Finite-element modelling of the conservation effects of an artificial resin on deteriorated heterogeneous sandstone in building restoration |
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| Authors: | J Bossert J O?bolt G Grassegger |
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| Institution: | (1) Institute of Construction Materials, University of Stuttgart, Germany;(2) Otto-Graf-Institut—Research and Testing Establishment for Materials and Structures, Department 32 - Maintenance and Restoration of Historical Monuments, University of Stuttgart, Germany |
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| Abstract: | Besides experimental investigations related to the strengthening effects of resins to natural stone, there have been hardly any numerical simulations conducted to the effects of the conservation on the mechanical behaviour of conserved objects. In the present study a three-dimensional finite element code MASA was used to investigate the influence of the conservation procedure on the mechanical properties of the natural stone. The finite element code is based on the microplane material model. As a localization limiter the crack band method was used. A typical profile of sandstone resembling parts of a sculpture—with scaling, sandy decay and sound zones was discretized by solid finite elements. Varied were material properties, temperature distribution over the depth of the specimen, cyclic effects due to the temperature variation and geometry of the specimen. Numerical results show that as a consequence of change of material properties after conservation procedure the cracks can be generated under environmental conditions that are most likely possible in practice. This is especially true for extreme temperature gradients, for repeated temperature conditions (cyclic loading) and for complex geometries. The numerical results have been partly verified by experiments. |
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