Uniaxial static stress estimation for concrete structures using digital image correlation

Junhwa Lee, Eun Jin Kim, Seongwoo Gwon, Soojin Cho, Sung Han Sim

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

This paper proposes a static stress estimation method for concrete structures, using the stress relaxation method (SRM) in conjunction with digital image correlation (DIC). The proposed method initially requires a small hole to be drilled in the concrete surface to induce stress relaxation around the hole and, consequently, a displacement field. DIC measures this displacement field by comparing digital images taken before and after the hole-drilling. The stress level in the concrete structure is then determined by solving an optimization problem, designed to minimize the difference between the displacement fields from DIC and the one from a numerical model. Compared to the pointwise measurements by strain gauges, the full-field displacement obtained by DIC provides a larger amount of data, leading to a more accurate estimation. Our theoretical results were experimentally validated using concrete specimens, demonstrating the efficacy of the proposed method.

Original languageEnglish
Article number319
JournalSensors
Volume19
Issue number2
DOIs
StatePublished - 2 Jan 2019

Keywords

  • Concrete
  • Digital image correlation
  • Stress relaxation method

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