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Prestressing concrete structures with CFRP composite tendons

Ryngier K., Zdanowicz Ł.

Engineering Transactions

2015

Vol. 63, iss. 4

407--419

This paper presents a study on prestressing concrete structures with Carbon Fibre Reinforced Polymer (CFRP) tendons. It is an alternative to conventional steel prestressing materials, which distinguishes itself by complete resistance to corrosion, good tensile and fatigue strength and better performance in time under loading. Mechanical properties and examples of prestressing structures with composite tendons are briefly described. The article is focused mainly on describing procedures given by available codes and guidelines. Finally, calculations for an example of a concrete beam prestressed with CFRP tendons are conducted and the results and differences between both codes are presented and summarized.

Strengthening of bent reinforced concrete beams with FRP composites - comparison of ULS design guidelines

Ryngier K., Derkowski W.

Czasopismo Techniczne. Budownictwo

2013

R. 110, z. 2-B

111--124

The paper raises an issue of designing flexural strengthening of reinforced concrete beams with FRP composite materials. Three different design approaches are presented. The conducted analysis consists of the determination of the load-bearing capacity of a beam, the assumption of loading and the evaluation of a capacity increase after strengthening the beam with a CFRP strip. Results are compared and justified and some conclusions are drawn. Furthermore, an author’s computer software for simple verification of ultimate limit state is briefly presented.

Artykuł porusza kwestię projektowania wzmocnień belek żelbetowych na zginanie przy pomocy materiałów kompozytowych FRP. Opisano procedury projektowania i porównano wyniki obliczeń przykładowej belki według trzech różnych norm, ponadto przedstawiono autorski program komputerowy pozwalający na obliczenie wzmocnienia belki o przekroju prostokątnym taśmami CFRP.