Modelling of tensile zone behaviour of reinforced concrete members

Donatas Salys

Doctoral dissertation

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Technological sciences, civil engineering (02T).

In spite of tension-stiffening has been investigated more than seven decades, there are no uniform and approved deformations and crack widths calculation techniques and material models in the world. Analysis can be performed using not only design codes, but and numerical methods. Numerical methods, with complicated mathematical tool, perfectly define building structures, having ideal behaviour models (e. g. steel). Unfortunately, using well-known reinforcement and concrete interaction models, the obtained errors not much vary from design code methods.

An experimental investigation of tension-stiffening and short-term deformations of three reinforced concrete beams tested by the author. These beams had the same nominal cross-section parameters and similar material characteristics, but different reinforcement ratio.

An innovative numerical procedure has been proposed for deriving free-of-shrinkage tension-stiffening relationships using moment-curvature relationships of reinforced concrete flexural members. Modelling of tension-stiffening attributed to tensile reinforcement. The inverse analysis is based on use of a moment-curvature relationship. Based on the geometrical parameters of the cross-section, the layer section model has to be composed. Total stresses in tensile reinforcement consist of actual stresses corresponding to the average strain of the steel and additional stresses due to tension-stiffening. However, it should be noted that the tension-stiffening after reaching the maximum was reducing at different rate depending on the reinforcement ratio. Thus, the tension-stiffening stresses were decreasing more rapidly in the members having higher reinforcing ratio. Such a modelling approach is very efficient algorithmic realization of the purposes for solving the inverse problem up a single nonlinear equation. This equation is dealt with the subject of one unknown (tension reinforcement strain modulus). In addition, the proposed method enables the high-performance concrete tension zone area.

Based on bond-slip relationship, which models the bond-action between concrete and reinforcement. Realistically modelling cracking and determining crack widths and deformations performed intending that discrete cracking modelling technique becomes a powerful tool for analysis of reinforced concrete members. The first part of the chapter was dedicated to the analysis of tensile members, whereas the second part was dealing with bending members.

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160×230 mm
120 p.
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