1,721,327 research outputs found
Integrity of the adhesive bonding in steel beams strengthened with a carbon fibre composite plate
No full textEThOS - Electronic Theses Online ServiceGBUnited Kingdo
Effect of plate end and adhesive spew geometries on stresses in retrofitted beams bonded with a CFRP plate
No full textAdhesive bonding technique has been widely used in construction as an alternative to conventional joint techniques, particularly in retrofitting schemes using carbon fibre reinforced polymer (CFRP) plates. Spew fillets and end tapers have been suggested for reducing the stress concentration in the adhesive layer of retrofitted beams. In this paper, finite element (FE) analyses were employed to determine the effects of the spew fillet and the taper on interfacial adhesive stresses and the strains in the CFRP plate. A total of eight cases with different configurations of spew fillet and different tapers have been considered. The results largely agree with the findings on lap joints, but the effect of spew fillets is far less than that for lap joints. Moreover, the results show a combination of an inside taper in the plate and a triangular fillet give the most reduction in the maximum interfacial stresses. The results of the FE analyses also show that the effect of spew fillet size on the strain close to the plate end, which confirms previous analytical and experimental results
Behaviour under static loading of metallic beams reinforced with a bonded CFRP plate
No full textCFRP plates have been employed widely in the repair and upgrading of bridges and building in recent years. When they are used in the upgrading of metallic beams, the weakest link is the adhesive bonding, and plate peel is the most important failure mode due to the high stress concentration at the end of the plates. This paper presents the results of a study on the influencing factors on the strengthen of the metallic beams reinforced by different types of CFRP plates, the effects of the tapers at the plate ends and of the spew fillets beyond the plate ends. The test results also validate the theoretical results of stress analysis. The use of longer and tapered plates is suggested as a solution for improvement
Adhesive bonding in steel beams strengthened with CFRP
No full textThe strengthening of metallic beams with a bonded carbon-fibre-reinforced polymer (CFRP) plate has found many applications in bridge and building structures in recent years. The structural behaviour of the adhesive bonding in this technique is the most distinct element to be considered. In this paper, previous analytical, experimental and numerical studies under static and fatigue loadings by the present authors are reviewed. An S –N curve based on the peak interfacial stresses is proposed to predict the fatigue life to crack initiation of the retrofitted beams. An equation to predict the fatigue life during the crack propagation has also been developed. Finally, the geometric effects of the spew fillet and of the taper at the plate end of the retrofitted beam are discussed. In the conclusion, design recommendations for steel beams strengthened by bonded CFRP plates are detailed based on the findings obtained from the studies presented.<br/
FIGURE 4 in A new felt scale genus Macroporicoccus gen. n. (Hemiptera: Coccoidea: Eriococcidae) from China, with a redescription of Macroporicoccus ulmi (Tang & Hao) comb. n.
No full textFIGURE 4. Adult female Macroporicoccus ulmi (Tang & Hao). Where: A. antenna; B. a pair of coeloconic sensilla; C. thoracic spiracle; D. trilocular pore; E. quinquelocular pore; F. fore or middle leg; G. pore plate; H. hind claw; I. ventral setae; J. anal ring; K. microtubular duct; L. macrotubular duct; M. macrodisc pore.Published as part of Nan, Nan, Deng, Jun & Wu, San'An, 2013, A new felt scale genus Macroporicoccus gen. n. (Hemiptera: Coccoidea: Eriococcidae) from China, with a redescription of Macroporicoccus ulmi (Tang & Hao) comb. n., pp. 170-182 in Zootaxa 3722 (2) on page 176, DOI: 10.11646/zootaxa.3722.2.3, http://zenodo.org/record/526731
Stress analysis of steel beams reinforced with a bonded CFRP plate
No full textThe use of carbon fibre reinforced polymers (CFRP) composites to upgrade structures and, in particular, to extend the lives of steel beams has wide applications. An important feature of the reinforced beam is the significant stress concentration in the adhesive at the ends of CFRP plate, where there is a discontinuity caused by the abrupt termination of the plate. In this paper, an analytical solution is presented to calculate the stresses in the reinforced beam under mechanical as well as thermal loads. The solution has been extended by a numerical procedure to CFRP plates with tapered ends, which can significantly reduce the stress concentration. Finite element analysis was employed to validate the analytical results, and a parametric study was carried out to show how the maximum stresses have been influenced by the dimensions and the material properties of the adhesive and the adherends
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
FIGURE 5 in The taxonomy of the Japanese oak red scale insect, Kuwania quercus (Kuwana) (Hemiptera: Coccoidea: Kuwaniidae), with a generic diagnosis, a key to species and description of a new species from California
No full textFIGURE 5. Kuwania raygilli Wu & Gullan sp. nov., first-instar nymph. A, a pair of coeloconic sensilla; B, multilocular disc pore; C, long ventral seta; D. claw of hind leg; E, short ventral seta; F, discoidal pore; G, dorsal seta.Published as part of Wu, San'An, Nan, Nan, Gullan, Penny & Deng, Jun, 2013, The taxonomy of the Japanese oak red scale insect, Kuwania quercus (Kuwana) (Hemiptera: Coccoidea: Kuwaniidae), with a generic diagnosis, a key to species and description of a new species from California, pp. 291-307 in Zootaxa 3630 (2) on page 302, DOI: 10.11646/zootaxa.3630.2.5, http://zenodo.org/record/21574
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
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