Computers and Concrete

  • 제33권2호
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  • Pages.147-162
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  • 2024
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  • 1598-8198(pISSN)
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  • 1598-818X(eISSN)
테크노프레스 (Techno-Press)
권호 표지
DOI QR코드

DOI QR Code

A damage mechanics based random-aggregate mesoscale model for concrete fracture and size effect analysis

  • Ni Zhen (Department of Civil and Environmental Engineering, National University of Singapore) ;
  • Xudong Qian (Department of Civil and Environmental Engineering, National University of Singapore)
  • 투고 : 2022.08.16
  • 심사 : 2023.09.05
  • 발행 : 2024.02.25
⟨ 이전 논문 다음 논문 ⟩

초록

This study presents a random-aggregate mesoscale model integrating the random distribution of the coarse aggerates and the damage mechanics of the mortar and interfacial transition zone (ITZ). This mesoscale model can generate the random distribution of the coarse aggregates according to the prescribed particle size distribution which enables the automation of the current methodology with different coarse aggregates' distribution. The main innovation of this work is to propose the "correction factor" to eliminate the dimensionally dependent mesh sensitivity of the concrete damaged plasticity (CDP) model. After implementing the correction factor through the user-defined subroutine in the randomly meshed mesoscale model, the predicted fracture resistance is in good agreement with the average experimental results of a series of geometrically similar single-edge-notched beams (SENB) concrete specimens. The simulated cracking pattern is also more realistic than the conventional concrete material models. The proposed random-aggregate mesoscale model hence demonstrates its validity in the application of concrete fracture failure and statistical size effect analysis.

키워드

참고문헌

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