Bond of cement grouted reinforcing bars under constant radial pressure

Moosavi, M.; Jafari, Arian; Khosravi, Arash

doi:10.1016/j.cemconcomp.2003.12.002

Cited by 98 publications

(35 citation statements)

References 3 publications

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“…The first type is comparatively simple in installation, versatile, effective in reinforcement, and also economical. This type is widely used in underground excavation projects for stability [19][20][21], and, owing to this reason, empirical systems also focus on fully grouted rock bolts. The CMC bolts are strong and stiff bolts compared to the last two types, which are flexible and absorb large ground deformation.…”

Section: Factors Affecting the Performance Of Fully Grouted Rock Boltsmentioning

confidence: 99%

Classification of Factors Affecting the Performance of Fully Grouted Rock Bolts with Empirical Classification Systems

et al. 2019

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Empirical classification systems do not provide details of the factors that affect the performance of fully grouted rock bolts, as they are based on average values. Fully grouted rock-bolt patterns during tunnel-support design are a part of the composite support, and they are functions of rock-mass quality and tunnel span. Various fully grouted rock bolts are used in situ in different environments, along with other tunnel-support materials in static and dynamic environments during tunnel construction. The rock-bolt performances are evaluated through pull-out tests that follow ASTM standards. Several field pull-out tests were conducted on cement and resin grouted rock bolts. Under groundwater flow conditions, inflated steel tube rock bolts were tested and the results were compared with fully grouted rock bolts. Based on field experiments and previous studies, the factors that affect rock bolt performances are divided into five groups with respective sub-factors. Natural parameters cannot be controlled to ensure safety, economy, and stability in tunnels. The controllable factors, too, can be varied only within a practical range. In conclusion, the factors investigated here should be considered with the empirical support pattern of rock-mass classification systems for safe and economical design.

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Section: Factors Affecting the Performance Of Fully Grouted Rock Boltsmentioning

confidence: 99%

Classification of Factors Affecting the Performance of Fully Grouted Rock Bolts with Empirical Classification Systems

et al. 2019

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“…The frictional resistance of the bar-concrete interface against slip is enhanced with the presence of radial pressure on the lateral bar surface [3]. Confinement provided to the anchorage bond zone is an important factor that improves the bond resistance [4,5,6]. Confinement can be achieved by applying normal pressure in a direction perpendicular to the applied axial stress in the reinforcing bars [7,8].…”

Section: Figure 1 Grouted Sleeve Connectormentioning

confidence: 99%

Bond behavior of the reinforcement bar in GFRP connector

2014

JCE

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Bond behavior of the reinforcement bar in glass fiber-reinforced polymer connectorThis paper presents the bond stress -slip behavior of a newly developed grouted splice connection fabricated by glass fiber-reinforced polymer (GFRP). A total of twenty seven specimens were tested under increasing axial tension load. Results from the test specimens were adapted to model a bond stress -slip law to be compared with the requirements provided by design codes and provisions. The results show that by reducing mid-length diameter, higher bond strength and load capacity are generated in the tapered splice sleeves. Prionljivost armaturne šipke u spoju od polimera armiranog vlaknima U ovom se radu prikazuje ispitivanje prianjajna i proklizavanja armaturne šipke u novorazvijenoj injektiranoj spojnici sa staklenim vlaknima (eng. glass fiberreinforced polymer -GFRP). Ukupno dvadeset sedam uzoraka ispitano je postupnim povećavanjem osnog vlačnog opterećenja. Rezultati dobiveni ispitivanjem uzoraka usvojeni su za modeliranje ovisnosti naprezanje prianjanja -proklizavanje, što je uspoređeno sa zahtjevima iz normi i odredbi. Rezultati pokazuju da se u konusnim spojnicama razvija veća čvrstoća prianjanja i otpornost na opterećenje usporedo sa smanjenjem promjera u srednjem dijelu. Verbundverhalten von Bewehrungsstahl in Verbindungen aus glassfaserverstärktem PolymerIn dieser Arbeit wird das Haft-und Rutschverhalten einer neu entwickelten mit glassfaserverstärktem Polymer (GFRP) verarbeiten Spleißverbindung dargestellt. Insgesamt sind siebenundzwanzig Proben unter steigenden axialen Zugkräften untersucht worden. Der Einfluss wichtiger Parameter, wie z.B. des inneren Durchmessers der GFRP Verbindung und der Anzahl verwendeter Lagen aus GFRP, ist überprüft worden. Die Versuchsresultate sind angewandt worden, um ein Haftungs-und Rutschverhaltensgesetz aufzustellen und das gegebene Model mit den Anforderungen bestehender Regelwerke und Bestimmungen zu vergleichen.

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“…Dans le but de mieux maîtriser le processus de transfert de charge entre le soutènement et le terrain, le comportement des interfaces barre-scellement et scellement-terrain doit être bien compris. Dans cette recherche, on s'intéresse à l'interface barre-scellement parce que l'expérience montre qu'elle est souvent moins résistante que l'interface scellement-terrain, en particulier dans le domaine des milieux rocheux (Hyett et al, 1995 ;Kaiser et al, 1992 ;Moosavi et al, 2005 ;Pakalnis et al, 1994 ;Reichert et al, 1992 ;Stillborg, 1986).…”

Section: Introductionunclassified

Boulonnage à ancrage réparti : étude de l’interface barre-scellement sous sollicitations axiales

et al. 2016

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Résumé -Dans cet article, nous étudions l'interface barre-scellement du boulonnage/câblage à ancrage réparti. L'application d'un effort de traction sur la barre permet d'examiner le phénomène de décohésion de l'interface. Des études expérimentales et théoriques ont été menées, en conditions statiques. Les études théoriques sont utiles pour convertir les variables observables dans les matériaux environnants (barre, scellement, terrain) en variables d'interface, non accessibles directement. Les études expérimentales, effectuées en laboratoire et in situ, permettent de déterminer les facteurs les plus influents sur la réponse de l'interface. La combinaison de ces deux études constitue une méthode d'accès à la réponse de l'interface barre-scellement. Un exemple d'application de la nouvelle méthode est détaillé pour une configuration en laboratoire. L'analyse de plusieurs interfaces suggère que la réponse tangentielle n'est pas seulement due au frottement et que la réponse radiale dépend fortement du profil de la barre.Mots clés : Boulonnage à ancrage réparti / interface barre-scellement / approche analytique / essai d'arrachement / formulation semi-empirique / modèle d'interface Abstract -Fully grouted bolts: assessment of the bolt-grout interface response under axial loads. In this paper, we investigate the bolt-grout interface of fully grouted bolts. To study the interface debonding process, an axial tensile load is applied on the bar. Experimental and theoretical investigations have been conducted, in static conditions. The theoretical studies allow converting the variables measured in the surrounding materials (bolt, grout, ground) in interface variables, which cannot be measured directly. The experimental studies have been carried out at laboratory and field scales. They are useful to determine the most influencing parameters on the interface response. The combination of the theoretical developments with the experimental results leads to a method to access the bolt-grout interface response. An application example of the new method is detailed for a laboratory set-up. The analysis of several interfaces suggests that the tangential response is not only due to friction and that the normal response is highly dependent on the bolt profile.

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Bond of cement grouted reinforcing bars under constant radial pressure

Cited by 98 publications

References 3 publications

Classification of Factors Affecting the Performance of Fully Grouted Rock Bolts with Empirical Classification Systems

Classification of Factors Affecting the Performance of Fully Grouted Rock Bolts with Empirical Classification Systems

Bond behavior of the reinforcement bar in GFRP connector

Boulonnage à ancrage réparti : étude de l’interface barre-scellement sous sollicitations axiales

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