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- W156743802 abstract "When a concrete wall is in any way prevented from free movement, the wall is restrained and restraint forces appear. Restraints could be either external, e.g. due to a connecting slab, or internal, e.g. due to reinforcement. A need for movement is generated, besides from external loading, from intrinsic deformations such as shrinkage. This thesis treats the cracking of a concrete wall mainly subjected to shrinkage where both external and internal restraints are accounted for. Restraint forces introduce tensile stresses in a concrete wall. Since concrete is a material strongly characterised by its low tensile strength and, consequently, tendency to crack, tensile stresses from restraints could result in the formation of cracks. If these cracks are allowed to develop without control, the tightness, durability and performance of a concrete wall could decrease considerably. In order to control such restraint related cracking a certain minimum amount of reinforcement is required, for which Eurocode 2 provides an expression. However, this expression is of questionable applicability in restraint situations, since it has been derived inconsiderate of restraints. The derivation is based on a beam section subjected to combined moment and axial force assuming an uncracked section. A Matlab calculation program, inserting and accounting for cracks, was developed to model a restrained concrete wall subjected to shrinkage as a 1D-strip. The model was used in a parametric, study where the applicability of the Eurocode 2 expression and the respective influences of various parameters on the cracking situation were investigated. To further strengthen the investigation and to provide a connection with reality, cellar walls of two existing buildings were investigated. Crack widths and crack distribution in selected walls of the visited buildings were measured and documented. The thesis concludes that the Eurocode 2 equation is likely to overestimate the needed amount of minimum reinforcement and, due to the questionable applicability and results from the parametric study, that an expression accounting for restraints would be favourable as a replacement of the current expression." @default.
- W156743802 created "2016-06-24" @default.
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- W156743802 date "2015-01-01" @default.
- W156743802 modified "2023-09-28" @default.
- W156743802 title "Crack Control of Extended Concrete Walls" @default.
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