Behavior of Chemically Bonded Anchors

Cook, Ronald A.

doi:10.1061/(asce)0733-9445(1993)119:9(2744)

Cited by 114 publications

(98 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…8) y 5/8" (15,9mm) (Fig. 9), para observar el comportamiento durante el ensayo de tracción de los sistemas de anclajes [27]. Para cada grupo de resistencia de concreto f´c 1 y f´c 2 , se identifica cada una de las probetas para correlacionarlas entre ellas.…”

Section: Evaluación De La Resistencia Efectivaunclassified

Anclajes posinstalados en concretos de alta resistencia

Arias

Moreno

2017

Cien.Ing.Neogranadina

View full text Add to dashboard Cite

Hoy en día, las grandes construcciones de Colombia y el mundo, y en especial las de infraestructura vial, han fomentado el uso de concretos de alta resistencia; también ha crecido de forma simultánea el uso de los anclajes posinstalados en todas las estructuras de concreto. Por lo anterior, se desarrolló en esta investigación un procedimiento experimental para evaluar sistemas de anclaje posinstalados, basado en ensayos a tracción con probetas de concreto de alta resistencia. La evaluación considera el análisis de los resultados de los ensayos a tracción de probetas con un sistema de anclaje para tres longitudes (6, 9 y 12 veces el diámetro de la varilla) con dos diámetros de varilla (3/8” y 5/8”) en dos calidades de concreto de alta resistencia (5000Psi y 6000Psi), para determinar la longitud y carga efectiva del sistema. El análisis que se realiza al ensayo experimental es correlacionar el resultado de la carga máxima de fluencia del acero de refuerzo utilizado (fy=4200Psi) con las variables del sistema de anclaje posinstalado. Con esto se obtuvo como resultados el porcentaje de resistencia del sistema en función de la longitud de anclaje, la longitud efectiva que garantiza la fluencia del acero y las correlaciones entre el porcentaje de resistencia efectiva alcanzada para cada longitud de anclaje con el uso de concreto de alta resistencia. Con los anteriores parámetros se analizó el aporte de los concretos de alta resistencia a la eficiencia de los sistemas de anclajes posinstalados.

show abstract

Section: Evaluación De La Resistencia Efectivaunclassified

Anclajes posinstalados en concretos de alta resistencia

Arias

Moreno

2017

Cien.Ing.Neogranadina

View full text Add to dashboard Cite

show abstract

“…Ac(x) = Cross-sectional area of concrete As = Cross-sectional area of rebar Ch = Circumference of hole size used δ = Deformation measured at a separation in the field E = Young's modulus εavg = Average elastic strain along the loaded length Ec(x) = Young's modulus of concrete ec(x) = Contraction of concrete efs = Elongation of free length of steel (rebar) es ( Figure 1.1 Cross-section of the prairie evaporite and surrounding formations (Fuzesy, 1982) ..... 2 Figure 1.2 Clay seams allow shear deformation to occur readily (Hills, 2005 Figure 1.4 Suspension and pinning functions of internal rock support (Lovlin, 2006) Stillborg (1984) and (b) Dube (1995) .... 24 Figure 2.7 Example showing loading behaviour both before and beyond the elastic limit (Cook, 1993) Figure 1.1 shows the massive evaporite deposit that reaches thicknesses of 150 metres (500 feet) at some points. It is the result of an inland sea that stretched from Peace River Alberta to the Red River area in Manitoba.…”

Section: Notationmentioning

confidence: 99%

“…This section highlights research completed in structural engineering relevant to this research project. Cook (1993) studied the failure mechanisms of post-installed rebar anchored with chemical bonding agents (i.e. resin).…”

Section: Structural Engineering Literature For Post-installed Rebar Smentioning

confidence: 99%

Failure mechanism of resin anchored rebar in potash

Neely¹,

Milne²,

Feldman³

et al. 2016

CIMJ

View full text Add to dashboard Cite

The use of reinforcing bar (rebar) anchored with resin is a common method of rock support in both hard and soft rock mining. The average bond strength, or the load that the support can sustain for a linear length of bond to the rock, is typically determined through a series of pull tests. The average value of bond strength varies widely, since it is dependent on in-situ rock properties and environment. It is an important value because it allows mine engineers to select the appropriate length and pattern spacing of installation for the support. When a stiff support, like resin-anchored rebar, is placed in a weak, soft material, such as potash, the average bond strength tends to be lower in magnitude than for a typical hard rock installation.This research was primarily aimed at determining the failure mechanism, in soft rock applications, by which the support loses adhesion and begins to fail by sliding. Results of field pull testing determined that the resin-rock bond strength was the limiting factor controlling when adhesion loss occurred. This study investigated how the bond strength may vary given a number of variables typically found in a potash mine environment. Results reported from testing did not indicate variation in the bond strength of resin anchored rebar, significant for mining applications, given changes in resin cure time, vicinity to active mining areas, or the rock type to which the resin was adjacent.Using the results of laboratory and field testing, an equation was developed to estimate load on insitu resin anchored rebar given deformation measurements taken from the field. This equation will help determine safe limits for fracture separations opening in the backs of potash drifts. POTASH MINING DEFINITIONSPotash -for the purposes of this thesis refers to a rock made up of Halite (NaCl), various clays (insolubles), and at least 18-28% Sylvite (KCl).Salt -for the purposes of this thesis refers to a rock made up almost entirely of Halite (NaCl) with trace amounts of clays (insolubles) and a low (1-4%) content of Sylvite (KCl) Rebar -Reinforcing Bar, refers to a type of ground support in form of a black (uncoated) rebar with a forged bolt head and a slashed (angled) toe tip.Mechanical Bolt -refers to a straight steel bar, with a forged bolt head, that is anchored using only a mechanical wedge at the toe end of the bolt.Dywidag Bar -a type of threaded rebar ground support specifically made by Dywidag SystemsInternational, a manufacturer of many types of ground support and mine supplies.Potash Opening -refers to a room/tunnel underground at a potash mine, most are 10 metres wide by 3 metres high and can be up to several kilometres in length.Back -the ceiling of an opening underground.Clay Seam -a thin deposit of clays (insolubles) that has been compacted into a hardened mudstone. There are several of these seams that separate layers of halite and potash.Beams of Potash/Halite -used to describe the layers of halite or potash formed between clay seams. Often referred to as beams because of th...

show abstract

“…Comparing with the mechanical anchor, adhesive anchors have greater capacity and better viability because of sufficient embedment depth and uniform distribution of bond stress [2]. Considerable efforts are firstly made in order to evaluate the mechanical behavior of post-installed anchors in concrete at room temperature [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Mechanical behavior of post-installed anchorage between steel and concrete under high temperature

Chi¹,

Xie²,

Guan³

2018

Proceedings of the 2017 3rd International Forum on Energy, Environment Science and Materials (IFEESM 2017)

View full text Add to dashboard Cite

Abstract. As a reliable technology for connecting a new steel element to the existing concrete structures, the post-installed anchorage is widely used in the field of structural retrofit and strengthening. In order to analyze the mechanical behavior of post-installed anchorage between steel and concrete under high temperature, the numerical simulation is carried out by ABAQUS software in this paper. Several 3D joint models of I-shaped steel beam connecting to concrete base are established with consideration of two parameters, the thickness of fire protection and embedment depth of bonded-in reinforcements. The natural fire curve and the inorganic adhesive are adopted. The results have been discussed and analyzed in the context of temperature field, load-displacement relationship at loading point and longitudinal displacement of bonded-in reinforcements. The results showed that the maximum temperature of bonded-in reinforcements could be controlled below 250°C if the thickness of fire protection is added up to 40mm. A calculation method is proposed by model data to predict the maximum temperature of bonded-in reinforcements. Both larger embedment depth and thicker fire protection can improve the residual bearing capacity of the joint after exposed to fire. The employment of inorganic adhesive has been verified to be an effective method to improve the bond performance between bonded-in reinforcements and concrete under high temperature.

show abstract

Behavior of Chemically Bonded Anchors

Cited by 114 publications

References 0 publications

Anclajes posinstalados en concretos de alta resistencia

Anclajes posinstalados en concretos de alta resistencia

Failure mechanism of resin anchored rebar in potash

Mechanical behavior of post-installed anchorage between steel and concrete under high temperature

Contact Info

Product

Resources

About