1,720,963 research outputs found
Structural defects for condition assessment of existing bridges: some results of a territorial case study
No full textRecent events involving the tragic collapse of existing bridges have led to an increasingly detailed study of infrastructure and its maintenance. Italy's intricate road system has a large number of existing bridges demanding urgent and costly maintenance interventions. This study presents a critical review of several defects inspected on existing bridges located in the Basilicata region. The work is addressed at describing the defects surveyed, and at critical evaluating the main causes also due to the interaction with the environmental context surrounding each bridge analysed. Moreover, the paper discusses on how the detailed context knowledge can help to properly identify the correct maintenance intervention on existing bridges
Structural defects for condition assessment of existing bridges: some results of a territorial case study.
Full text linkRecent events involving the tragic collapse of existing bridges have led to an increasingly detailed study of infrastructure and its maintenance. Italy's intricate road system has a large number of existing bridges demanding urgent and costly maintenance interventions. This study presents a critical review of several defects inspected on existing bridges located in the Basilicata region. The work is addressed at describing the defects surveyed, and at critical evaluating the main causes also due to the interaction with the environmental context surrounding each bridge analysed. Moreover, the paper discusses on how the detailed context knowledge can help to properly identify the correct maintenance intervention on existing bridges
A preliminary investigation on material properties of existing prestressed concrete beams.
Full text linkThis paper reports some preliminary results of an ongoing research activity addressed to collect and to elaborate the main mechanical properties of materials of pre- and post-tensioned concrete girder bridges. In particular, in this work data samples is obtained by analyzing design documents of a stock of existing bridges realized in Basilicata (south of Italy). At first, the paper presents a proposal on how information available is collected. Then, results of the statistical elaborations on the samples gathered are shown, in order to provide useful support in estimating the mechanical properties of the materials used in the bridges typologies considered in this study
Half-joints degradation: analysis of some case studies.
Full text linkExisting Reinforced Concrete (RC) bridges, due to their age, are very often affected by significant deterioration phenomena, also intensified by lack of maintenance, which strongly reduces their strength with respect to the design load combinations.
In particular, half-joints were widely used in the RC bridge typology until the end of the 20th century. As well known, due to the static scheme adopted, and recurrent failure due to fragile mechanisms, to date these elements are recognized as critical, since their strength is particularly affected by degradation frequently provoked by erosion caused by rainwater infiltration from the roadway. This phenomenon, definitively, leads to a marked concrete cover reduction and corrosion of the reinforcing bars.
This paper deals with the analysis of certain types of half-joints employed in existing reinforced concrete bridges. To this scope, some case studies are illustrated and discussed to highlight weakness points of the typologies analyzed and causes of defects observed
Interventions for out-of-plane failure mechanisms prevention of existing masonry buildings
No full textHalf-joints degradation: analysis of some case studies
No full textExisting Reinforced Concrete (RC) bridges, due to their age, are very often affected by significant deterioration phenomena, also intensified by lack of maintenance, which strongly reduces their strength with respect to the design load combinations. In particular, half-joints were widely used in the RC bridge typology until the end of the 20th century. As well known, due to the static scheme adopted, and recurrent failure due to fragile mechanisms, to date these elements are recognized as critical, since their strength is particularly affected by degradation frequently provoked by erosion caused by rainwater infiltration from the roadway. This phenomenon, definitively, leads to a marked concrete cover reduction and corrosion of the reinforcing bars. This paper deals with the analysis of certain types of half-joints employed in existing reinforced concrete bridges. To this scope, some case studies are illustrated and discussed to highlight weakness points of the typologies analyzed and causes of defects observed
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
Variations on the Author
Full text link“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
- …
