Zum Tragverhalten CFK‐umschnürter Stahlbetonstützen mit Kreisquerschnitt

Kaeseberg, Stefan; Holschemacher, Klaus; Curbach, Manfred

doi:10.1002/best.201800008

Cited by 3 publications

(3 citation statements)

References 18 publications

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“…B. [22–24], sowie vorhandenen Richtlinien und Normen [2–5, 7] wird meist auf das Modell von Lam und Teng [1, 25] bzw. das überarbeitete Modell von Teng et al [26] zurückgegriffen.…”

Section: Diskussionunclassified

Einfluss der Untergrundvorbehandlung auf das Tragverhalten CFK‐umschnürten Betons

Messerer

Kaeseberg

Weisbrich

et al. 2020

Beton und Stahlbetonbau

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Die Umschnürung mit CFK‐Werkstoffen ist eine effektive Maßnahme zur Steigerung der Tragfähigkeit und Duktilität von Stahlbetonstützen. Die Umschnürungsbewehrung bewirkt eine Behinderung der Querdehnung des Betons und versetzt diesen in einen dreidimensionalen Spannungszustand. Dadurch lassen sich höhere Betondruckfestigkeiten erzielen und das Spannungs‐Dehnungsverhalten beeinflussen. Trotz nationaler und internationaler Forschungsbemühungen ist der Einfluss bestimmter Parameter auf das Tragverhalten CFK‐umschnürten Betons noch nicht ausreichend geklärt. Der Beitrag befasst sich mit den Auswirkungen der Untergrundvorbehandlung auf das Tragverhalten von CFK‐Mantel und umschnürtem Beton. Zu diesem Zweck wurden CFK‐umschnürte Betonzylinder mit unterschiedlichen Verbundbedingungen und Maßnahmen zur Untergrundvorbehandlung untersucht. Darüber hinaus wurden die experimentellen Daten bestehender, empirischer Bemessungsmodelle hinsichtlich der Vorbehandlungsmaßnahmen der einzelnen Versuchsprogramme ausgewertet.

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“…B. [22–24], sowie vorhandenen Richtlinien und Normen [2–5, 7] wird meist auf das Modell von Lam und Teng [1, 25] bzw. das überarbeitete Modell von Teng et al [26] zurückgegriffen.…”

Section: Diskussionunclassified

Einfluss der Untergrundvorbehandlung auf das Tragverhalten CFK‐umschnürten Betons

Messerer

Kaeseberg

Weisbrich

et al. 2020

Beton und Stahlbetonbau

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“…At this time, an extensive research program regarding CFRP confined short concrete columns has been launched at Leipzig University of Applied Sciences. The entire experimental program, further cited and used data from the literature, and particular results are described in References [37,38,39]. Concerning the discrepancies and differences discussed in the previous sections, the program revealed some remarkable findings regarding the crucial rupture strain ε ju , the entailed partial safety factor γ j , the prediction of k 1 , and the calculation of f cc and ε cc for confined plain and reinforced concrete columns.…”

Section: Experimental Findingsmentioning

confidence: 99%

Assessment of Standards and Codes Dedicated to CFRP Confinement of RC Columns

Kaeseberg¹,

Messerer²,

Holschemacher³

2019

Materials

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Reinforced concrete (RC) columns are often placed under confinement to increase their strength and ductility. Carbon fiber reinforced polymer (CFRP) materials have recently been recognized as favorable confinement systems. At present, a number of national standards and codes dedicated to the design of concrete components strengthened with CFRP in general and CFRP confinement in particular are available. These sets of rules provide design equations for confined reinforced concrete columns with circular and rectangular cross sections. Most of the standards and codes exhibit significant differences, including the used predictive models, limitations, observed effects and covered loading conditions. In this paper, five international standards and design guidelines are introduced and discussed. The purpose is to present a constructive and critical assessment of the state-of-the-art design methodologies available for CFRP confined RC columns and to discuss effects not previously considered properly. Therefore, some recent research efforts and findings from the Leipzig University of Applied Sciences are also introduced. The obtained data is used for a comparative study of the guideline predictive equations. Furthermore, it is shown that some new findings concerning the rupture strength and the maximum strength plus accompanying axial strain of a CFRP confined column are suitable to improve the current guidelines.

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“…The general introduction is followed by a more detailed presentation of one of the four actuation concepts, which can also increase the compressive strength of its central concrete column through actuation, by externally compressing the concrete column in the lateral direction. This effect can also be exploited in passive composite concrete columns [24][25][26][27][28] to strengthen the concrete column through external compression. Other commercial products are designed for subsequent strengthening of columns to extend the use phase of the respective building.…”

Section: Introduction 1adaptive Engineering Structuresmentioning

confidence: 99%

An Actuator Concept for Adaptive Concrete Columns

et al. 2021

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The building industry accounts for half of the global resource consumption and roughly one third of global CO2 emissions. Global population growth and increasing resource scarcities require engineers and architects to build for more people with less material and emissions. One promising solution are adaptive load-bearing structures. Here, the load-bearing structure is equipped with actuators, sensors, and a control unit which allows the structure to adapt to different load cases, resulting in substantial material savings. While the first prototypes use industry standard actuators to manipulate deformations and stress states, it is essential to develop actuator concepts which fit the specific requirements of civil engineering structures. This paper introduces new concepts for linear actuators, developed within the Collaborative Research Centre (SFB) 1244 Adaptive Skins and Structures for the Built Environment of Tomorrow, which can be used as adaptive concrete columns. The concept of an actuator which actuates a concrete column by external compression through hydraulic pressure is discussed in further detail. This concept allows for controlled axial extension while also increasing the compressive strength of the concrete column.

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Zum Tragverhalten CFK‐umschnürter Stahlbetonstützen mit Kreisquerschnitt

Cited by 3 publications

References 18 publications

Einfluss der Untergrundvorbehandlung auf das Tragverhalten CFK‐umschnürten Betons

Einfluss der Untergrundvorbehandlung auf das Tragverhalten CFK‐umschnürten Betons

Assessment of Standards and Codes Dedicated to CFRP Confinement of RC Columns

An Actuator Concept for Adaptive Concrete Columns

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