Buy article PDF
The purchased file will be sent to you
via email after the payment is completed.
US$ 35
|
Computers and Concrete Volume 33, Number 2, February 2024 , pages 147-162 DOI: https://doi.org/10.12989/cac.2024.33.2.147 |
|
|
|
A damage mechanics based random-aggregate mesoscale model for concrete fracture and size effect analysis |
||
Ni Zhen and Xudong Qian
|
||
| Abstract | ||
| 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. | ||
| Key Words | ||
| concrete damage plasticity (CDP) model; fracture failure; mesh sensitivity; mesoscale model; random aggregates | ||
| Address | ||
| Department of Civil and Environmental Engineering, National University of Singapore Block E1A, #07-03, No.1 Engineering Drive 2, Singapore 117576 | ||