1,720,976 research outputs found
Mechanics of FRP shear strengthening of RC beams
No full textThis paper presents the results of an experimental/analytical study aiming at obtaining a clear understanding of
the underlying mechanisms of the shear strengthening of reinforced concrete beams with fibre reinforced
polymers (FRP). Through the definition of the generalised constitutive law of a bonded FRP sheet, of the
compatibility imposed by the shear crack opening, and of the appropriate boundary conditions depending on the
strengthening configuration, analytical expressions of the stress field in the FRP sheet crossing a shear crack are
obtained. These expressions allow to easily define closed-form equations for the effective strength of FRP
strips/sheets used for shear strengthening, as function of both the adopted strengthening configuration and some
basic geometric and mechanical parameters. The FRP contribution is then added to those of concrete and steel,
adequately weighed. The equations accuracy has been verified through correlation studies with experimental
results obtained from the literature and from laboratory tests on purposely under-designed real-scale beam
specimens, strengthened with different FRP scheme
Shear strengthening of beams with composite materials
No full textThis paper presents the results of an experimental/analytical study aiming at obtaining a clear understanding of the underlying mechanisms of the shear strengthening of reinforced concrete beams with fibre reinforced polymers (FRP). Through the definition of the generalised constitutive law of a bonded FRP sheet, of the compatibility imposed by the shear crack opening, and of the appropriate boundary conditions depending on the strengthening configuration, analytical expressions of the stress field in the FRP sheet crossing a shear crack are obtained. These expressions allow to easily define closed-form equations for the effective strength of FRP strips/sheets used for shear
strengthening, as function of both the adopted strengthening configuration and some basic geometric and mechanical parameters. The FRP contribution is then added to those of concrete and steel. The equations accuracy has been verified through correlation studies with experimental results obtained from the literature and from laboratory tests on purposely under-designed real-scale beam specimens, strengthened with different FRP schemes
NARP-HPLC di triacilgliceroli con rivelazione UV a serie di diodi. Approccio chemiometrico per la soluzione di problemi quali e quantitativi
No full textIl rinforzo a taglio di travi in c.a. mediante materiali compositi
No full textVengono presentate delle relazioni analitiche per progettare il rinforzo a taglio di travi in cemento armato mediante materiali compositi fibrorinforzati (FRP). Le equazioni elaborate consentono di prevedere il contributo del rinforzo in FRP allo stato limite ultimo, da sommarsi a quelli del calcestruzzo e dell’acciaio, in relazione alla configurazione prescelta per il rinforzo. Queste equazioni consentono di esprimere in termini analitici la resistenza efficace dei fogli/strisce di FRP in funzione delle caratteristiche geometriche e meccaniche del rinforzo e dalla geometria del problema. L’accuratezza delle equazioni è stata verificata attraverso studi di correlazione con risultati sperimentali raccolti da numerose prove esistenti in letteratura e da prove eseguite su 13 travi opportunamente progettate e sperimentate in laboratorio con diverse configurazioni del rinforzo in FRP
NARP-HPLC of triacylglycerols with light scattering detection. Chemometric approach for selectivities and response factors prediction
No full text
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
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