Bearing characteristics and failure mechanism of a novel plate-short anchor structure for tunnel crack reinforcement

Zhou, Ping; Zhou, Feicong; Gong, Li; Ao, Weilin

doi:10.1016/j.engfailanal.2022.106160

Cited by 10 publications

(7 citation statements)

References 29 publications

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“…The strength of the vast majority of the tested specimens reported in the literature was dictated by premature failure modes [ 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 , 49 , 50 , 51 , 52 , 53 , 54 , 55 , 56 ]. In fact, the mechanisms that occurred in most of the experimental tests were concrete pry-out failure, concrete splitting, concrete breakout, concrete edge failure, or anchor failure.…”

Section: Comparison Between Model Results and Tests Results Borrowed ...mentioning

confidence: 99%

“…Moreover, the phenomena that have been investigated for cast-in and post-installed shear anchors are premature failure modes, i.e., concrete edge failure, concrete splitting, anchor failure, concrete breakout, concrete pry-out failure, cyclic load failure, collapse due to prying actions [ 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 , 49 , 50 , 51 , 52 , 53 , 54 , 55 , 56 ]. Conversely, strength dictated by the concrete that surrounds the anchors by a pure shear mechanism has not been investigated, although this failure mode is the one that provides the greatest strength, so it should be the aim of anchor design as long as the geometric conditions allow it.…”

Section: Introduction: State-of-the-art About Post-installed Concrete...mentioning

confidence: 99%

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Ultimate Shear Force of an Any Anchor Group Post-Installed into Concrete

Foraboschi

2023

Materials

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This paper is devoted to the fastening system that consists of a number of anchors of approximately equal effective embedment depth, called “anchor group”, embedded into hardened concrete, used to transmit forces transverse to the anchors from an attachment to the concrete. The anchor group is far from the edges and is subjected to no more than marginal axial forces. Being post-installed, rather than cast-in, the embedded end of each anchor is not hooked, and no nuts, washers, or plates are attached to the embedded shaft. The paper focuses on the transverse forces that can be transmitted across an anchor group from an attachment to the concrete. The paper provides an analytical model for predicting the maximum (ultimate) shear force that an anchor group can bear, thus called “shear strength”. The model hence allows the structural designer to predict the shear strength of an anchor group post-installed into concrete. The model is based on five mechanical assumptions, which were established from a wide-ranging numerical analysis. Model predictions turned out to be, on average, 20% lower than the results of experiments performed on cast-in anchor groups borrowed from literature. The comparison verifies model accuracy, considering that the tested anchor groups benefitted from the extra-strength furnished by nuts and washers attached to the embedded shaft. Model predictions were also compared to code provisions; the former resulted to be up to one third of the latter. The paper presents and comments those comparisons, as well as all mathematical development. Applications of the model to wide-ranging case studies is presented and discussed as well.

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Section: Comparison Between Model Results and Tests Results Borrowed ...mentioning

confidence: 99%

Section: Introduction: State-of-the-art About Post-installed Concrete...mentioning

confidence: 99%

Ultimate Shear Force of an Any Anchor Group Post-Installed into Concrete

Foraboschi

2023

Materials

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“…During the service life of a tunnel, the concrete lining is susceptible to cracking due to various factors, including geological conditions, material deterioration, and engineering activities within the protective zone [1]. When cracks in the lining reach a certain extent, they can lead to issues such as leakage, deformation, spalling, or delamination [2,3], which, in turn, can impact the performance and operational safety of the tunnel [4,5]. Therefore, accurate detection of the geometric parameters of concrete structural cracks is crucial, as it provides guidance for subsequent repairs, reduction of repair costs, minimization of resource wastage, and enhancement of the sustainability of infrastructure.…”

Section: Introductionmentioning

confidence: 99%

Sustainable Infrastructure Maintenance: Crack Depth Detection in Tunnel Linings via Natural Temperature Variations and Infrared Imaging

Gu,

Liu,

2024

Sustainability

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In this research, we propose the use of infrared detection methods for identifying cracks in the tunnel lining of concrete structures. Through thermal simulation experiments on pre-existing cracks, we investigate the heat conduction patterns in cracked linings under natural temperature variations. The influence of temperature differences inside and outside the lining, crack depth, and crack width on the temperature distribution on the inner surface of the lining is analyzed by using a controlled variable approach. This exploration aims to assess the feasibility and applicable conditions of using infrared thermal imaging technology for detecting lining crack defects, contributing to sustainable maintenance of infrastructure. We further validate the experimental approach through numerical simulations. Considering the temperature distribution on the inner surface of the lining, it becomes feasible to comprehensively determine the location and depth of cracks. This offers a novel and rapid inspection method for tunnel lining cracks, thereby enhancing the sustainability of tunnel infrastructure.

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“…They found that the lining could be reinforced through crack grouting and shotcrete support. Zhou [ 11 ] proposed a new plate-type anchor structure to reinforce tunnel cracks and experimentally verified the state changes of the plate-short anchor assembly structure in a cracked state. According to their comparison of the bearing capacities of the anchor-reinforced and unreinforced parts of a specimen, reinforcement could improve the bearing by at least 16%.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Performance Evaluation of Repair Materials Suitable for Mechanical Pressurizing Equipment for Cross-Sectional Repair of Concrete Box Structures

Choi

Kim

Yu³

et al. 2023

Materials

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This study entailed performance tests to confirm the bond performance of the proposed new repair material and the pressurization effect of the developed mechanical pressurizing equipment. The physical property changes of the new repair material were reviewed by varying the mixing ratio of high aluminate cement (HAC)-mixed mortar. Strength tests were performed according to the mixing ratios of polymer and silica fume to improve the bond performance. To improve water retention, the mixing ratios of the cellulose and nylon fibers were adjusted, and the change in water retention was measured. The proposed repair material mixing ratio yielded the best performance when pressure was applied to the repair surface. Comparing the existing repair materials and the new repair material prepared by adjusting the ratios of HAC-mixed mortar, cellulose fiber, redispersible powder resin, and other factors confirmed that the new repair material has a high bond strength.

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Bearing characteristics and failure mechanism of a novel plate-short anchor structure for tunnel crack reinforcement

Cited by 10 publications

References 29 publications

Ultimate Shear Force of an Any Anchor Group Post-Installed into Concrete

Ultimate Shear Force of an Any Anchor Group Post-Installed into Concrete

Sustainable Infrastructure Maintenance: Crack Depth Detection in Tunnel Linings via Natural Temperature Variations and Infrared Imaging

Mechanical Performance Evaluation of Repair Materials Suitable for Mechanical Pressurizing Equipment for Cross-Sectional Repair of Concrete Box Structures

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