Tensile Strength of Short Headed Anchors Embedded in Steel Fibrous Concrete

Ta'an, S. A. Al; Mohammed, A.A.

doi:10.33899/rengj.2010.32877

Cited by 6 publications

(3 citation statements)

References 6 publications

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“…Undercut anchors are used in the technology of embedding steel structural elements in concrete engineering structures [1][2][3][4]. This anchor, in installation form, is embedded in a previously prepared hole.…”

Section: Introductionmentioning

confidence: 99%

Influence of Anchor Depth and Friction Coefficient Between Anchor and Rock on the Trajectory of Rock Masses Detachment

Jonak¹,

Karpiński²,

Wójcik³

2023

Adv. Sci. Technol. Res. J.

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This work presents the results of a FEA (Finite Element Analysis) concerning the propagation of the fracture trajectory during the detachment of rock masses. The analysis considers mechanical anchoring parameters, including the depth of anchoring and the friction between the anchor head and the brittle material. The analysis involved varying the effective anchorage depth h ef = 50, 100, and 150 mm, along with considering different coefficients of friction (μ) for the anchor head against the rock, including 0.15, 0.3, and 0.45. The results indicated that within the chosen range of anchorage depths, the extent of damage increases with the depth of anchor embedment. However, the depth of anchoring, considering the studied range of this parameter and the assumed mechanical properties of the rock, did not have a significant effect on the value of the angle cone (α 0 ) during the initial phase of the medium's destruction. For the friction coefficient μ = 0.15, there is a clear deep penetration into the fracture at its initial stage of development (at the initial angle of α 0 = -20°), promoting further spread of the fracture on the free surface. For larger values of the friction coefficient (μ = 0.3 and 0.45) -the trend is less pronounced (α 0 = -2°÷-8°) resulting in a decrease in the crack range.

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Section: Introductionmentioning

confidence: 99%

Influence of Anchor Depth and Friction Coefficient Between Anchor and Rock on the Trajectory of Rock Masses Detachment

Jonak¹,

Karpiński²,

Wójcik³

2023

Adv. Sci. Technol. Res. J.

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“…By employing the computational prowess of numerical modeling methods [6][7][8][9] (e.g., Finite Element Method (FEM) [10][11][12][13][14] or Boundary Element Method (BEM) [15][16][17] or machine learning [18][19][20]) in conjunction with experimental research [21][22][23][24] we have developed a detailed understanding of the actual behavior of engineering structures and their optimization. What has emerged from the extensive laboratory research [25,26], theoretical analyzes [27][28][29] and FEM simulations [30][31][32] conducted to date on the subject is that the pullout anchor strength, also referred to as its load-carrying capacity, is affected by a number of other factors, such as mechanical parameters of concrete (e.g., [33][34][35][36]), effective embedment depth [37], the breakout anchor design [38,39], the anchor head geometry [40][41][42][43][44], or concrete reinforcement [45][46][47][48]…”

Section: Introductionmentioning

confidence: 99%

The Effect of Undercut Anchor Diameter on the Rock Failure Cone Area in Pullout Tests

Jonak¹,

Karpiński²,

Wójcik³

et al. 2022

Adv. Sci. Technol. Res. J.

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The numerical analysis was conducted using the FEM ABAQUS software to establish the impact of various undercut anchor diameters on the rock breakout cone formation. The central focus of the investigations was on the rock breakout prism, which tends to be approximated to a cone or a quadrilateral pyramid, including its characteristic parameter, the angle of failure cone α. Assuming that the embedment depth and the undercut anchor head angle were constant for the considered range of anchor head diameters, it remains unclear, however, precisely how the anchor head diameter affects the value of the failure cone angle, and thus the surface area of the full breakout prism. This conclusion stands in confirmation of our former considerations regarding the impact of the anchor head angle on the size of the breakout surface. Furthermore, it is supported by the results obtained from the mechanical model simulation of the anchor-rock system, where the anchor head angle and the effective embedment depth were determined as significant factors affecting the assumed rock breakout failure. The underlying aspect of the reported investigation was to evaluate the effectiveness of the non-conventional rock breakout technology performed with an undercut anchor, whose primary factors were both the pullout force and the assumed volume of the rock cone.

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“…To improve the macroscale structural performance of concrete members, different fibers are dosed into the concrete mix [7]. The positive effect of fiber addition in concrete is fracture toughness [8], CivilEng 2021, 2 557 which is visible in the form of prevention from crack formation and propagation in loaded elements [9]. The thin façade panels made of fiber concrete meet the current architectural and environmental requirements.…”

Section: Introductionmentioning

confidence: 99%

Influence of Different Fiber Dosages on the Behaviour of Façade Anchors in High-Performance Concrete

et al. 2021

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The behaviour of façade anchors in high performance fiber reinforced concrete (HPFRC) has not been investigated in sufficient detail in recent years. The regulations in the European Technical Approvals also do not fully describe the load-bearing capacity of anchor systems. Due to the increase in the production of HPFRC elements, it is necessary to analyse the impact of added fibers in the concrete composition on the behaviour of anchors. In particular, the behaviour of anchors in filigree façade elements, which is one of the main application areas of the programme of polypropylene (PP) fiber-reinforced concrete, is therefore analysed. With a sufficient content of PP fibers surrounding the steel anchors oriented in an optimal direction, the fibers may enhance both the load-bearing capacity of anchors and the ductility of concrete. However, unfavourable effects on the installation process or even on the load-bearing capacity may also occur due to unfavourable fiber orientation. Therefore, tensile and punching tests were carried out in uncracked concrete with different types of anchor systems containing a tension anchor and an adjustable spacer bolt. The PP fiber content of the concrete component varied during the tests.

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Tensile Strength of Short Headed Anchors Embedded in Steel Fibrous Concrete

Cited by 6 publications

References 6 publications

Influence of Anchor Depth and Friction Coefficient Between Anchor and Rock on the Trajectory of Rock Masses Detachment

Influence of Anchor Depth and Friction Coefficient Between Anchor and Rock on the Trajectory of Rock Masses Detachment

The Effect of Undercut Anchor Diameter on the Rock Failure Cone Area in Pullout Tests

Influence of Different Fiber Dosages on the Behaviour of Façade Anchors in High-Performance Concrete

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