Prestressing concrete members with fibre‐reinforced polymer reinforcement: State of research

Zdanowicz, Katarzyna; Kotynia, Renata; Marx, Steffen

doi:10.1002/suco.201800347

Cited by 33 publications

(47 citation statements)

References 58 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…When FRP cables are used either for prestressing structural elements or supporting bridge decks, their anchorages need to be properly designed to reduce the cable stress state. Different types of anchorage systems have been proposed in technical and scientific literature so far, and a state of the art review is reported in different works [10][11][12][13][14][15]. These systems include bonded and mechanical devices.…”

Section: Introductionmentioning

confidence: 99%

FRP Cables to Prestress RC Beams: State of the Art vs. a Split Wedge Anchorage System

2021

View full text Add to dashboard Cite

Versatility and high performance in terms of specific stiffness and strength, as well as non-corrosive sensitivity, make FRP (Fiber-Reinforced Polymer) cables a viable alternative to steel ones in the development of prestressing systems. On the other hand, the orthotropic and brittle nature of FRPs could trigger a premature failure of the cable in the anchorage system, for which several solutions have been proposed so far in civil structural applications. In this context, after a preliminary state of the art, the work introduces a split wedge anchorage for FRP (ϕ = 12 mm) cables proposing two different solutions for steel wedges having the external surface: either (1) a constant (3 degrees) slope or (2) a double slope obtained by shaping it with an angle of 3.0 degrees before and then of 3.1 degrees along the most tapered part. The goal was to exploit the nominal cable capacity (257 kN), avoiding stress peaks that cause its premature failure. The proposed solutions have been experimentally tested and, as far as the double angle solution is concerned, the failure loads were equal to 222 and 257 kN, denoting that the proposed solution can reach the cable capacity. Clearly, further investigations are needed to check the variability of the results and eventually improve the system.

show abstract

Section: Introductionmentioning

confidence: 99%

FRP Cables to Prestress RC Beams: State of the Art vs. a Split Wedge Anchorage System

2021

View full text Add to dashboard Cite

show abstract

“…Um Schäden infolge von Querpressungen zu vermeiden, ist die Zugkraft möglichst gleichmäßig in die Verankerung einzuleiten. Mit Verankerungen bei Stäben und Litzen aus kohlenstofffaserverstärktem Kunststoff (CFK) wurden bereits gute Ergebnisse erzielt [1, 2]. Für Textilbewehrung sind die aufgeführten Verankerungen jedoch nicht praktikabel [3, 4] und andere Vorspannungssysteme befinden sich noch in der Entwicklungsphase [5].…”

Section: Einführung Und Motivationunclassified

Biege‐ und Verbundverhalten von chemisch vorgespannten textilbewehrten Betonelementen

Zdanowicz

Schmidt

Hansén

et al. 2020

Beton und Stahlbetonbau

Self Cite

View full text Add to dashboard Cite

Die chemische Vorspannung ist ein alternatives Verfahren zur Spannungseinleitung in Beton, das ohne mechanische Spannvorrichtungen auskommt. In diesem Beitrag werden die Ergebnisse von experimentellen Untersuchungen zum Trag-und Verformungsverhalten von dünnen textilbewehrten Quellbetonelementen vorgestellt. Hierzu wurden Verformungsmessungen zum freien und behinderten Quellen an Probekörpern unterschiedlicher Quellbetonmischungen sowie experimentelle Untersuchungen zum Biege-und Verbundverhalten von dünnen, mit Carbontextilgittern bewehrten Probekörpern durchgeführt. Die Versuchsergebnisse bestätigen, dass die Verwendung von Quellzusatzmitteln das Verhalten des Textilbetons beeinflusst. Die Beanspruchung bei Erstrissbildung sowie die Durchbiegung bei Erstrissbildung können mit zunehmendem Anteil von Quellzusatzmitteln erhöht werden. Zudem erreichen die Probekörper aus Quellbeton höhere maximale Verbundspannungen als entsprechende Probekörper ohne Quellzusatzmittel.

show abstract

“…Hoyer effect, referred to as “wedge action,” was investigated in 1939 . It is active exclusively in transfer zone in pretensioned concrete members . When a prestressing strand is pretensioned, the tensile force causes a reduction of the strand diameter by Poisson's ratio as the strand is elongated.…”

Section: Three Bond Mechanismsmentioning

confidence: 99%

Pretensioned pullout test of 18 mm (0.7 in.) diameter strand with different embedment lengths

Xin

Gui

John

2019

Structural Concrete

View full text Add to dashboard Cite

In this paper, a pretensioned pullout test method was proposed to better understand the bond mechanism and evaluate the bond behavior of pretensioned concrete members. A total of 15 pullout specimens with a centered 18‐mm (0.7 in.) diameter strand were tested. The specimens were divided into three sets according to their strand embedment lengths. For each set, there are two non‐pretensioned specimens and three pretensioned specimens with different initial prestress levels. In this way, the effects of the strand embedment length and the pretension level on the bond behavior were studied, in terms of the development of strand slip subject to the pullout force, initial P–S slope, the distribution of concrete surface strain, the ultimate failure mode and the pullout energy. The experimental results verified that the strand transfer length was dependent of prestress level. The transfer length may be predicted based on the different level of effective pretension force or stress in pretensioned specimens with different strand embedment lengths at detensioning. In essence, the disparities of the bond behaviors in the tests were caused by the contributions of different bond mechanisms. In return, the former, especially the characteristics of the development of strand slip and pullout energy, may be used for the quantificational evaluation of the bond mechanisms. Hoyer effect is verified as the dominant bond mechanism within transfer length.

show abstract

Prestressing concrete members with fibre‐reinforced polymer reinforcement: State of research

Cited by 33 publications

References 58 publications

FRP Cables to Prestress RC Beams: State of the Art vs. a Split Wedge Anchorage System

FRP Cables to Prestress RC Beams: State of the Art vs. a Split Wedge Anchorage System

Biege‐ und Verbundverhalten von chemisch vorgespannten textilbewehrten Betonelementen

Pretensioned pullout test of 18 mm (0.7 in.) diameter strand with different embedment lengths

Contact Info

Product

Resources

About