Aggregate Effect on the Concrete Cone Capacity of an Undercut Anchor under Quasi-Static Tensile Load

Marcon, Marco; Ninčević, Krešimir; Boumakis, Ioannis; Czernuschka, Lisa-Marie; Wan‐Wendner, Roman

doi:10.3390/ma11050711

Cited by 21 publications

(17 citation statements)

References 32 publications

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“…However, its specific strength will depend on the size of aggregate grains, the rock material from which the grains are obtained and their proportion to the cement content. This also translates into the loadbearing capacity of the anchors fixed in concrete or, generally speaking, into the size of the breaking force of the anchor [1].…”

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confidence: 99%

Experimental Verification of Standard Recommendations for Estimating the Load-Carrying Capacity of Undercut Anchors in Rock Material

Jonak¹,

Karpiński²,

Siegmund³

et al. 2021

Adv. Sci. Technol. Res. J.

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The recommendations put forward in the International Standards for anchorage in concrete concerning the assessment of the load-carrying capacity of anchors (the pull-out force) embedded in natural rock material were verified. Regarding the predicted extent of surface failure we have shown, in earlier studies, substantial discrepancies between the strength test results for anchorages in the rock mass and the established standard recommendations for anchorages in concrete. As regards the industrial practice and the goals of the reported project, simplified calculation procedures that will facilitate the selection of optimal configurations for the layout of anchor holes, while being computationally effective and applicable under the industry-specific conditions are sought.

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mentioning

confidence: 99%

Experimental Verification of Standard Recommendations for Estimating the Load-Carrying Capacity of Undercut Anchors in Rock Material

Jonak¹,

Karpiński²,

Siegmund³

et al. 2021

Adv. Sci. Technol. Res. J.

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“…In the case of piles formed in the soil, the skin of concrete is modified by soil grains. In the study by Marcon et al [14], the potential effect of aggregate type and shape on the concrete capacity of an undercut anchor under tensile loading was investigated experimentally. A photogrammetric tool has been successfully used to gain insights in the failure mechanisms of the studied undercut anchor.…”

Section: Geotechnical Backgroundmentioning

confidence: 99%

Assessment of surface parameters of VDW foundation piles using geodetic measurement techniques

Muszyński

Wyjadłowski

2020

Open Geosciences

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This article presents in situ research on the side surface of Vor der Wand (VDW) foundation piles using 3D laser scanning and close-range photogrammetry to assess the morphology of pile concrete surface. Contemporary analytical methods for estimation of the bearing capacity of the foundation pile surface require determination of the parameters of the concrete roughness and the model of the surface being formed, which corresponds to the pile technology used. Acquiring these data is difficult due to the formation of piles in the ground and their subsequent work as a structure buried in the ground. The VDW pile technology is one of the widespread technologies of foundation pile used in practice. These piles exhibit a specific configuration of the lateral surface, which is related to the simultaneous use of auger drilling and casing that rotates in opposite directions. Two geodetic techniques most often used to measure the geometry of buildings are terrestrial laser scanning and close-range photogrammetry. To empirically verify the suitability of these two techniques for describing the VDW pile surface parameters, a two-stage field study was performed. In the first stage, the measurements of concrete test surfaces were conducted. This surface was formed in a smooth formwork and its roughness parameters (in accordance with ISO 25178-2: 2012) were calculated and compared with the reference surface. In the second stage, measurements of the secant VDW sheet pile wall protecting the deep excavation were carried out. The roughness parameters of the pile surface were calculated for the selected areas in diverse geotechnical conditions. The original procedure for processing data (obtained using the above techniques) for assessment of roughness parameters of unique concrete surfaces was presented. The conducted research demonstrates that a pulse scanner has very limited usefulness for determination of roughness parameters for very smooth concrete surface; however, the photogrammetry techniques give acceptable results. In regard to the VDW pile surface, the results obtained from both measurement techniques give satisfactory consistency of the roughness parameters. The relative errors of calculated roughness parameters do not exceed 29% (average 12%). The proposed procedure may improve the accuracy of the assumed friction factor between pile surface and soil for assessment of the pile shaft bearing capacity for various pile technologies and soil conditions.

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“…Considering concrete as a complex cementitious material, different mix compositions were investigated, with an attempt to investigate possible dominant influencing factors on the concrete failure. As a first considered factor, a comprehensive study was performed for six different concretes and two different anchor types in order to investigate a possible aggregate effect on the concrete cone capacity. Since the concrete is an aging material, the different curing conditions and the influence of concrete member age on the system response were investigated .…”

Section: Time‐dependent Propertiesmentioning

confidence: 99%

Comprehensive data collection for the development of anchorage lifetime prediction models

et al. 2019

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Nowadays, fastening systems represent a very important part of the construction industry due to their versatility and use in reconstruction. Therefore, it is essential to study and understand phenomena and effects influencing the lifetime of a fastening system. However, the mechanisms are complex and not yet fully understood. As a result, numerical models, which are reliable and are able to capture all involved effects, are needed. The basis of these models is a wide range of high quality data, for model development, calibration, and validation purposes. Within the 7‐year Christian Doppler Laboratory (CDL) of Life Cycle Robustness, an extensive concrete data base, consisting of short‐term mechanical properties of concrete, time‐dependent measurements as well as tests on full fastening systems, was generated. The material tests reach from compression, indirect tensile, and fracture tests to long‐term creep and shrinkage tests. Shear and pull‐out tests were carried out on bonded and mechanical anchors. In order to characterize the long‐term performance, sustained load and time to failure tests were conducted at a system level. In total, 12 concrete mixes were tested. This contribution will give an overview of the performed tests and will highlight the importance of sound experimental data.

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Aggregate Effect on the Concrete Cone Capacity of an Undercut Anchor under Quasi-Static Tensile Load

Cited by 21 publications

References 32 publications

Experimental Verification of Standard Recommendations for Estimating the Load-Carrying Capacity of Undercut Anchors in Rock Material

Experimental Verification of Standard Recommendations for Estimating the Load-Carrying Capacity of Undercut Anchors in Rock Material

Assessment of surface parameters of VDW foundation piles using geodetic measurement techniques

Comprehensive data collection for the development of anchorage lifetime prediction models

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