Mesoscopic discrete modeling of multiaxial load-induced thermal strain of concrete at high temperature

Lei Shen*, Huayi Zhang, Giovanni Di Luzio, Hao Yin, Lifu Yang, Gianluca Cusatis

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


This work presents a mesoscopic discrete model of load-induced thermal strain (LITS) as part of the Lattice Discrete Particle Model at high temperature (LDPM-HT) that captures the experimentally observed deformations and mechanical responses of concrete heating up to 800 °C under multiaxial loads. In the proposed model, the LITS is decoupled into elastic strain increment due to thermal degradation, and thermo-mechanical strain at the mesoscale. As the most important component, the mesoscopic thermo-mechanical strain is decomposed into a normal and two shear components. The normal component in compression of the thermo-mechanical deformation at the mesoscale controls the macroscopic LITS in the load direction, while the mesoscopic thermo-mechanical strain components in normal tension and shear directions dominate the macroscopic LITS in the unloaded directions. The correctness and accuracy of the improved LDPM-HT are demonstrated by simulating two experimental investigations, namely a heating test up to 800 °C with uniaxial load and a heating test up to 250 °C with multiaxial loads.

Original languageEnglish (US)
Article number107613
JournalInternational Journal of Mechanical Sciences
StatePublished - Oct 15 2022


  • High temperature
  • Lattice discrete particle model
  • Load-induced thermal strain
  • Multiaxial loading
  • Transient thermal creep

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Aerospace Engineering
  • Ocean Engineering
  • Applied Mathematics
  • Materials Science(all)
  • Civil and Structural Engineering


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