Tensile behaviour of cast-in headed anchors in ambient-temperature cured geopolymer concrete

Karmokar, Trijon; Mohyeddin, Alireza; Lee, Jessey

doi:10.1016/j.engstruct.2022.114643

Cited by 12 publications

(2 citation statements)

References 24 publications

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“…Concrete cone breakout failure typically governs the load‐bearing performance, and hence the design of a fastening for certain combinations of concrete and steel strengths, as well as geometrical arrangements, such as anchor embedment depth, and distance from a free edge of the concrete member. Effects of the anchor head size and the concrete member thickness are investigated by Nilforoush et al 4 Specific aspects of non‐standards concrete material properties are presented with respect to aggregate type in the study by Ninčević et al, 5 curing state in the study by Ninčević and colleagues, 6–8 the influence of low‐emission concrete binders in the study by Al‐Yousuf and colleagues, 7,9 and the inclusion of fiber reinforcement in the study by Spyridis and Mellios 10 . Beyond typical quasi‐static loads, research has identified the performance of anchors against concrete cone breakout failure in case of external confinement/prestressing, 11,12 dynamic and seismic actions, 13–16 and fire 17–20 .…”

Section: Load Resistance Of Fastenings In Concrete According To the C...mentioning

confidence: 99%

Extended concrete capacity design method for anchors close to non‐rectangular edges

Mellios,

Spyridis,

Bergmeister

2023

Structural Concrete

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Fastenings in concrete are widely applicable in construction. A significant benefit of fastening technology lies in the fact that it can adapt to various geometries and construction sequences. As a result, the need to design and realize a fastening in structural elements with unconventional geometric configurations can be encountered. Existing design standards rely on the concrete capacity design (CCD) method for concrete‐related failures, which typically covers detailing situations with rectangular configurations of the fastenings and the concrete members. However, the lack of guidelines for a wider range of applications may lead to over‐conservative dimensioning or design constraints. This study investigates the influence of beveled concrete edges on the load‐bearing behavior of anchors. As part of the research, a series of experiments and numerical simulations were conducted. The results derived from the investigations are used to develop an analytical concept that extends the area of applicability of the CCD method and can be used for reliable dimensioning of fastenings close to non‐rectangular concrete edges and geometrical boundaries.

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Section: Load Resistance Of Fastenings In Concrete According To the C...mentioning

confidence: 99%

Extended concrete capacity design method for anchors close to non‐rectangular edges

Mellios,

Spyridis,

Bergmeister

2023

Structural Concrete

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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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Influence of surface cracking, anchor head profile, and anchor head size on cast-in headed anchors in geopolymer concrete

Karmokar,

Moyheddin

2023

Front. Struct. Civ. Eng.

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In this study, the concrete cone capacity, concrete cone angle, and load–displacement response of cast-in headed anchors in geopolymer concrete are explored using numerical analyses. The concrete damaged plasticity (CDP) model in ABAQUS is used to simulate the behavior of concrete substrates. The tensile behavior of anchors in geopolymer concrete is compared with that in normal concrete as well as that predicted by the linear fracture mechanics (LFM) and concrete capacity design (CCD) models. The results show that the capacity of the anchors in geopolymer concrete is 30%–40% lower than that in normal concrete. The results also indicate that the CCD model overestimates the capacity of the anchors in geopolymer concrete, whereas the LFM model provides a much more conservative prediction. The extent of the difference between the predictions by the numerical analysis and those of the above prediction models depends on the effective embedment depth of the anchor and the anchor head size. The influence of concrete surface cracking on the capacity of the anchor is shown to depend on the location of the crack and the effective embedment depth. The influence of the anchor head profile on the tensile capacity of the anchors is found to be insignificant.

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Tensile behaviour of cast-in headed anchors in ambient-temperature cured geopolymer concrete

Cited by 12 publications

References 24 publications

Extended concrete capacity design method for anchors close to non‐rectangular edges

Extended concrete capacity design method for anchors close to non‐rectangular edges

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

Influence of surface cracking, anchor head profile, and anchor head size on cast-in headed anchors in geopolymer concrete

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