University of Cambridge > > Engineering Department Structures Research Seminars > Computational modelling of reinforced concrete members with peridynamics.

Computational modelling of reinforced concrete members with peridynamics.

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There is a pressing need to address the overdesign of reinforced concrete structures. The utilisation of structural concrete members is often very low and structural material wastage in the order of 50% is common. Using fabric formwork, it is possible to design and build optimised non-prismatic concrete members that use up to 40% less concrete than prismatic members of equivalent strength. Ensuring the safety and reliability of highly efficient structural members requires accurate analysis methods. Predicting the shear behaviour of reinforced concrete members is notoriously difficult and codified design methods are generally based on empirical formulas derived from the testing of prismatic beams. Non-prismatic members fall outside of conventional design codes and current methods for determining their structural response and ultimate limit state behaviour are inadequate. Robust and accurate numerical models are needed for predicting the behaviour of optimised reinforced concrete structural members. This work utilises the peridynamic theory of solid mechanics to develop numerical models for the analysis of three-dimensional reinforced concrete members. The peridynamic theory does not include spatial derivatives and remains valid across discontinuities, allowing for the natural inclusion of fracture behaviour. The presented work examines the suitability of numerical models based on the peridynamic theory for simulating the complex ultimate limit state behaviour of reinforced concrete, when little or no a priori knowledge is available on possible fracture behaviour. The developed numerical model is applied to the simulation of reinforced concrete members failing in flexure and shear. It is demonstrated that the numerical model can capture the failure mode and load capacity of reinforced concrete members and the observed fracture behaviour is generally in agreement with experimental results. Using only a simple linear damage model it is possible to simulate different types of shear failure in reinforced members.

This talk is part of the Engineering Department Structures Research Seminars series.

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