1,720,978 research outputs found
WALL BASE STRUCTURE FOR LIGHT BUILDINGS
No full textThe present invention relates to a base that is couplable to a building wall to connect said wall to a reinforced concrete foundation. The invention also relates to a building wall comprising said base and a building construction method comprising said wall. The present
invention is particularly, albeit not exclusively, suitable for application to the construction of buildings having a light structure, for example comprising wooden or steel or aluminium walls
Nuova tecnologia per la riduzione del rischio sismico: le pareti in CLT post tese a basso danneggiamento
No full textL’articolo descrive i principali risultati ottenuti nell’ambito del progetto di ricerca TIRISICO
“Tecnologie innovative per la riduzione del rischio sismico delle costruzioni” finanziato dalla regione
Emilia Romagna (POR-FESR 2017-2019). In particolare l’articolo riporta la descrizione e la
caratterizzazione sperimentale di un sistema costruttivo innovativo del tipo a pareti CLT (Cross
Laminated Timber – pannelli X-LAM) post-tese assemblate con dispositivi isteretici esterni e
sostituibili a valle di un evento sismico
Earthquake-resistant CLT buildings stiffened with vertical steel ties
No full textThe interest in multi-storey CLT buildings in seismic areas is leading to the development of new strategies to increase the lateral stiffness of shear walls and to resist high tensile forces due to rocking. Both these purposes can be achieved with vertical steel ties placed at each shear-wall end, to directly transfer tensile forces from each storey to the foundation. Three technologies are proposed for transferring forces from CLT panels to the ties: the use of nailed plates, of screwed connectors, or directly by contact with a thick plate at the top of each storey wall. The dynamic behaviour of CLT shear walls, representing the bracing system of a building and anchored with the aforementioned technologies, has been investigated by means of dynamic analyses and a comparison with the use of common nailed plates or screwed connections without ties. Results, varying the number of storeys and the seismic mass, show that the proposed technology is an effective strategy to increase the feasibility of multi-storey CLT buildings. Complementary non-linear static analyses have been performed to evaluate the actual displacement capacity and ductility of the systems
A sustainable RC-framed skin for integrated seismic retrofit intervention on existing buildings: experimental and numerical characterization
No full textThis paper presents an innovative RC-framed skin for integrated and sustainable retrofit intervention of existing build-ings. A detailed description of the proposed skin technology is provided, focusing on the integrated improvement of structural (e.g. seismic) and non-structural (e.g. energy) performances as well as on the issues concerning the limitation of invasiveness and inter-ruption of use of the building. Some numerical analyses were carried out to design the experimental tests on the proposed RC-framed skin system by means of an advanced FE model implemented within the OpenSees framework. Modelling criteria, assumptions and the principal numerical results in terms of global response are presented and discussed. Experimental tests carried out on a full scale selected configuration of the proposed RC-framed skin are presented in terms of test setup, samples characteristics, cyclic loading protocol and some preliminary results are critically discussed
Determination of the fundamental period of CLT buildings via incremental elastic-non linear dynamic analyses
No full textThe evaluation of the proper period of vibration is one of the crucial issues in the analysis and seismic design of
buildings and is influenced by a number of variables contributing in the definition of the global rigidity and
therefore the seismic susceptibility of the structure. In the case of multi-storey X-Lam buildings connection
elements play a key role since they are responsible of most of the dissipative and deformative capacity of the
structure. The present work aims to investigate the influence of the connection elements typically used to avoid
the rocking of the seismic-resistant walls (i.e. hold-down elements) on the fundamental period of multi-storey XLam
buildings. A nonlinear numerical model capable of faithfully reproducing the rocking behavior of X-Lam
wall system (i.e. accounting for the interaction between the vertical applied loads and the hold-down connection
activation) is developed and validated on experimental dynamic tests. The model is used to assess the principal
vibration period of a selected case study by means of incremental dynamic analyses. Results from the experimental
tests and from the performed analyses demonstrate that when the X-Lam wall system is subjected to significant
vertical loads (capable of avoiding the overturning of the walls) the principal vibration period is not affected by
the connection stiffness. On the contrary, when negligible vertical loads are applied to the X-Lam wall the principal
vibration period is controlled by the hold-down connection stiffness. Finally, the numerical model is also used to
characterize the principal vibration period of the case study at different level of the top-displacement adopting
seismic input with variable frequency. Results from numerical analyses confirm the strong correlation between
the value of principal vibration period and the phenomenon of hold-down connection activation showing an
increase of the period increasing the top building displacement
In-plane strengthening of masonry buildings with timber panels
No full textThe in-plane strengthening of masonry walls plays a key role in the improvement of the global seismic behaviour
of masonry buildings. Various strengthening techniques are currently available, such as coatings, confinement or
injection and the use of cement-based materials or steel- or fibre-reinforced polymers or mortars. In this work, two
innovative strengthening techniques for existing masonry buildings were investigated: the use of glued or nailed
timber wall panels connected to the outer and/or inner face of the masonry wall. Their effectiveness in reducing
the seismic vulnerability of existing masonry walls was assessed in tests and numerical simulations. The test results
demonstrated improvements in strength, rocking displacement capacity and energy dissipation capacity. The
numerical analyses, conducted with non-linear models calibrated on experimental results available in the literature,
confirmed the advantages of these interventions, comparing the effects of using monolithic or coupled glued or
nailed wall panels, provided that particular attention is given to their connection to the existing structure
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
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe 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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