Over-nonlocal gradient enhanced plastic-damage model for concrete |
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Authors: | Leong Hien Poh Somsak Swaddiwudhipong |
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Affiliation: | Department of Civil Engineering, National University of Singapore, E1A-07-03, 1 Engineering Drive 2, Singapore 119260, Singapore |
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Abstract: | Classical continuum models exhibit strong mesh dependency during softening. One method to regularize the problem is to introduce a length scale parameter via the nonlocal formulation. However, standard nonlocal enhancement (either by integral or gradient formulation) may serve only as a partial localization limiter for many material models. The “over-nonlocal” formulation, where the weight for the nonlocal value is greater than unity and the excesses compensated by assigning a negative weight to the local value, is able to fully regularize certain material models when standard nonlocal enhancement fails to do so. A plastic-damage model for concrete is formulated with this over-nonlocal enhancement via the gradient approach and the full regularizing capabilities demonstrated. |
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