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Numerical Simulation of the Response of Fire Exposed Concrete StructureThe proposed numerical model for concrete and reinforced concrete structures subjected to fire comprises the transient thermal and mechanical analysis considering the temperature dependent material properties of concrete and reinforcing steel within the framework of the phenomenological approach of the Eurocode 2, part 1-2. A concrete model, based on the combination of plasticity and damage theory, serves as the basis for the material model of concrete for high temperatures. For reinforcing steel a standard elastic-plastic material model is employed. The proposed model is validated by the numerical simulation of fire tests on plain concrete specimens and by the numerical simulation of a large scale fire test on a reinforced concrete slab. Furthermore it is used to determine the structural integrity of a tunnel structure, put up by the cut-and-cover method, exposed to fire.

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We present a novel formulation of the data structure needed for finite elements (FE) in a data model based on the mathematics of fiber bundles. This formulation allows integrating of FE data into a context of generic data processing operations, in particular tools for multivariate data visualization. Our approach is showcased using a real-world application dataset describing drying concrete. Total stress, displacement, mean stress and drying shrinkage strain are illustrated, combining direct visualization methods for scalar-, vector-and tensor fields. Eventually this approach allows for new insights into these rather complex and otherwise opaque FE datasets and supports optimizing the underlying simulations code.