Using mineral based composites for shear strengthening concrete members

2011 ◽  
pp. 623-630
Author(s):  
T Blanksvärd ◽  
B Täljsten
Keyword(s):  
Shear Strengthening ◽  
Concrete Members

Experimentelle Untersuchungen und Vorstellung eines Bemessungsansatzes zur Durchstanzverstärkung von Betonbauteilen mit Betonschrauben/Experimental investigations and presentation of a design approach for punching shear strengthening of concrete members with concrete screws

Bauingenieur ◽  
2020 ◽  
Vol 95 (01) ◽  
pp. 26-36 ◽  
Author(s):  
Rupert Walkner ◽  
Matthias Spiegl ◽  
Jürgen Feix
Keyword(s):  
Punching Shear ◽  
Design Approach ◽  
Experimental Investigations ◽  
Shear Strengthening ◽  
Concrete Members ◽  
Experimentelle Untersuchungen

Zusammenfassung Werden bei bestehenden Tragwerken Sicherheitsdefizite entdeckt, ist es häufig wirtschaftlicher und ökonomischer das Tragwerk zu verstärken, als es neu zu errichten. Seit einigen Jahren wird an der Universität Innsbruck die Wirkungsweise von Betonschrauben bei ihrem Einsatz als Durchstanzverstärkung untersucht. Dazu wurden bislang vier Versuchsserien durchgeführt. Die Ergebnisse der jüngsten Serie, welche den Einfluss des Biegebewehrungsgrades auf den Durchstanzwiderstand zeigt, werden in diesem Aufsatz vorgestellt. Für die Dimensionierung des Verstärkungssystems wurde ein praxistauglicher, an die Regelungen des EC 2 angelehnter, Bemessungsansatz abgeleitet. Mit diesem Ansatz lassen sich die Versagenslasten der bisher durchgeführten Versuche bei geringer Streuung ausreichend sicher prognostizieren.

SHEAR REPAIRED RC BEAM BY FRP BONDING WITH EXTERNAL POST-TENSIONING

2014 ◽  
Vol 1 (1) ◽  
Author(s):  
Rumana Choudhury ◽  
T.G. Suntharavaivel ◽  
Nirmal Mandal
Keyword(s):  
Reinforced Concrete ◽  
Shear Capacity ◽  
Rc Beams ◽  
Structural Members ◽  
Shear Cracks ◽  
Shear Strengthening ◽  
Flexural Strengthening ◽  
Concrete Members ◽  
Post Tensioning ◽  
Strengthening Technique

Various factors, including increase in traffic volume and weight, structural aging, and environmental impact, cause damage in structural members. This raises the importance of the maintenance, rehabilitation, and strengthening of reinforced concrete members. External post-tensioning is one of the widely-used strengthening techniques in many countries due to its advantages over other strengthening methods. Although flexural strengthening of existing structural members is a well-established method, shear strengthening of structural members, especially with existing shear cracks, has attained very little attention from researchers. Similarly, external fiber-reinforced polymer (FRP) bonding for shear strengthening of structural members, especially with existing shear cracks, is a relatively new area of research. This paper presents the results of an experimental study on the shear strengthening of reinforced concrete (RC) beams with existing shear cracks by external post-tensioning and external FRP bonding. The test result showed that the combined strengthening technique of external post-tensioning and external FRP bonding can effectively increase the shear capacity of RC beams with existing shear cracks.

Analysis of the Effect of Elevated Temperature on Reliability of Shear Strengthened Concrete Beams

2016 ◽  
Vol 691 ◽  
pp. 160-171
Author(s):  
Peter Sabol ◽  
Sergej Priganc
Keyword(s):  
Elevated Temperature ◽  
Ambient Temperature ◽  
Elevated Temperatures ◽  
Concrete Beams ◽  
Reinforced Concrete Beams ◽  
Polymer Materials ◽  
Shear Strengthening ◽  
Near Surface ◽  
Concrete Members ◽  
Original Strength

This article presents the results of experimental research focused on the shear strengthening of reinforced concrete beams with one of the latest and most promising method: NSM - Near surface mounted reinforcement. In recent years, research in this area focuses on combination of epoxy and FRP (fiber reinforced polymer) materials suitable for strengthening concrete elements. A traditional material: stainless steel was also used in this study but in non-traditional T-cross section in terms of strengthening of concrete members. Structural epoxy adhesives offer excellent properties but are very sensitive to elevated temperatures. Effect of increasing temperature gradually degrade their properties and subsequently decreased bond strength, whereas during cooling may acquire significant parts of the original strength. The influences of these factors were investigated in shear resistance of NSM strengthened concrete beams under four point bending at ambient temperature, at elevated temperature and after cooling to ambient temperature.

scholarly journals Shear strengthening of concrete members with unbonded transverse reinforcement

2019 ◽  
Vol 180 ◽  
pp. 40-49 ◽  
Author(s):  
Mathieu Fiset ◽  
Josée Bastien ◽  
Denis Mitchell
Keyword(s):  
Transverse Reinforcement ◽  
Shear Strengthening ◽  
Concrete Members
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