mechanical properties of Unbonded RC. steel strand corroded were studied, affection of corrosion on nominal ultimate strength, nominal elastic modulus and elongation of steel strand was analyzed in different corrosion environment and conditions, mathematical expression of corrosion ratio and nominal ultimate strength, nominal elastic modulus, elongation of steel strand were built, corrosion steel strand stress-strain constitutive relation was further put forward. the causes of steel strand sensitive to carrion were further analyzed, the corrosion and damage analysis model and damage thresholds of steel strand was put forward, the experiment and research of the thesis lay foundation for durability evaluation of Unbonded P.C. steel strand.