1,720,985 research outputs found
Applicazioni industriali della tecnologia SFRC per la realizzazione di strutture prefabbricate
No full text
Design criteria for structural use of fibre-reinforced concrete in prestressed precast roof elements
No full textPrefabricated roof elements: knowledge and experience accumulated in over twenty years
No full textRoof elements are a highly technological prefabricated product of Italian industry. Though a large variety of shapes are offered on the market, almost all production is characterized by thin-webbed open cross-section profiles. In the last twenty years, both the design and the technological aspects have evolved the production of these structural elements. A wide experimental experience on their structural behaviour has highlighted the effectiveness of beam theory in the prediction of serviceability and ultimate limit states, but also a significant interaction between the longitudinal and the transversal bending at failure. The interaction is due to second order effects, and becomes not negligible when the longitudinal bending curvature approaches the onset of yielding in the pre-stressed reinforcement. Owing to the open cross-section and to the reduced thickness of the inclined wings, a shape loss can anticipate the longitudinal bending collapse. A simple design model is proposed to predict this collapse. An extensive experimental investigation was also carried out on the use of Steel Fibre Reinforced Concrete to substitute the diffused reinforcement in prefabricated long-span covering roof elements. In the paper the mechanical behaviour up to failure of a traditional R/C element with that of SFRC elements with reference to a shed shape are discussed. The SFRC elements are characterized by two types of fibre and two concrete matrix strengths
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
- …
