A STRESS DAMAGE ASSESSMENT METHOD OF STEEL BARS IN CONCRETE STRUCTURES BASED ON MMM

Lei Liu,∗,∗∗ Qianwen Xia,∗ Ya Li,∗ and Yinghao Qu∗

Keywords

Reinforced concrete structure, tensile steel bars, stress damage,metal magnetic memory, assessment

Abstract

To realize the assessment of the stress damage of the tensile steel bars in concrete structures, a metal magnetic memory (MMM) signals acquisition experiment of the concrete rectangular beams subjected to increasing and decreasing loads was carried out. A new parameter called “difference of deviation rate curve (dDr) was proposed to evaluate the stress damage of tensile steel bars in the test beams. Experimental results revealed that the change laws of MMM signals did not coincide during the loading and unloading process, and the MMM signals of different specimens deviated to different degrees after unloading. Importantly, the parameter “dDr successfully realized the stress damage assessment of tensile steel bars in the test beams. The results of this paper can effectively provide a basis for the damage assessment of tensile steel bars in concrete structures.

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