Badania wpływu wzmocnienia taśmami z polimeru i włókien węglowych na trwałość zmęczeniową zginanych belek żelbetowych / Wit Derkowski // Zeszyty Naukowe. Budownictwo / Politechnika Łódzka. ... więcej

Badania wpływu wzmocnienia taśmami z polimeru i włókien węglowych na trwałość zmęczeniową zginanych belek żelbetowych / Wit Derkowski // Zeszyty Naukowe. Budownictwo / Politechnika Łódzka. – 2006, Z. 55, s. 9-16 : fot., rys., tab. – Bibliogr. 1 poz., Summ. – Tyt. zeszytu: Referaty z [II] Konferencji Naukowo-Technicznej Materiały Kompozytowe w Budownictwie Mostowym, [Łódź, 11-12 maj 2006]. – Seria gł.: Zeszyty Naukowe / Politechnika Łódzka ; 993. – ISSN 0076-0323

The paper focuses on the fatigue tests carried out on the two series of reinforced concrete beams with different steel ratio. Tested elements were 3,5 m long and had rectangular cross-section 25 x 40 cm. ... więcej

The paper focuses on the fatigue tests carried out on the two series of reinforced concrete beams with different steel ratio. Tested elements were 3,5 m long and had rectangular cross-section 25 x 40 cm. For each group of the bearns, the value of fatigue load was matched to get similar stresses in the tension bars. Analysis of the results of the experi- mental investigations shows the following main conclusions: -strengthening of reinforced concrete beams by gluing non-stressed CFRP strips, increases their fatigue life; -an increase in fatigue life of the normal cross-section of the strengthened reinforced concrete beam results from the increase of the durability of the reinforcing bars; -the beam strengthening ratio depends on the area of used external CFRP strips and localization of those strips according to individual rebars; -additional anchorages of the strips (by wrapping ends of the beams with carbon fiber sheets) cause the increase of fatigue strength and durability.