118,037 research outputs found
Influence of Interfacial Bond Properties on the Structural Response of Concrete Bonded with FRP
No full textFibre-reinforced polymer (FRP)-bonded concrete performance relies heavily on bond; therefore, bond-slip models have been developed with interfacial bond properties. Since the structural behaviour of the test specimens bonded with FRP and the failure mechanisms depend on these bond qualities, it is vital to know how sensitive they are. This work examines the interfacial bond-slip characteristics of a bond-slip model with two curves, an ascending and a descending curve, for their sensitivity. The results show that the fracture energy related to interfacial debonding significantly influences the maximum load capacity, while the shape of the ascending curve significantly influences the effective bond length. These results highlight the importance of considering the interfacial bond-slip properties when designing and evaluating concrete structures retrofitted with FRP
A study of secondary moments and moment redistribution in continuous prestressed concrete beams
No full textSIGLEAvailable from British Library Document Supply Centre-DSC:DX189110 / BLDSC - British Library Document Supply CentreGBUnited Kingdo
Sensitivities of Interfacial Bond-Sip Properties in Predicting the Behaviour of FRP-Strengthened Concrete
No full textThe performance of FRP-bonded concrete is heavily influenced by the properties of the bond between the two materials. Various bond-slip models incorporating interfacial bond properties have been developed to understand and predict this behaviour. In a bond-slip model, the interfacial bond properties are specified in terms of the bond shear stress at the interface and the associated slip or interfacial fracture toughness (energy). Therefore, it is crucial to determine the sensitivity of these properties to the structural response, as it affects the prediction of FRP-bonded test samples and debonding failure modes. This study investigates the sensitivities of interfacial bond-slip properties using a bond-slip model comprising ascending and descending curves. The results indicate that the interfacial fracture energy significantly affects the maximum load resistance, while the ascending curve has a substantial impact on the effective bond length. These findings shed light on the importance of interfacial bond properties in determining the performance and behaviour of FRP-bonded concrete structures
Generalised analytical solutions for linear and non-linear bond–slip models for externally bonded FRP to a concrete substrate
No full textThis article presents a set of novel analytical derivations from generalised bond–slip models using first principles, which can be used to predict experimental outcomes, including maximum load resistance, load-slip response, and strain throughout the bonded length. The generalised bond–slip models are constructed in a way that can be translated into various shapes, including linear, nonlinear and exponential forms, all of which have been used in the literature to explain the bond–slip behaviour of epoxy-bonded FRP on concrete. When the prerequisites for the derivations are satisfied, as demonstrated in this paper, a comprehensive validation of a bond–slip model is possible. Furthermore, the transformability of the generalised bond–slip models and the analytical nature of the derivations also allowed for the comparison of several bond–slip models simultaneously
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe 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
Square Dancing with the Stars to Enhance Dynamic Hirschman Linkages?
No full textIn this Presidential Address, the author takes the reader on a reconnaissance of his life and time as a regional scientist. He points out scenery he found scintillating along the way, hoping that some may pick up the banner and chew on a few of the ideas for a while. He suggests a revisit to Albert O. Hirschman’s notion of key sectors and more empirical analysis related to Marcus Berliant’s and Masahisa Fujita’s notion of knowledge creation and transfer.Presidential Address, San Antonio, Texas, March 29, 2014 (53rd Meetings of the Southern Regional Science Association
Appropriate Similarity Measures for Author Cocitation Analysis
No full textWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Letter from unknown writer to Jesse L. Boyce
No full textLetter to Jesse L. Boyce from unknown author (possibly Jack) about the investigation into the powder magazine located in the Grand Canyon. Some personal news is included in the letter such as the writer's marriage to the daughter of C.A. Taylor, former Supervisor of Cochise County
Dispelling the Myths Behind First-author Citation Counts
No full textWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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