Title:
Best Practices for Verifying and Validating Complex Non-Linear Finite Element Models of Concrete Structures
Author(s):
Robert MacNeill
Publication:
Web Session
Volume:
ws_F24_MacNeill.pdf
Issue:
Appears on pages(s):
Keywords:
DOI:
Date:
11/3/2024
Abstract:
Nonlinear analysis requires enhanced rigor to ensure accurate predictions of physical phenomena. Consistently applying established best practices informed by accumulated engineering analysts’ experience is critical. Best practices can be applied to modeling methodologies like the meshing approach, element choice, and constraint/load application techniques. Another vital consideration is the material modeling approach. Nonlinear concrete response can be complicated to model, especially on an application-specific basis. Choosing an appropriate constitutive model is a fundamental decision for the analyst. Populating the model with proper inputs is equally essential. Concrete properties can be highly variable. For example, two materials with similar unconfined compressive stress can behave differently under confined pressures. For practical problems, the accuracy of predicted nonlinear concrete response is highly dependent on a wide range of model inputs. Typically, analysts are limited to unconfined compression test and sample weight data, which do not sufficiently characterize the material. We can make rule-of-thumb assumptions about tensile strength to refine the model further. Depending on the loading environment, we may need to better characterize the tensile strength or understand how the material responds under confined pressures, cyclic loading, or at high strain rates. Additional material tests may be necessary, depending on the model fidelity required for the problem. This presentation will highlight some key considerations for applying best practices for nonlinear concrete modeling and identifying situations that may require extra testing to improve model response accuracy.