Gotowe bibliografie tematyczne / Anchors

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Gotowa bibliografia na temat „Anchors”

Autor: Grafiati

Data publikacji: 4 czerwca 2021

Data aktualizacji: 7 września 2023

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Artykuły w czasopismach na temat "Anchors"

Llauradó, Paula Villanueva, Rafael Cascón Porres, Alberto Sanchidrián Blázquez, Francisco Santos Olalla i Fernando Gómez Álvarez. "Flexural Tests for Efficiency Evaluation of Spike Anchors on CFRP-Strengthened Concrete". Materials 16, nr 1 (24.12.2022): 164. http://dx.doi.org/10.3390/ma16010164.

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Spike anchors are one of the most promising techniques to prevent or delay debonding in FRP reinforcement sheets. There are several parameters affecting the anchors’ capacity, such as the embedment length and dowel angle. Regardless of the anchors’ capacity, their contribution to the overall strength of the anchored joint is affected by a larger number of variables, including the bonded length behind the anchors, the number and arrangement of the anchors, and the contact surface between the anchor fan and the FRP sheet. This paper presents experimental results of 10 tests conducted on concrete beams. In the tests, anchored joints reached peak loads up to 155% of those of unanchored, bonded joints. The main finding of the research is that the bond length in front of and behind the anchors affects both the peak load and the overall behaviour, with unbonded anchored joints exhibiting a poor behaviour and premature slippage of the anchor, without achieving its failure due to fibre rupture.

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Liao, Hung-Jiun. "Ground anchors corrosion - the beginning of the end". MATEC Web of Conferences 195 (2018): 03001. http://dx.doi.org/10.1051/matecconf/201819503001.

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Ground anchor corrosion is a common problem for anchored slopes in Taiwan. It is partly due to the humid climate condition and abundant groundwater in the slope and partly due to poor corrosion protection of anchor design and construction. In 2010, an anchored slope at Taiwan National Freeway No. 3 failed suddenly after 13 years of service. It buried 3 cars and killed 4 people. It caught the public’s attention and initiated the island-wide program on over hauling the anchors slopes in Taiwan. Since this event, the Ministry of Transportation and Communication (MOTC) of Taiwan government had launched an extensive inspection and maintenance program for the existing anchored slopes along the freeways, highways, and railways. Totally, more than 100,000 ground anchors had been inspected. This paper will evaluate the findings from this inspection program. It includes (1) the status quo of the anchors regarding the corrosion condition and the residual load that remained on the existing anchors; (2) remedial measures taken to sustain the serviceability of existing corroding anchors; (3) measures taken to enhance the long-term durability of new anchors without changing the strand material and the practice of anchor construction commonly used by the local contractors.

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El Sharnouby, M. M., i M. H. El Naggar. "Numerical investigation of the response of expansion anchors used to attach helical pile connectors to concrete foundations". Canadian Journal of Civil Engineering 37, nr 6 (czerwiec 2010): 866–77. http://dx.doi.org/10.1139/l10-025.

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This paper evaluates the performance of expansion anchors used to attach helical pile connectors to foundations. The anchors’ response to pullout loads was evaluated using nonlinear finite element analysis with the aid of the commercial software, Abaqus. The connector capacity under horizontal movement of the foundation for different anchor diameters, embedment depths, and anchors’ spacing is reported. It was found that the pre-tension load had no influence on the anchor ultimate capacity, but affected the anchor response at service load levels and the displacement at failure. Under pullout loading, increasing the anchor diameter resulted in a more brittle response, but did not affect the ultimate capacity when the concrete tensile strength dominated the response. No interaction between anchors was observed for spacing ≥ 1.67 times the anchor’s embedment depth. A modification to the helical pile connector configuration is proposed.

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Zhang, Huawen, i Scott T. Smith. "Fibre-reinforced polymer (FRP)-to-concrete joints anchored with FRP anchors: tests and experimental trends". Canadian Journal of Civil Engineering 40, nr 11 (listopad 2013): 1103–16. http://dx.doi.org/10.1139/cjce-2012-0525.

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This paper reports an investigation on the influence of anchors made from fibre-reinforced polymer (herein FRP anchors) when applied to FRP-to-concrete bonds. The experimental section of the paper consists of 44 tests on FRP-to-concrete joints of which 20 joints are unanchored controls and 24 joints are anchored with FRP anchors. The influence of plate width, plate thickness and plate elastic modulus are considered as these parameters have received little to no attention to date. An increase in plate width is shown to considerably enhance the joint strength although the influence of the anchor decreases. The other two test parameters are shown to be less influential. The analytical section of the paper involves regression modelling of components of a large test database on FRP-to-concrete joints anchored with FRP anchors compiled elsewhere by the authors. The models, which are calibrated in best-fit and design forms, allow experimental trends to be readily observed and quantified within the bounds of the experimental data for three influential parameters of plate length, angle of anchor insertion, and plate width. Finally, a combined regression model is proposed and it is evaluated with tests on FRP-to-concrete joints anchored with multiple anchors.

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Mei, Kui Hua, Zhi Tao Lv i Ji Wen Zhang. "The Static Test Study on Anchors of CFRP Cables". Advanced Materials Research 671-674 (marzec 2013): 1635–40. http://dx.doi.org/10.4028/www.scientific.net/amr.671-674.1635.

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The axial performance of CFRP is excellent, while the lateral compression strength and shear strength are low, thus they can’t be anchored by traditional anchors. A new type of adhesive anchor was designed and five experimental cables were fabricated and the static tests were carried out. In the tests, the tensile capacity, bond strength and pullout behavior of CFRP cables anchors filled with resin were discussed. The efficiency coefficients and the load-slip behaviors of the bond-type anchors and the uniformities of the stresses in the tendons were studied. Several conclusions are drawn which have become powerful evidences for using the bond-type anchors in the first cable stayed bridge with CFRP cables in China.

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Liu, Ying Li, Tie Zhu Jiang, Jun Hong Huan i Fu Quan Xu. "Experimental Study on Tension Performance of Anchor Group". Advanced Materials Research 912-914 (kwiecień 2014): 666–74. http://dx.doi.org/10.4028/www.scientific.net/amr.912-914.666.

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The torque-controlled expansion anchors, undercut anchors,bonded anchors and special inverted conical chemical anchors subjected to tension load, which including single anchor, two anchors, four anchors and eight anchors are tested. Failure mode and tension performance of anchor group are investigated, and test value and calculative value of ultimate load are compared. Experimental results show that some anchor group occur the concrete cone failure under tension load, and others occur steel failure under tension load. Test value and calculative value of ultimate load are compared, and the result meets well.

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Chen, Yung-Chung, i Jiann T. Lin. "Multi-anchored sensitizers for dye-sensitized solar cells". Sustainable Energy & Fuels 1, nr 5 (2017): 969–85. http://dx.doi.org/10.1039/c7se00141j.

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Deng, Jun, Minting Zhong, Yifeng Zheng i Miaochang Zhu. "Experimental Study on the Durability of Steel Anchors for Prestressed CFRP Laminates under Accelerated Galvanostatic Corrosion". Materials 15, nr 16 (18.08.2022): 5665. http://dx.doi.org/10.3390/ma15165665.

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The novelty of the present study is to address the durability of corroded anchors for prestressing CFRP laminates. Two types of steel anchors, clamp anchors and wedge anchors, were used to prestress CFRP laminates and then subjected to steel corrosion through a galvanostatic acceleration approach, which was followed by tensile tests. Compared to clamp anchors, wedge anchors showed a superior durability performance in terms of their prestress retention, anchor efficiency, and resistance to the slippage of the CFRP laminate. After accelerated corrosion for 144 h, the clamp anchor exhibited a prestress retention of 79.1% and an anchorage efficiency of 55%, and the percentages became 9.0% and 100% for the wedge anchor. The slippage rates of the clamp anchor and the wedge anchor were 0.036 mm/kN and 0.026 mm/kN, respectively. Therefore, the wedge anchor, which exhibited higher prestress tension and anchorage efficiency, performed better than the clamp anchor. The present work provides an apparatus for exploring the corrosion-induced durability of steel anchors and experimental evidence that helps refine the provision in the guidelines for addressing anchor durability.

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Peccin da Silva, Anderson, Andrea Diambra, Dimitris Karamitros i Shiao Huey Chow. "A Cyclic Macro-Element Framework for Consolidation-Dependent Three-Dimensional Capacity of Plate Anchors". Journal of Marine Science and Engineering 9, nr 2 (13.02.2021): 199. http://dx.doi.org/10.3390/jmse9020199.

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This paper presents a new macro-element modelling framework for plate anchors which enables the effect of pore water pressure changes and the related evolution of soil strength during the process of cyclic loading and consolidation to be captured. The proposed modelling framework combines an advanced macro-element model for plate anchors, expanded to capture the cyclic loading behaviour, with a simple one-dimensional model of undrained shearing and consolidation for a soil element representative of the whole soil mass around the anchor. The representative soil element tracks the effects of changes in effective stress on the soil strength, which in turn governs the anchor capacity in the macro-element model. The two modelling components are linked through a mobilised capacity compatibility condition. It will be firstly shown that such modelling framework is able to capture the expected changes in an anchor’s capacity related to cyclic pore pressure generation and consolidation under one-dimensional cyclic loading of the anchor. Then, the model will be used to explore the plate anchor’s behaviour and failure mechanisms under loading conditions which mobilise its full three-dimensional cyclic loading capacity. The macro-element model will identify some conflicting mechanisms (i.e., the anchor’s kinematic/rotation and soil weakening/strengthening) governing the three-dimensional capacity of the anchor.

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Liu, Haixiao, Yancheng Yang i Jinsong Peng. "A Unified Model for Analyzing Comprehensive Behaviors of Deepwater Anchors". Journal of Marine Science and Engineering 9, nr 8 (23.08.2021): 913. http://dx.doi.org/10.3390/jmse9080913.

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Anchors may exhibit various complicated behaviors in the seabed, especially for deepwater anchors including gravity installed anchors (GIAs) and drag embedment plate anchors (drag anchors), stimulating the development of an efficient analytical tool that applies to a variety of anchors. The present paper introduces a unified model for analyzing different anchor behaviors in both clay and sand, consisting of unified concepts, mechanical models, and analytical procedure. The kinematic behaviors of the anchors are classified uniformly as three types, i.e., diving, pulling out, and keying. By utilizing the least-force principle, various anchor properties, such as the ultimate pullout capacity (UPC), failure mode, movement direction, embedment loss, and kinematic trajectory, can all be determined by the combination and analysis of the three behaviors. Applications of the model are demonstrated summarily, by solving the UPC and the failure mode of anchor piles and suction anchors, the kinematic trajectory of drag anchors in a single soil layer or layered soils, the maximum embedment loss (MEL) of suction embedded plate anchors (SEPLAs) and OMNI-Max anchors, and the kinematic behavior of OMNI-Max anchors. Compared to existing theoretical methods, this unified model shows strong applicability and potentiality in solving a variety of behaviors and properties of different anchors under complicated seabed conditions.

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Rozprawy doktorskie na temat "Anchors"

Hu, Shenghua, i 胡盛华. "FRP-strengthened RC slabs anchored with FRP anchors". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2011. http://hub.hku.hk/bib/B47849800.

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Existing reinforced concrete (RC) structure can be strengthened upon the addition of externally bonded high-strength light-weight fibre-reinforced polymer (FRP) composites. An abundance of research over the last two decades has established the effectiveness of the externally bonded FRP via extensive experimental testing. Perhaps the most commonly occurring failure mode though is premature debonding of the FRP and debonding generally occurs at strains well below the strain capacity of the FRP. Debonding failures are undesirable as they are typically brittle and represent an under-utilisation of the FRP material. A straightforward means to prevent or at least delay debonding is by the addition of mechanical anchors, however, research to date on anchors is extremely limited. Of the various anchor concepts examined to date by researchers, this dissertation will focus on anchors made from FRP which are herein referred to as FRP anchors. The details and results of a program of research on the performance of FRP anchors in FRP-strengthened structures are presented in this dissertation. An extensive review of exiting literature helps establish knowledge gaps which serve to justify the need and the scope of the research reported herein. A novel bow-tie FRP anchor concept is then proposed and tested in smaller-scale single-shear FRP-to-concrete joint assemblages as well as larger-scale simply-supported FRP-strengthened RC slabs. The anchors are shown to increase the strength and slip capacity of the joints by up to 41 % and almost 600 %, respectively, in comparison with unanchored control joints. The anchors are then shown to increase the load and deflection capacity of slabs by 30 % and 110 %, respectively, above an unanchored control slab. In addition to strength, it is the ability of FRP anchors to introduce deformability into FRP-strengthened RC slabs which is particularly beneficial in order to produce safer structures. An analytical model is then developed which is based on a novel quad-linear moment-curvature response which can capture the complete load-deflection response of the FRP-strengthened slabs anchored with FRP anchors. The analytical modeling approach enables closed-form equations to be derived which can then be used by design engineers to relatively easily construct load-deflections responses and accurately predict member responses. Following the concluding comments for the project as a whole, future research topics of relevance are identified.
published_or_final_version
Civil Engineering
Master
Master of Philosophy

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Steele, Catherine A. "Measuring career anchors and investigating the role of career anchor congruence". Thesis, Coventry University, 2009. http://curve.coventry.ac.uk/open/items/4d808ce0-304f-08e3-36e3-c12a4460c409/1.

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This thesis empirically examines the career orientations inventory (COI) as a measure of career anchors and then, using this measure, it goes on to investigate the relationship between career anchor congruence and work related outcomes, specifically job satisfaction and organisational commitment. The psychometric properties of the 40 item COI (presented by Igbaria and Baroudi, 1993) were explored by the administration of the measure to a sample of 658 individuals from 27 organisations in the UK. Through factor analysis an eight factor structure was demonstrated in line with that proposed by Schein (1993). The factor structure was replicated with a second sample. The COI demonstrated good levels of internal consistency (.59-.83) and test retest reliability (.68-.90). Similarly it was deemed to have acceptable levels of face validity and construct validity when compared to Mantech’s (1983) Work Values Questionnaire (WVQ). An analysis of the prevalence of career anchors and the demographic differences within the current sample was undertaken. This analysis provided evidence to suggest that certain career anchors may be increasing in prevalence while others are decreasing. These findings are in line with current research on the way in which workplace changes are impacting upon careers (Baruch, 2004). Evidence was found that indicated gender differences in scores on the COI subscales. Specifically women were found to score higher on the lifestyle anchor and men to score higher on the general management anchor. Differences were also found between the age groups considered in this study in the general management, creativity, pure challenge and lifestyle anchors. Interaction effects for age and gender were found for the general management and sense of service anchors. The COI was then used to develop a commensurate measure of job career anchors. This job career anchor measure discriminated between jobs within one police organisation. The measure was then used to explore the relationship between career anchors, career anchor congruence (congruence between individual and job career anchors), job satisfaction and organisational commitment. Evidence was found to suggest that career anchors and career anchor congruence have a direct effect on job satisfaction (predicting 10% and 4% of the variance respectively). The analysis also showed support for the role of career anchor congruence as a moderator to the relationship between career anchors and job satisfaction. This thesis makes full consideration of the academic contributions and practical implications of the research presented whilst also considering its limitations. A number of suggestions for the direction of future research have been made.

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Ljungberg, Jakob. "Pullout test of rock bolts at the Lima Hydropower station : -Assessment of the test method". Thesis, KTH, Betongbyggnad, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-192448.

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During construction of dams, rock bolts are in general installed in the interface between concrete and rock as an extra safety measure against overturning failure. These bolts are however not allowed to be taken into consideration for the stability calculations of large dams. New standards and new design criterias have increased the requirements of the safety of the old dams, leading to a need for expensive rehabilitation and strengthening. It is possible that consideration of these bolts in stability calculations may lead to money being saved. In order to do so more information about the long term strength of these bolts is needed. One way of getting this information has been the destructive testing of old dugout bolts found during reconstruction works. At the Lima hydropower station in Sweden, this kind of testing was made. The test rig used had a design where a piston pressed down on the rock around the bolt in order to pull it out. The question was raised if this could affect the failure load of the bolt. In this thesis, an attempt was made to answer this question using finite element methods. Models of a rock bolt was made in Abaqus, where one model included the piston and one where it was not. The connection between the bolt and the rock was modelled with nonlinear springs and friction, and the results were then compared between the cases and with experimental data. The results showed that the resulting force-deformation curves may be affected by the piston in cases where the dominant failure mode was adhesive failure, which would influence failure loads and deformations. Since so little was known about the properties of the rock and grout at Lima however, it is difficult to say to which extent the test rig has affected these results.

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Bengal, Steven T. "The Impact of Implausible Anchors". The Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1343763460.

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Knight, Simon John. "Abstracting anchors from documents". Thesis, University of Southampton, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.243046.

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Singh, Neena. "Biosynthesis of glycophospholipid anchors". Case Western Reserve University School of Graduate Studies / OhioLINK, 1990. http://rave.ohiolink.edu/etdc/view?acc_num=case1054926816.

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Bill, Jinbiao Bill. "Valuation anchors and premium multiples". Thesis, Lancaster University, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.535988.

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CODARO, ROSANA SILVINA. "CAREER ANCHORS AND JOB SATISFACTION". PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2015. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=25844@1.

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O presente estudo visa analisar a relação entre satisfação no trabalho e o alinhamento do emprego do indivíduo com suas habilidades, necessidade e valores, denominadas âncoras de carreira. Para tanto, foi realizada uma pesquisa quantitativa, um survey baseado no Modelo de Âncoras de Carreira de Schein e Van Maanen (2013) e na Escala de Satisfação do trabalho de Siqueira (2008), para uma amostra não probabilística de 96 alunos de uma escola de Administração de uma universidade privada de Rio de Janeiro. A partir da pesquisa concluímos que não existe associação significativa entre a satisfação no trabalho e o alinhamento com a âncora de carreira. A âncora que apresentou maior frequência, independente do gênero do entrevistado, foi Estilo de Vida, indicando a tendência de se buscar uma carreira que permita equilibrar a vida profissional e a vida pessoal. Por outro lado, foi observado que participantes do sexo masculino priorizam mais a âncora Autonomia e os de sexo feminino a de Competência Técnica / Funcional. Por fim, também identificamos na pesquisa que os indivíduos autônomos são mais satisfeitos que os assalariados, os de sexo masculino estão mais satisfeitos no trabalho do que os de sexo feminino e que existe uma associação positiva entre anos de experiência e satisfação no trabalho.
The present study explores the relationship between job satisfaction and congruence between the individual s actual occupation and his talents, needs and values, namely his career anchors. For that purpose, a quantitative survey using Schein e Van Maanen s Career Anchor model (2013) and Siqueira s Job Satisfaction survey (2008) was performed for a non-probabilistic sample of 96 undergraduate and graduate students at the Business School of a private University in Rio de Janeiro. The results of that survey showed that there is no significant association between satisfaction at work and congruence with career anchor. The most frequent career anchor for both genders was Lifestyle, showing a trend towards a career that allows some balance between professional and personal life. Male participants prioritize more Autonomy and Independence, females prioritize more Technical and Functional Competence. The study showed also that self employed individuals are more satisfied than the ones employed, that among the employed individuals, men are more satisfied at work than women and that there is a significant association between years of experience and work satisfaction.

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Layton, Emily Gwilliam. "Anchors of Religious Commitment in Adolescence". BYU ScholarsArchive, 2010. https://scholarsarchive.byu.edu/etd/2407.

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This study explores adolescent religious commitment using qualitative data from a religiously diverse (Jewish, Christian, and Muslim) sample of 80 adolescents from California and New England. It identifies a new construct, "anchors of religious commitment," to describe what adolescents are committing to as a part of their religious identity. Seven anchors of religious commitment are discussed: (a) religious traditions, rituals, and laws; (b) God; (c) faith traditions or denominations; (d) faith community members; (e) parents; (f) scriptures or sacred texts; and (g) religious leaders. Various forms of expression are identified within each anchor of religious commitment, with issues of relationships and authority being most common among the different anchors. The findings broaden the conceptual understanding of commitment as a relational construct and not just a behavioral or attitudinal construct. Implications for the future research on adolescent religious commitment are discussed, as well as practical implications for parents and religious leaders.

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Jonnalagadda, Silpa P. "Standardization of test methodology: a comparison between three suture anchors". Thesis, Texas A&M University, 2005. http://hdl.handle.net/1969.1/2442.

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Suture anchors have been used successfully in many applications in orthopedics. They have been in the forefront of research in the recent years. Most of the studies, though, have focused on human suture anchors. This research concentrates on the veterinary aspect of suture anchors. Currently, there is no standardization of testing methods. One of the objectives of this research is to develop a standardized method of testing that is clinically relevant, at least for veterinary use. Another objective of this research is to compare the durability of three commercial suture anchors manufactured by Innovative Animal Products, Securos Veterinary Orthopedic Inc. and IMEXTM by comparing their pullout loads after cyclic loading. This research also aims to determine whether suture anchor failure due to eyelet cut-out or suture wear-out resulting from the sharp edges of the eyelet is the major cause of failure of bone-suture anchor-bone complexes. Cyclic loading of suture anchors during testing for durability has not been used previously even though such loading plays an important role in determining the stability of the bone-suture anchor-bone construct. The response of the construct to this type of testing followed by pullout tests has been explored in this research.

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Książki na temat "Anchors"

Ancient Egyptian anchors and the sea. Oxford: DE Publications, 2002.

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Sabatini, P. J. Ground anchors and anchored systems. Washington, D.C: U.S. Dept. of Transportation, Federal Highway Administration, Office of Bridge Technology, 1999.

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Ground anchors and anchored structures. New York: Wiley, 1991.

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Boer, Claudia den. Anchors. [Breda]: The Eriskay Connection, 2016.

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Co, Life@Work, red. Ethical anchors. Nashville, Tenn: Word Pub., 2000.

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Das, Braja M. Earth anchors. Amsterdam: Elsevier, 1990.

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John, Long. Climbing anchors. Wyd. 3. Guilford, Conn: Falcon Guides, 2013.

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Bacus, Kathleen. Anchors aweigh. New York: Dorchester, 2008.

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John, Long. Climbing anchors. Evergreen, Colo: Chockstone Press, 1993.

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Das, Braja M. Earth anchors. Ft. Lauderdale, FL: J. Ross Pub., 2007.

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Części książek na temat "Anchors"

Cederholm, Dan. "Anchors". W Web Standards Solutions, 95–107. Berkeley, CA: Apress, 2004. http://dx.doi.org/10.1007/978-1-4302-1089-4_7.

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Chodza, Mehmet, Mehmet Demirhan i Olgar Birsel. "Anchors". W Fundamentals of the Shoulder, 251–58. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-94702-6_20.

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Ortigao, Alberto. "Ground Anchors". W Selective Neck Dissection for Oral Cancer, 1–2. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-12127-7_14-1.

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Kumar, Abhishek. "Substance Anchors". W Beginning PBR Texturing, 143–55. Berkeley, CA: Apress, 2020. http://dx.doi.org/10.1007/978-1-4842-5899-6_14.

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Seedhouse, Erik. "Government Anchors". W Mars via the Moon, 27–56. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-21888-5_2.

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Seedhouse, Erik. "Commercial Anchors". W Mars via the Moon, 57–77. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-21888-5_3.

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Thomson, L. M., T. Fontaine, A. Mehlert i M. A. J. Ferguson. "Glycosylphosphatidylinositol Anchors". W Chemical Probes in Biology Science at the Interface of Chemistry, Biology and Medicine, 227–33. Dordrecht: Springer Netherlands, 2003. http://dx.doi.org/10.1007/978-94-007-0958-4_18.

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Meyer, D. C., G. Lajtai i C. Gerber. "Suture Anchors". W Shoulder Arthroscopy and MRI Techniques, 47–58. Berlin, Heidelberg: Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/978-3-642-55604-3_4.

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Ortigao, Alberto. "Ground Anchors". W Encyclopedia of Earth Sciences Series, 426–27. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-73568-9_14.

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Sidney, George. "Anchors Aweigh". W 100 Film Musicals, 20–21. London: British Film Institute, 2011. http://dx.doi.org/10.1007/978-1-84457-568-8_4.

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Streszczenia konferencji na temat "Anchors"

Zhao, Yanbing, i Haixiao Liu. "Key Techniques in Simulating Comprehensive Anchor Behaviors by Large Deformation Finite Element Analysis". W ASME 2017 36th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/omae2017-61348.

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With the application of innovative anchor concepts and advanced technologies in deepwater moorings, anchor behaviors in the seabed are becoming more complicated, such as 360-degree rotation of the anchor arm, gravity installation of anchors with high soil strain rate, and keying and diving (or penetration) of anchors. As a very important component of the installation or mooring system, anchor line connects the anchor and the anchor handling vessel (AHV) or floating moored platform. With moving of the AHV or platform, anchor line produces a space movement, and forms a reverse catenary shape and even a three-dimensional profile in the soil. Numerical analysis on the behaviors of anchor lines and deepwater anchors requires techniques that can deal with large strains and deformations of the soil, track changes in soil strength due to soil deformation, strain rate and strain softening effects, appropriately describe anchor-soil friction, and construct structures with connector elements to conform to their characteristics. Being an effective tool of large deformation finite element analysis, the coupled Eulerian-Lagrangian (CEL) method is advantageous in handling geotechnical problems with large deformations, where a traditional Lagrangian analysis is coupled with an Eulerian phase of material advection. This paper gives an overview of several key techniques in the CEL analysis of comprehensive behaviors of deepwater anchors, including construction of the embedded anchor line and the anchor line in the water, installation of gravity installed anchors (GIAs), keying or diving of drag anchors and GIAs, and implementation of the omni-directional arm of GIAs. Numerical probe tests and comparative studies are also presented to examine the robustness and accuracy of the proposed techniques. The aim of this paper is to provide a numerical framework to analyze the comprehensive behaviors of anchor lines and deepwater anchors.

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Wan, Xiaopei, Guoqiu Li, Yujiu Yang i Zhenhua Guo. "Augmenting Anchors by the Detector Itself". W Thirty-First International Joint Conference on Artificial Intelligence {IJCAI-22}. California: International Joint Conferences on Artificial Intelligence Organization, 2022. http://dx.doi.org/10.24963/ijcai.2022/191.

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Usually, it is difficult to determine the scale and aspect ratio of anchors for anchor-based object detection methods. Current state-of-the-art object detectors either determine anchor parameters according to objects' shape and scale in a dataset, or avoid this problem by utilizing anchor-free methods, however, the former scheme is dataset-specific and the latter methods could not get better performance than the former ones. In this paper, we propose a novel anchor augmentation method named AADI, which means Augmenting Anchors by the Detector Itself. AADI is not an anchor-free method, instead, it can convert the scale and aspect ratio of anchors from a continuous space to a discrete space, which greatly alleviates the problem of anchors' designation. Furthermore, AADI is a learning-based anchor augmentation method, but it does not add any parameters or hyper-parameters, which is beneficial for research and downstream tasks. Extensive experiments on COCO dataset demonstrate the effectiveness of AADI, specifically, AADI achieves significant performance boosts on many state-of-the-art object detectors (eg. at least +2.4 box AP on Faster R-CNN, +2.2 box AP on Mask R-CNN, and +0.9 box AP on Cascade Mask R-CNN). We hope that this simple and cost-efficient method can be widely used in object detection. Code and models are available at https://github.com/WanXiaopei/aadi.

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de Aguiar, Cristiano S., José Renato M. de Sousa, Luís V. S. Sagrilo, Gilberto B. Ellwanger i Elisabeth C. Porto. "A Simple Approach for Determining the Holding Capacity of Torpedo Anchors Embedded in Cohesive Soils". W ASME 2013 32nd International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/omae2013-10809.

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Torpedo anchors have been used in various offshore applications especially due to its low cost installation and the ability to withstand high inclined loads. This anchor consists of a shaft in which flukes are welded in order to increase the soil-anchor contact region and, consequently, its holding capacity. Since this anchor presents a singular geometry, different from a regular cylindrical anchor/pile, the computation of the holding capacity of a torpedo anchor is not straightforward. In a previously presented work, the holding capacities of typical torpedo anchors were assessed with a finite element (FE) model in which both the anchor and the surrounding soil are represented with three-dimensional finite elements. However, this FE model demands a significant computational effort and, consequently, simpler approaches would be desirable in order to design these anchors. Relying on the FE model and a parametric study, this paper presents simple formulae to predict the holding capacities of torpedo anchors embedded into cohesive soils. These formulae are employed to predict the holding capacities of two different torpedo anchors, which are compared to those estimated with the FE model. Results agreed very well indicating that this simpler approach may be employed to quickly evaluate the holding capacities of these anchors.

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Farrokhzad, M. A. "Stability Design Criteria for Above-Ground Unrestrained Pipeline Anchors and Line-Stops, Considering Frictional Forces Caused by Thermal Expansion and Weight of Pipeline". W 2006 International Pipeline Conference. ASMEDC, 2006. http://dx.doi.org/10.1115/ipc2006-10593.

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Pipeline anchors and line stops are essential elements for design and construction of a pipeline system. Anchors limit and isolate the thermal growth of the pipeline and control as well as guide it in favorable directions. Steel piles are often used to serve as anchors. Designing of anchors should include a combination of reactions between pipe to shoe-anchor, shoe-anchor to steel pile and steel pile to soil as well as stability consideration of soil at the location where anchor is applied. Many factors have to be considered in the engineering design of pipeline anchors and line stops, including loads, displacements and maximum allowable forces. Industrial-wise, expansion growth and frictional forces for above-ground pipelines have to account for the basic design conditions as well as bending and possible elastic instability of the pipe and its anchors due to the longitudinal compressive forces. Stress calculation formulas for anchors tend to consider the ambient to design temperature as the design criteria for thermal loads, however due to the complexity of reactions between static-dynamic frictional forces and thermal expansion forces, anchors may be subjected to higher loading in lower temperature than design temperature. This effect can be crucial to the stability of anchors during commissioning. This paper considers and establishes the stability design criteria due to temperature for anchors and associated components subjected to thermal and frictional forces.

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Dwenger, Fabian, Klaus Kerkhof, Veit Birtel i Thilo Froehlich. "Experiments on Seismic Performance of Piping Mounted to a Concrete Floor by Post-Installed Anchors". W ASME 2015 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/pvp2015-45777.

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In nuclear power plants, non-structural systems such as piping are often connected to concrete floors by post-installed anchors. During an earthquake, the anchors have to transfer the dynamic loads between the structural and mechanical components of the power plant. The dynamic behavior of the coupled system concrete-anchor-piping is not only governed by the main components but also by the load-bearing behavior of the anchors and the dynamic behavior of pipe supports. Stiffness reduction of supports can lead to contact problems. Impact loads due to gaps between the anchor plate and concrete floor occur when the anchors show significant displacements. Uncertainties concerning possible interactions of the coupled system concrete-anchor-piping can lead to unexpected failure modes during the system response. To investigate these possible interactions, experiments and detailed numerical simulations regarding the dynamic behavior of the coupled system concrete-anchor-piping are carried out. Results of experiments and numerical simulations on the seismic performance of a mock-up consisting of piping, anchors and a structural concrete member subjected to crack cycling are presented.

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Hesar, Majid, i Raquel Maciel. "Geotechnical Design of Vertically Loaded Hybrid Suction-Gravity Anchors". W ASME 2017 36th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/omae2017-61503.

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The Sapinhoá and Lula North-East fields, 300km offshore Rio de Janeiro, Brazil are the two pilot fields of the Pre-salt development strategy. Field architecture consists of satellite wells connected to a spread moored FPSO in each of the fields. Through a design competition Petrobras and Partners selected the de-coupled riser system developed by Subsea 7. In each field two BSRs (Buoy Supporting Risers) anchored at 250m below waterline support the rigid risers on one side and flexible flowlines running to the FPSO on the other. Each BSR displaces close to 10,000t of water and provides a nominal net up thrust of 3,250t. This Paper highlights the engineering challenges and the solution developed for the large-scale foundation anchors that support these massive BSRs in the harsh environment of the Santos Basin in 2140m water depth. Vertically below each corner of the BSR tank an 8m diameter by 18m penetration suction anchor houses the receptacles for the pair of tethers. Tension in the tethers was tuned to optimise the system stiffness (to minimise lateral BSR excursion orbits and avoid clash of risers and FPSO mooring lines) while requiring minimum anchor capacity. Four ballast modules of 150t each sit on top of each suction anchor to provide the remainder of the required uplift resistance. Soil conditions across both fields consist of soft silty clay. A geotechnical FE model of the suction anchor in Abaqus was used to evaluate the interaction of the structure, surrounding soil and trapped water beneath the top cap. The model was used to develop the complete load-displacement curves of the system during the undrained design current events. A consolidation FE model using the Soft Soil model in PLAXIS showed that the hybrid anchor/ballast system under sustained uplift loading is stable throughout the design life for the level of sustained design load. Although the LRFD verification format of suction anchors and gravity anchors are well covered in the design codes, there seems to be a gap in the coverage of this particular type of hybrid anchor. The governing condition was found to be the long term drained pull-out capacity under sustained loading with the assumption of slowly leaking suction port and air evacuation port at the top.

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Fisher, Jeremy, i Alan Sprague. "Anchors". W the 42nd annual Southeast regional conference. New York, New York, USA: ACM Press, 2004. http://dx.doi.org/10.1145/986537.986592.

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O’Loughlin, Conleth D., Anthony P. Blake, Dong Wang, Christophe Gaudin i Mark F. Randolph. "The Dynamically Embedded Plate Anchor: Results From an Experimental and Numerical Study". W ASME 2013 32nd International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/omae2013-11571.

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Dynamically embedded plate anchors are rocket shaped anchors that penetrate to a target depth in the seabed by the kinetic energy obtained through free-fall. After embedment the central shaft is retrieved leaving the anchor flukes vertically embedded in the seabed. The flukes constitute the load bearing element as a plate anchor. This paper provides an overview of an experimental and numerical study undertaken to provide the first performance data for this anchor concept. The experimental work includes geotechnical centrifuge modelling and field tests using three different reduced anchor scales, whereas the numerical work focused on investigating anchor capacity for a rage of geometries, embedment depths and seabed conditions. The experimental work indicates that expected tip embedments are in the range 2 to 3.3 times the anchor length and depend on the impact velocity, anchor mass and shear strength of the soil. As with other plate anchors, the anchor needs to key before maximum capacity can be mobilised. Both the centrifuge and field experiments show that this keying and pullout behaviour is typical of other vertically installed plate anchors, where the main issue is the loss in embedment during keying. Both the experimental and numerical studies showed that the capacity of the DEPLA is much higher than that of other dynamically installed anchors with capacities up to 40 times the dry weight of the plate and plate bearing capacity factors of about 15.

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O’Loughlin, Conleth D., Mark D. Richardson i Mark F. Randolph. "Centrifuge Tests on Dynamically Installed Anchors". W ASME 2009 28th International Conference on Ocean, Offshore and Arctic Engineering. ASMEDC, 2009. http://dx.doi.org/10.1115/omae2009-80238.

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Dynamically installed anchors are torpedo shaped and are designed so that after release from a designated height above the seafloor will penetrate to a target depth in the seabed by the kinetic energy obtained through free-fall and through the self-weight of the anchor. This paper presents results from an extensive series of centrifuge tests undertaken to both inform expected anchor penetrations in normally consolidated clay and form the basis for calibrating an analytical anchor embedment model. The database indicates that for anchors with no flukes, expected anchor tip embedment depths are 2 to 3 times the anchor length for impact velocities approaching 30 m/s, with a dependence on both impact velocity and to a greater extent anchor mass. The centrifuge data were used to calibrate an analytical embedment model, based on strain rate dependent shearing resistance and fluid mechanics drag resistance. Back-figured strain rate parameters increase with increasing impact velocity and are in the range 0.2–0.5 (logarithmic function) and 0.06–0.12 (power function). As the strain rates in the centrifuge tests are approximately 200 times equivalent strain rates in the field, the lower bound strain rate parameters are considered more appropriate for field conditions.

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Dahlberg, Rune, i Jan Mathisen. "Consistent Design Codes for Anchors and Mooring Lines". W ASME 2002 21st International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2002. http://dx.doi.org/10.1115/omae2002-28424.

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As the water depth of hydrocarbon discoveries becomes deeper, the technological challenges related to the design of mooring systems increases. Changing from steel catenary mooring systems (CMS) to fibre rope taut mooring systems (TMS) has been accompanied by an immense focus on how to qualify and approve fibre rope material for use in a TMS. This involves items related to specifications for manufacturing, handling and testing fibre ropes, as well as calibration of safety factors to use in the design of TMSs. One consequence of moving to a TMS is that the anchors will have to take more uplift load than in a conventional CMS, which makes the anchors a more critical component of the mooring system than before. The types of anchor normally available to the designer of a TMS are pile anchors, suction anchors and various types of plate anchors. Anchors of all types are designed and installed in ever-deeper water, but the safety of the designed mooring systems varies with the design code adopted. There is thus an obvious need for an industry standard, a design code for each anchor type that is calibrated based on structural reliability analysis using the current experience and knowledge in the industry. This paper compares anchor design codes that use total safety factors (TSF) with the DNV design code that uses partial safety factors and failure consequence classes. Examples of design codes for station-keeping systems that adopt the TSF format are API RP2SK and (assumed herein) the ISO code, which is under development. The comparison demonstrates that use of the safety format adopted in the DNV code provides more flexibility and ensures a uniform safety level of all components in a mooring system than the TSF format. If all types of anchor were designed to the same safety level it would be possible to compare anchors without worrying about differences in safety. A typical approach for calibration of a design code is described.

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Raporty organizacyjne na temat "Anchors"

Bjella, Kevin, Daniel Vandevort i Sarah Kopczynski. Preliminary testing of expedient ground anchor solutions for guyed towers in remote cold regions : considerations for cold remote regions with limited tools. Engineer Research and Development Center (U.S.), lipiec 2023. http://dx.doi.org/10.21079/11681/47328.

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Ground anchors connected to guy wires for tower structures in cold climates suffer from frost heaving, which causes loss of wire tension and subsequent structural instability. It is necessary to understand what ground anchors are available to resist this tendency yet are still capable of expedient installation in remote areas. To that end, three metal, traditional ground-anchor types (arrowhead, bullet, and penetrating auger) and one novel polyvinyl chloride (PVC) T-post anchor were evaluated in frozen gravels and frozen silts at a research facility in Fairbanks, Alaska. Criteria included installation capability, failure loading, and removal ability. Additionally, expedient installation techniques for use in field conditions were also demonstrated. All three traditional ground anchors failed to penetrate frozen gravels. The penetrating auger also failed to penetrate frozen silts, but the arrowhead and bullet anchors did penetrate frozen silts with difficulty. The PVC anchor is capable of being installed only in a predrilled pilot hole. Under flexural load, the arrowhead anchor cable failed at 3686.72 lb, and the bullet anchor cable failed at 1753.44 lb. The PVC slid out of its hole at a direct-pull force of 1978.24 lb and failed under flexural stress at 202.32 lb.

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Cheok, Geraldine S., i Long T. Phan. Post-installed anchors:. Gaithersburg, MD: National Institute of Standards and Technology, 1998. http://dx.doi.org/10.6028/nist.ir.6096.

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Edwards, Sebastian. Exchange Rates as Nominal Anchors. Cambridge, MA: National Bureau of Economic Research, grudzień 1992. http://dx.doi.org/10.3386/w4246.

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Wegner, Dana M., Colan D. Ratliff i Kevin Lynaugh. Fouled Anchors: The CONSTELLATION Question Answered. Fort Belvoir, VA: Defense Technical Information Center, wrzesień 1991. http://dx.doi.org/10.21236/ada241916.

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Siebrits, Krige, i Estian Calitz. Fiscal anchors and sustainable fiscal policy. UNU-WIDER, sierpień 2023. http://dx.doi.org/10.35188/unu-wider/2023/406-9.

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Flood, Robert, i Michael Mussa. Issues Concerning Nominal Anchors for Monetary Policy. Cambridge, MA: National Bureau of Economic Research, wrzesień 1994. http://dx.doi.org/10.3386/w4850.

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StJohns, M. Automated Updates of DNS Security (DNSSEC) Trust Anchors. RFC Editor, wrzesień 2007. http://dx.doi.org/10.17487/rfc5011.

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Ebersman, P., W. Kumari, C. Griffiths, J. Livingood i R. Weber. Definition and Use of DNSSEC Negative Trust Anchors. RFC Editor, wrzesień 2015. http://dx.doi.org/10.17487/rfc7646.

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Rozemeijer, M. J. C., C. Chun, R. Cramer, A. Korving i C. Meeldijk. Assessing the stability and mobilisation of crab-pot-strings anchored with Bruce anchors under different marine conditions. IJmuiden: Wageningen Marine Research, 2021. http://dx.doi.org/10.18174/560823.

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Cain, P. Modifications to Irad Gage flexible sonic probe extensometer anchors. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1985. http://dx.doi.org/10.4095/304818.

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