User-defined material model for steel fibre reinforced concrete (SFRC)

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User-defined material model for steel fibre reinforced concrete (SFRC)

A new custom material model for steel fibre reinforced concrete has been developed as a user material law in ANSYS simulation software. The material model has the form of the hyperbolic Drucker–Prager yield criterion. Representation of the steel fibre reinforced concrete behaviour in tension is provided by trilinear softening function. The material model takes into account thermal dependency.

For the integration of the constitutive relations, the Closest Point Projection numerical method is used as a return mapping algorithm. Improvements have been performed for the numerical stability. The algorithm has been written in the C++ programming language and integrated using ANSYS User Programmable Features (UPFs).

The material model was applied for the analysis of the timber steel-fibre-reinforced concrete floor slabs subjected to fire.


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