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Concrete is a material that has advantages and disadvantages. High strength in pressure, as well as increased mechanical resistance are its advantages, on the other side, it has a lower tensile strength as its disadvantage. This is related with creating cracks, when concrete in a tensile zone occurs plasticisation of reinforcement (provided that members are reinforced) which is in consequence of depletion carrying capacity associated with creating plastic hinge and exceed his rotation capacity. Following, the cross-section has a lower carrying capacity. Strengthening of jacketing by fibre-concrete has provided with reducing width of cracks an increasing of carrying capacity cross-section at minimal increasing of the columns slenderness.

Numerical analysis of strengthening concrete columns by high performance fibre concrete