1. bookVolume 26 (2021): Issue 3 (September 2021)
Journal Details
First Published
19 Apr 2013
Publication timeframe
4 times per year
access type Open Access

Probabilistic Mesoscale Analysis of Concrete Beams Subjected to Flexure

Published Online: 26 Aug 2021
Page range: 12 - 27
Received: 17 Jan 2021
Accepted: 14 Apr 2021
Journal Details
First Published
19 Apr 2013
Publication timeframe
4 times per year

In this paper, the probabilistic behavior of plain concrete beams subjected to flexure is studied using a continuous mesoscale model. The model is two-dimensional where aggregate and mortar are treated as separate constituents having their own characteristic properties. The aggregate is represented as ellipses and generated under prescribed grading curves. Ellipses are randomly placed so it requires probabilistic analysis for model using the Monte Carlo simulation with 20 realizations to represent geometry uncertainty. The nonlinear behavior is simulated with an isotropic damage model for the mortar, while the aggregate is assumed to be elastic. The isotropic damage model softening behavior is defined in terms of fracture mechanics parameters. This damage model is compared with the fixed crack model in macroscale study before using it in the mesoscale model. Then, it is used in the mesoscale model to simulate flexure test and compared to experimental data and shows a good agreement. The probabilistic behavior of the model response is presented through the standard deviation, moment parameters and cumulative probability density functions in different loading stages. It shows variation of the probabilistic characteristics between pre-peak and post-peak behaviour of load-CMOD curves.


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