Split Set friction stabilizers: an experimental study of strength distribution and the effect of corrosion

1998 ◽  
Vol 35 (4) ◽  
pp. 678-683 ◽  
Author(s):  
Brian Stimpson
Keyword(s):  
Load Capacity ◽  
Field Tests ◽  
Strength Distribution ◽  
Rock Reinforcement ◽  
Physical Mechanisms ◽  
Rock Types ◽  
Pull Out ◽  
Strength Capacity ◽  
High Humidity Environment ◽  
Pull Out Strength

The pull-out strength of the widely used Split Set stabilizer for rock support, as measured in full-scale field tests in various rock types, has been shown to increase with time after installation. Several physical mechanisms for this increase have been postulated. In a series of laboratory tests in which one of these mechanisms, namely corrosion, was isolated so that its effect could be studied, anchorage capacity as measured by a special push test was found to increase up to 192% after Split Set samples installed in concrete were allowed to corrode for 90 days in a high-humidity environment. It is concluded that one major contributor to the significant increase of pull-out strength with time of Split Sets is corrosion. However, although substantial improvements in strength from this mechanism may be counted on over the short term, it is anticipated that over longer periods of time the strength capacity will decline as the amount of corrosion increases. The study also examined the distribution of strength along the length of the Split Set.Key words: rock reinforcement, friction stabilizers, load capacity, corrosion.

scholarly journals An Analytical Study on the Pull-Out Strength of Anchor Bolts Embedded in Concrete Members by SPH Method

2021 ◽  
Vol 11 (18) ◽  
pp. 8526
Author(s):  
Chi Lu ◽  
Yoshimi Sonoda
Keyword(s):  
Load Capacity ◽  
Seismic Retrofitting ◽  
Embedment Depth ◽  
Structural Members ◽  
Sph Method ◽  
Anchor Bolt ◽  
Failure Patterns ◽  
Pull Out ◽  
Anchor Bolts ◽  
Pull Out Strength

As an important method for connecting structural members, anchor bolts have been installed in many situations. Therefore, accurate evaluation of the pull-out strength of anchor bolts has always been an important issue, considering the complicated actual installation conditions and the problem of aging deterioration of the structural members. In general, the patterns of pull-out failure of anchor bolts can be classified into three types: adhesion failure, cone failure, and bolt break. However, it sometimes shows a mixed fracture pattern, and it is not always easy to predict the accurate pull-out strength. In this study, we attempted to evaluate the pull-out strength of anchor bolts under various installation conditions using SPH, which can analyze the crack growth process in the concrete. In particular, the anchor bolt-concrete interface model was introduced to SPH analysis in order to consider the bond failure, and it was confirmed that various failure patterns and the load capacity could be predicted by proposed SPH method. After that, the influence of several parameters, such as bond stress limit, anchor bolt diameter, and the anchor bolt embedment depth on the failure patterns and the load capacity, were investigated by numerical calculation. Furthermore, several useful suggestions on the pull-out strength of anchor bolts under improper installation conditions, such as the ends of members for the purpose of seismic retrofitting, are presented.

scholarly journals Effect Steel Fibre Content on the Load-Carrying Capacity of Fibre-Reinforced Concrete Expansion Anchor

Materials ◽  
2021 ◽  
Vol 14 (24) ◽  
pp. 7757
Author(s):  
Daniel Dudek ◽  
Marta Kadela ◽  
Marcin Małek
Keyword(s):  
Reinforced Concrete ◽  
Load Capacity ◽  
Tensile Load ◽  
Fibre Content ◽  
Fibre Reinforced Concrete ◽  
Cracked Concrete ◽  
Pull Out ◽  
Load Carrying ◽  
The Difference ◽  
Pull Out Strength

The article presents the pull-out strength tests carried out on M10 expansion anchors in non-cracked and cracked concrete with a crack width cw = 0.30 mm. The breaking loads and the average pull-out strength of anchors in fibre-reinforced concrete substrates were determined. Fibre content ratios of 15, 30 and 50 kg/m3 were used. In addition, two different classes of concrete (C20/25 and C50/60) were tested. The addition of steel fibres caused a decrease in the pull-out strength by 5% for non-cracked concrete of C20/25 class and fibre content up to 30 kg/m3 and a further 7% for the remaining specified dosage. While for concrete of the C50/60 class, it a decrease in the pull-out strength of up to 20% was observed. For cracked concrete class C20/25 with crack initiation cw = 0.30 mm, the reduction was from 9% to 16% in relation to non-cracked concrete and a maximum of 18% for the fibre content of 50 kg/m3. The difference between the tensile load capacity of C50/60 class cracked and non-cracked concrete was lower than 5% and fell within the measurement error.

DIFFERENT GLUELINE THICKNESSES PULL-OUT BEHAVIOUR OF MENGKULANG GLULAM

2016 ◽  
Vol 78 (5-4) ◽  
Author(s):  
Tengku Anita Raja Hussin ◽  
Oon Vincent ◽  
Rohana Hassan
Keyword(s):  
Failure Modes ◽  
Load Capacity ◽  
Testing Machine ◽  
Maximum Load ◽  
Breaking Load ◽  
Glue Line ◽  
Resorcinol Formaldehyde ◽  
Line Thickness ◽  
Pull Out ◽  
Pull Out Strength

Timber connection is still facing inadequacy of engineering studies. Mechanical and adhesive joints are the two main types of connections being used for timber connection. In this study, pull-out strength test is carried to determine the best glue line thickness and the failure modes occur. Three different glue-line thicknesses of 2mm, 3mm and 4mm was tested with holes thicknesses of 14mm, 16mm and 18mm  respectively were drilled on 9 with 3 specimens of each thickness. This test is carried out until failure in the specimen by using the Universal Testing Machine with load capacity of 1000kN and at the rate of 2mm/min. Phenol-resorcinol-formaldehyde (PRF) is the adhesive used for the strengthening purposes with ratio of PRF hardener and resin of 1:5 was used in this experiment. The dowel glued-in steel dowel is 10 mm in diameter from S 235 steel type. For the results; The data shows that glue line thickness of 2mm does generate the highest maximum load compared to 3mm and 4mm of glue line thickness with the value of 2.394kN compared to 2.223kN and 1.789kN respectively. However, glue line thickness of 3mm shows highest breaking load of 1.714kN compared to 1.631kN of 2mm glue line thickness and 1.454kN of 4mm glue line thickness. Therefore, it is proven that the 2mm glue line thickness is more superior in strength and shear stress than 3mm and 4mm of glue line thickness.

scholarly journals The effect of tissue culture on suture holding strength and degradation in canine tendon

2009 ◽  
Vol 34 (5) ◽  
pp. 643-650 ◽  
Author(s):  
H. OMAE ◽  
C. ZHAO ◽  
Y.-L. SUN ◽  
M. E. ZOBITZ ◽  
S. L. MORAN ◽  
...  
Keyword(s):  
Tissue Culture ◽  
Tensile Load ◽  
Flexor Digitorum Profundus ◽  
Tendon Suture ◽  
Pull Out ◽  
Culture Model ◽  
Static Tensile ◽  
Tissue Culture Model ◽  
Flexor Digitorum ◽  
Pull Out Strength

The purpose of this study was to assess tendon metabolism and suture pull-out strength after simple tendon suture in a tissue culture model. One hundred and twelve flexor digitorum profundus tendons from 28 dogs were cultured for 7, 14, or 21 days with or without a static tensile load. In both groups increased levels of matrix metalloproteinase (MMP) mRNA was noted. Suture pull-out strength did not decrease during tissue culture. While the presence of a static load had no effect on the pull-out strength, it did affect MMP mRNA expression. This tissue culture model could be useful in studying the effect of factors on the tendon-suture interface.

scholarly journals PULL-OUT STRENGTH OF STEEL RODS BONDED INTO MENGKULANG (TARRIETIA JAVANICA) GLULAM AT FIVE DIFFERENT ANGLES TO THE GRAIN

2018 ◽  
Vol 30 (1) ◽  
pp. 67-74
Author(s):  
Mohamad WNN ◽  
Suliman NH ◽  
Kamarudin MK ◽  
Mohd-Amin N ◽  
Hassan R
Keyword(s):  
Pull Out ◽  
Pull Out Strength
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