30,708 research outputs found
Diagonal shear behavior of historic walls strengthened with composite reinforced mortar (CRM)
No full textComposite reinforced mortar (CRM) represents an innovative strengthening solution for existing masonry structures. CRM is comprised of a composite grid embedded within an inorganic matrix (mortar) and it is applied as externally bonded reinforcement of masonry members. The composite grid bears the tensile stresses whereas the inorganic matrix is responsible for the stress-transfer between the composite grid and the substrate. CRM showed promising results in improving the mechanical properties of different masonry members, such as walls and arches. However, a full understanding of the mechanical behavior of CRM strengthened masonry members is still missing, which hinders the formulation of reliable CRM design guidelines. In this paper, an experimental investigation of the in-plane behavior of masonry walls made by historical bricks and strengthened with a CRM comprised of a glass fiber composite grid embedded in a lime-based mortar is presented and discussed. The parameters studied are the wall dimension and type (double leaf with and without diatoni). Furthermore, the effect of steel anchors on the strengthened wall capacity is investigated. The results obtained are finally analyzed using simple analytical formulations
Diagonal compression of masonry walls strengthened with composite reinforced mortar
No full textThe use of inorganic matrix composites to strengthen and retrofit existing masonry and
concrete structures has been gaining increasing interest in the last years. Among them, composite
reinforced mortar (CRM) systems are a promising solution to increase the shear and flexural
capacity of masonry panels. CRMs are comprised of a relatively thin inorganic matrix layer
reinforced with a bi-dimensional grid made with high-strength fibers impregnated with an organic
matrix. They are compatible with the substrate due to the use of inorganic matrix, have good
durability and high-strength-to weight ratio due to the use of reinforcing composite materials. CRM
systems are still in their infancy and limited research is available in the literature.
In this paper, masonry walls constructed with historical bricks typical of the north of Italy were
strengthened with a CRM system including a glass composite grid and a lime-based mortar and
were subjected to diagonal compression. Three walls were strengthened with the CRM and one was
used as a control specimen. The results obtained showed that the CRM system significantly
increased the shear strength of the masonry panels subjected to diagonal compression
Out-of-plane maximum resisting bending moment of masonry walls strengthened with FRCM composites
No full textFiber reinforced composites represent an alternative to more traditional techniques for
strengthening and retrofitting existing masonry structures. Numerous studies have been
carried out to characterize the mechanical and bond behavior of Fiber Reinforced
Cementitious Matrix (FRCM) composites applied to different substrates and to provide
reliable parameters for the estimation of the FRCM composite contribution to the
strengthened member. However, limited work was done to provide reliable design procedures
for FRCM strengthened structures and the only available guideline is the American ACI
549.4R-13.
In this paper, a new analytical procedure to estimate the out-of-plane maximum resisting
bending moment of FRCM strengthened masonry walls is provided. The accuracy of the
proposed procedure is assessed by comparison of the analytical provisions with
corresponding experimental results from a database comprising 63 FRCM strengthened walls
collected from the literature. The results obtained are compared with those computed
according to the ACI 549.4R-13 approach and to a method based on the procedure by
Ascione et al. (2015). The new procedure proposed provides accurate results, whereas the
ACI 549.4R-13 approach and the method based on the procedure by Ascione et al. (2015)
generally tend to underestimate the experimental maximum resisting bending moment
providing a low accuracy
Erratum to: Effect of moderate red wine intake on cardiac prognosis after recent acute myocardial infarction of subjects with Type 2 diabetes mellitus (Diabetic Medicine, (2006), 23, 9, (974-981), 10.1111/j.1464-5491.2006.01886.x)
No full textIn an article by Marfella et al, the author name C. Saron is incorrect and should be listed as C. Sardu. Therefore the correct author list is: R. Marfella, F. Cacciapuoti, M. Siniscalchi, F. C. Sasso, F. Marchese, F. Cinone, E. Musacchio, M. A. Marfella, L. Ruggiero, G. Chiorazzo, D. Liberti, G. Chiorazzo, G. F. Nicoletti, C. Sardu, F. D'Andrea, C. Ammendola, M. Verza and L. Coppola.In an article by Marfella et al, the author name C. Saron is incorrect and should be listed as C. Sardu. Therefore the correct author list is: R. Marfella, F. Cacciapuoti, M. Siniscalchi, F. C. Sasso, F. Marchese, F. Cinone, E. Musacchio, M. A. Marfella, L. Ruggiero, G. Chiorazzo, D. Liberti, G. Chiorazzo, G. F. Nicoletti, C. Sardu, F. D'Andrea, C. Ammendola, M. Verza and L. Coppola
Analisi delle caratteristiche in risonanza magnetica di 35 neoplasie intracraniche del cane confermate istologicamente e confronto con la letteratura
No full textIn medicina veterinaria il ricorso alla diagnostica
per immagini mediante risonanza magnetica
(RM) sta conoscendo una sempre più ampia
diffusione; pertanto, nell’ottica di un miglioramento
delle possibilità diagnostiche, terapeutiche
e prognostiche, diviene necessità sempre
più impellente la standardizzazione dei reperti
di diagnostica per immagini in relazione alla
conferma istologica. In questo studio le caratteristiche
RM di 35 neoplasie intracraniche del
cane confermate istologicamente sono state
confrontate con quelle riportate nella letteratura
scientifica internazionale pubblicata tra il
1995 e il 2012. L’obiettivo principale di questo
confronto è quindi quello di ampliare le conoscenze
sulle possibili espressioni patologiche
delle neoplasie analizzate. La peculiare casistica
presentata rende possibile, inoltre, fornire
dati originali su alcuni tipi di patologie tumorali
poco frequenti e poco descritte in medicina
veterinari
[Evaluation of the intestinal absorption of iron orally administered as chondroitin sulfate in normal subjects]
No full textThe behaviour of sideremia has been studied in order to assess the intestinal absorption of iron of a new compound, ferric chondroitin sulfate after oral administration in 12 normal volunteers. After administration of 90 mg of iron as ferric chondroitin sulfate, sideremia rose from a basal value of 88 +/- 27 micrograms/dl to a value of 128 +/- 22 micrograms/dl at the third hour. Variance analysis showed that the increases were statistically significant (F = 27.7; p less than 0.00001). In the same subjects, the test was carried out in accordance with a randomised crossover design in two periods after administration of 91 mg of ferritin iron: sideremia rose from a basal value of 92 +/- 27 micrograms/dl to a value at the third hour of 97 +/- 28 micrograms/dl, moderate increases but statistically significant (F = 3.2; P = 0.0354). Variance analysis by repeated measurements showed that increases in sideremia were significantly higher after iron administration as ferric chondroitin sulfate than after administration of ferritin iron (F = 13.18; p = 0.0042). This study documents the good bioavailability of the iron contained in ferric chondroitin sulfate
Cost-effectiveness analysis of HPV vaccination and HPV DNA primary screening for cervical cancer in Italy
No full textAn analytical method to estimate the resisting bending moment of FRCM strengthened masonry walls subjected to out-of-plane load
No full textA large number of existing masonry structures are in need of strengthening and retrofitting. A possible alternative to traditional strengthening techniques is represented by the use of externally bonded fiber reinforced composites. Between them, fiber reinforced cementitious matrix (FRCM) composites, which are comprised of high strength fiber open meshes embedded within inorganic matrices, represent a promising solution to strengthen existing masonry structures. Although FRCM composites were shown to be effective in strengthening unreinforced masonry (URM) walls subjected to shear (in-plane load), bending (out-of-plane load), and predominant axial load, the only design guideline available is the American ACI 549.4R-13. In this paper, an analytical procedure to compute the resisting bending moment of URM walls strengthened with FRCM composites against out-of-plane load is proposed. The analytical procedure is based on simple equilibrium conditions and takes into account the characteristics of the masonry support and of the FRCM strengthening. The accuracy of the proposed procedure is assessed by comparison between the experimental results of 49 FRCM out-of-plane strengthened masonry walls collected from the literature and the corresponding analytical provisions. In addition, the experimental database collected is employed to assess the accuracy of the analytical approach provided by the ACI 549.4R-13
Nuove strategie per la prevenzione del tumore della cervice uterina: un'analisi costo-efficacia
No full textRapporti Istisan, 10(25
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