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Conceptual approach to the structural design of graduate theses in the Faculty of Architecture
No full textFatigue strength of welded joints: a synthesis based on generalised stress intensity factors and local strain energy
No full textFatigue Strength of Welded Joints: a Synthesis based on Generalised Stress Intensity Factor and Local Strain Energy
No full textFatigue behaviour of bonded anchors subjected to tensile loads
No full textFollowing recent studies on the fatigue behaviour of noise barriers for high speed railways for train transits, threaded rods bonded with epoxy resin for column base plate anchorage had to be qualified. A fatigue test campaign was carried out at Fischer Laboratories in Denzlingen (Germany) on M20 and M30 (8.8 Grade) threaded rod samples embedded in concrete by means of FIS EM epoxy resin. The tests considered also threaded rods (M16 and M30, 8.8 Grade) not directly embedded in concrete, but in pre-cast corrugated pipes having a diameter constant and equal to 40 mm.
The results were found to be very satisfactory as far as the resin performance was concerned. In fact, under tensile loads carried out under a nominal load ratio R 0, all fatigue failures took place in the threaded rods, under the nut, notwithstanding the embedment length was that suggested by technical manuals for static loading. Some typical fracture surfaces relating to medium and high cycle fatigue regime are documented.
A statistical re-analysis has been carried out considering also other data, either obtained at Fischer laboratories from analogous threaded applications or taken from the literature. A new scatterband is provided for threaded rods with diameter equal to or less than 20 mm
Notch stress intensity factors and fatigue behaviour of steel and aluminium welded joints
No full textWeld bead geometry cannot, by its very nature, be precisely defined. Parameters such as bead
shape and toe radius vary from joint to joint even in well-controlled manufacturing operations.
In the Notch Stress Intensity Factor (N-SIF) approach the weld toe region is modelled as a sharp
V-shaped corner and local stress distributions in planar problems can be expressed in closed
form on the basis of the relevant Mode I and Mode II N-SIFs. Initially thought of as parameters
suitable for quantifying only the crack initiation life, N-SIFs are shown able to predict also the
total fatigue life, at least when a large part of the life is spent as in the propagation of small
cracks in the highly stressed region close to the notch tip. A large amount of experimental data
reported in the literature for steel and aluminium welded joints is used here to demonstrate the
applicability of the N-SIF-based approach
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
Influence of hot-dip galvanization on the fatigue performance of high-strength bolted connections
No full textIn the present work, the influence of hot-dip galvanization (HDG) on the fatigue behaviour of high-strength bolted details is investigated through a set of 15 constant-amplitude tests. Cyclic behaviour of coated specimens is hence compared against results for unprotected samples drawn from literature, i.e., both with reference to neutral and aggressive exposure conditions. Namely, while behaviour of coated samples is moderately inferior as respect to uncoated ones in dry air (–6 % in terms of characteristic fatigue strength, probability of failure PF = 5 %, confidence interval CI = 75 %), their performance still complies with European normative requirements for double covered joints, and galvanization proves to be highly effective when corrosion is likely to occur (with a characteristic strength increase of [+12 %; +52 %]). Finally, fractography analyses on both uncoated and coated specimens were performed, suggesting that hydrogen embrittlement may play a role in reducing fatigue strength of coated joints, that is, especially within the high-cycle fatigue regime
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
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