Abstract
This paper deals with an experimental investigation and numerical simulation of reinforced concrete columns. The behavior of normal and high strength columns is studied, with special attention paid to the confinement effects of transversal reinforcement in columns with a square cross section. The character of a failure, and the strengths, ductility and post-peak behavior of columns are observed in experiments and also in numerical solution. A three-dimensional computational model based on the microplane model for concrete was constructed and compared with experimental data. The results of the numerical model showed good agreement in many aspects, and proved the capabilities of the used material model.
Highlights
Nowadays, attention in civil engineering is focused on high performance structural materials
High strength concrete members usually suffer from lower ductility
Special attention must be paid to the post-peak behavior of such columns, because reduction of ductility can lead to a significant reduction of the overall load bearing capacity of the structure during abnormal loading, such as earthquake or a terrorist attack, for example
Summary
Attention in civil engineering is focused on high performance structural materials. The high performance of the material tends to substantial questions concerning the bearing capacity, and its ductility and post-peak behavior. The problem of concrete ductility is complicated by dependence on the amount of confinement, i.e. the amount of transversal reinforcement This concerns both high and normal strength concretes. Many authors have investigated the load bearing capacity of columns and the confinement effects of reinforcement These studies have been oriented mainly to strength investigations. Fam and Ritzakalla [9] investigated a series of small to large-scale circular columns cast into steel and composite tubes They showed the importance of lateral confinement, what can lead to more than a 100% strength increase. These works concern mainly strength issues and not the ductility
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