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Design and construction of two integral bridges for the runway of Milan Malpensa Airport
No full textIn this study, two bridges recently completed at the Malpensa Airport are presented. The bridges overpass the trench where the railway track from Malpensa Airport runs to the city of Milan. They are part of a U-shaped path, called the hotel (H) ring, which connects the southern ends of the two existing taxiways. Such a crossing had to: (a) intersect the railway track twice with a high skew angle, (b) carry the maximum aeronautical loads, corresponding to the gears of an AIRBUS 380 aircraft and (c) host a 60-m wide taxiway strip, plus a lateral safety lane and a service road, for a total width of 96 m. For a bridge operating in such an environment, it was imperative to reduce inspections and maintenance activities to a minimum. Therefore, the designers excluded any detail arrangements or auxiliary devices having life-cycle performances much shorter than that of the main structure. In particular, expansion joints and movable or deformable bearing supports were excluded. Such constraints led to design two structures having the peculiar features that characterise them as integral bridges. This paper will firstly recall the aeronautical and railway specifications and the other operating constraints that characterised the design. In the second part, the criteria followed in designing the foundations, the abutments and the deck are presented. The structural analyses were set out in accordance to the sequence of the construction stages. For the bridge in its service configuration, self-weight and permanent loads give rise to a set of internal forces typical of a portal frame, while the localised loads, due to the aircraft gears, induce bubble deformed shapes characterised by particular transversal load distribution mechanisms. Details of completions and finishing works are finally given
TWIN RUNWAY INTEGRAL BRIDGES AT MILANO MALPENSA AIRPORT, ITALY
No full textTwo recently completed
bridges at the Malpensa Airport are presented.
The bridges overpass
the railway (which runs in a cutting,
at a lower level) linking the Malpensa
Airport to the city of Milan, Italy; and
are part of a U-shaped path called the
H (Hotel) Ring which connects the
southern ends of the two existing taxiways.
Such a crossing had to: (a) intersect
the railway track twice with a skew
angle of about 45°; (b) carry the maximum
aeronautical loads, corresponding
to the gears of an Airbus 380 aircraft
and; (c) host a 60 m wide taxiway strip,
plus a lateral safety lane and a service
road, for a total width of 105 m. This
paper briefly describes how the above
requirements were dealt with while
designing two integral bridges
A Large Span Roof made of Cable Stayed Arches
No full textA large span roof made of cable stayed arches is presented. If compared to a traditional
tied arch, the pre-tensioned cable stayed arch presents: (a) a strong reduction of the bending
moments; (b) a general increase of the stiffness; (c) a strong increase of the limit multiplier
associated with the Eulerian critical load
A large span roof made of cable stayed arches
No full text<p>A large span roof made of cable stayed arches is presented. If compared to a traditional tied arch, the pre-tensioned cable stayed arch presents: (a) a strong reduction of the bending moments; (b) a general increase of the stiffness; (c) a strong increase of the limit multiplier associated with the eulerian critical load.</p></jats:p
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe 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
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