102,522 research outputs found
Shear strengthening of wall panels through jacketing with cement mortar reinforced by GFRP grids
No full textThis paper gives the results of a series of shear tests carried out on historic wall panels reinforced with an innovative technique by means of jacketing with GFRP (Glass Fiber Reinforced Plastics) mesh inserted into an inorganic matrix. Tests were carried out in situ on panels cut from three different historic buildings in Italy: two in double-leaf rough hewn rubble stone masonry in Umbria and L'Aquila and another with solid brick masonry in Emilia. Two widely-known test methods: the diagonal compression test and the shear-compression test with existing confinement stress. The test results enabled the determination of the shear strength of the masonry before and after the application of the reinforcement. The panels strengthened with the GFRP exhibited a significant improvement in lateral load-carrying capacity of up to 1060% when compared to the control panels. A numerical study assessed the global behavior and the stress evolution in the unreinforced and strengthened panels using a finite element code
Rime di G. ACciano; Rime di A. Muscettola e I Sonetti di B. Pisani, a cura di Luigi Montella
No full textCastori Et Poluci : Gemino Principum Sideri Pari Fratrum Sine Pari ... Dn. Christiano Alberto, Dn. Augusto Friderico, Haeredibus Norwegiae, Ducibus Holsatiae Et Sleswigae, Stormariae Dithmarsiae ... Humillime Extemporali Epigrammate Gratulatur / D. G. Morhofius
No full textSchöpf-Schulz-Passarge syndrome: Further delineation of the phenotype and genetic considerations
No full textSchöpf-Schulz-Passarge syndrome is a rare ectodermal dysplasia, characterized chiefly by multiple eyelid apocrine hidrocystomas, palmo-plantar keratoderma, hypodontia, hypotrichosis and nail dystrophy. The clinical spectrum and the most likely inheritance pattern(s) have not yet been completely defined. We report here on two, unrelated patients presenting with additional, previously unreported features, including hypoplastic nipples and optic atrophy. Both individuals were born to consanguineous parents, and one also has affected siblings. A literature review identified 23 additional cases. Multiple eyelid apocrine hidrocystomas, described in all of the cases, are the hallmark of this condition, although they usually appear in adulthood. The concomitant presence of eccrine syringofibroadenoma in most patients and of other adnexal skin tumours in 44% of affected subjects indicates that Schöpf-Schulz-Passarge is a genodermatosis with skin appendage neoplasms. However, the risk of skin and visceral malignancies is not increased. Pedigree study demonstrates that 9 of the 13 published familial cases may be explained by an autosomal recessive mutation, while the remaining pedigrees show apparent vertical transmission compatible with genetic heterogeneity. The benign disease course and advanced age at diagnosis could also suggest locus homogeneity for a recessive mutation with instances of pseudodominant inheritance
Strengthening of historic masonry walls using GFRP grids embedded into inorganic matrices
No full textThe paper presents a compilation of some of the author's research results related to the use of composite grids as shear strengthening materials historic masonry members. Glass Fiber Reinforced Polymer (GFRP) grids was used to strengthen unreinforced barely-cut stone masonry and clay brick walls. Unreinforced Masonry building (URM) panels were evaluated in-site under lateral loading. Various GFRP configurations were used to repair or retrofit undamaged masonry wall panels. The URM panels were loaded to ultimate condition under two test methods: in-plane diagonal compressive force (diagonal compression test) and in plane horizontal lateral force (shear-compression test). Tests were carried out in situ on panels cut from three different historic buildings in Italy: two in double-leaf rough hewn rubble stone masonry in Umbria and L’Aquila and another with solid brick masonry in Emilia. Test results indicate that application of GFRP grid embedded into an inorganic matrix (hydraulic based mortar) is an effective retrofit scheme for the wall panels, becausethe in-plane capacity of the strengthened walls increased significantly both for undamaged and repaired panels
Masonry wall panels with GFRP and steel-cord strengthening subjected to cyclic shear: An experimental study
No full textThis paper provides the results of a series of shear tests carried out on wall panels reinforced with two techniques by means of jacketing with GFRP (Glass Fiber Reinforced Polymers) mesh inserted inside an inorganic matrix and a reinforced repointing of mortar joints using high strength stainless steel cords. The tests were done on panels assembled in the laboratory and were carried out using a widely-known test method (diagonal compression test). Masonry materials include stone and brick in which a variety of unit sizes and forms are produced. Mortar was a hydraulic lime/sand with a plasticiser added to improve workability. The failure loads, in-plane and out-of-plane deflections and failure modes were recorded. Based on the results of the experimental program, it appears that the in-plane shear strength of the reinforced masonry wall systems increased significantly compared with that of control unreinforced masonry panels
The Reticulatus method for shear strengthening of fair-faced masonry
No full textThis paper presents the results of several experimental campaigns recently carried out by the authors and devoted to the investigation of the mechanical performance of wall panels strengthened by applying repointing mortar and high strength stainless steel or composite cords. The reinforcement system, known as Reticulatus, allows the reinforcement of regular and irregular-shape masonry walls, when the fair-faced aspect must be kept. In the perspective of using this reinforcement method, this article summarizes the research that has been done so far, presenting new original test results and discussing the design procedures. Twenty-two square wall panels were loaded in their plane by means of a single point load acting through the panel’s diagonal. Experimental results are presented for four types of cord reinforcement using matched samples, reinforced and not. Increases in shear strength from 15 to 170 % were achieved for the strengthened panels. Each wall panel was loaded well into the lateral post-elastic regime and then unloaded. Experimental results were in good agreement with predictions from simple models which assume the wall panels to behave like a plate, neglecting the contribution of the repointing mortar, and accounting for the non-linear behavior of the masonry
Reinforcement of masonry panels with GFRP grids
No full textThis paper reports and analyses the results of a series of mechanical tests carried out on historic walls reinforced with an innovative technique by means of jacketing with GFRP (Glass Fiber Reinforced Plastics) grid inserted into an inorganic matrix made of cement based mortar in order to increase the lateral load-carrying and deformation capacity of unreinforced masonry (URM) walls. The basic construction material of analysed historic buildings are masonry assemblage of barely cut stones of different size and brickwork cemented by weak lime/sand mortar. This heterogeneous masonry typologies constitute a kind of low-strength masonry especially to horizontal seismic actions. Shear tests were carried out in-situ on panels cut from two different historic buildings in Italy: one in double-leaf rough hewn rubble stone masonry in Umbria and the second in the city of L'Aquila. Two widely-known test methods have been used for the experimental work: the diagonal tension test and the shear-compression test. The test results enabled the determination of the shear strength and shear modulus of the masonry wall panels before and after the application of the reinforcement. The panels strengthened with the GFRP exhibited a significant improvement in lateral load-carrying capacity of up to 1060% when compared to the control unreinforced panels
Gastrointestinal and nutritional issues in joint hypermobility syndrome/ehlers-danlos syndrome, hypermobility type.
No full textGastrointestinal involvement is a well known complication of Ehlers-Danlos syndromes (EDSs), mainly in form of abdominal emergencies due to intestinal/abdominal vessels rupture in vascular EDS. In the last decade, a growing number of works investigated the relationship between a wide spectrum of chronic gastrointestinal complaints and various EDS forms, among which the hypermobility type (a.k.a. joint hypermobility syndrome; JHS/EDS-HT) was the most studied. The emerging findings depict a major role for gastrointestinal involvement in the health status and, consequently, management of JHS/EDS-HT patients. Nevertheless, fragmentation of knowledge limits its impact on practice within the boundaries of highly specialized clinics. In this paper, literature review on gastrointestinal manifestations in JHS/EDS-HT was carried out and identified papers categorized as (i) case-control/cohort studies associating (apparently non-syndromic) joint hypermobility and gastrointestinal involvement, (ii) case-control/cohort studies associating JHS/EDS-HT and gastrointestinal involvement, (iii) case reports/series on various gastrointestinal complications in (presumed) JHS/EDS-HT, and (iv) studies reporting gastrointestinal features in heterogeneous EDS patients' cohorts. Gastrointestinal manifestations of JHS/EDS-HT were organized and discussed in two categories, including structural anomalies (i.e., abdominal/diaphragmatic hernias, internal organ/pelvic prolapses, intestinal intussusceptions) and functional features (i.e., dysphagia, gastro-esophageal reflux, dyspepsia, recurrent abdominal pain, constipation/diarrhea), with emphasis on practice and future implications. In the second part of this paper, a summary of possible nutritional interventions in JHS/EDS-HT was presented. Supplementation strategies were borrowed from data available for general population with minor modifications in the light of recent discoveries in the pathogenesis of selected JHS/EDS-HT features
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