1,721,143 research outputs found
Correction to: Biaxial bending of SFRC slabs: Is conventional reinforcement necessary? (Materials and Structures, (2019), 52, 1, (1), 10.1617/s11527-018-1302-0)
No full textThe article ‘‘Biaxial bending of SFRC slabs: Is conventional reinforcement necessary?’’, written by Marco di Prisco, Matteo Colombo and Ali Pourzarabi, was originally published electronically on the publisher’s Internet portal (currently SpringerLink) on 22 December 2018 without open access. The copyright of the article changed in December 2019 to The Author(s) 2019, and the article is forthwith distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits use, duplication, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license and indicate if changes were made. Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http:// creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made
Critical infrastructures in Italy: State of the art, case studies, rational approaches to select the intervention priorities
Full text linkThe collapse risk is a factor associated to the construction of any structure or infrastructure: maintenance and monitoring are actions aimed at reducing this risk, but they cannot reduce it to zero. The lack of a plan of maintenance procedures, established by the designer at the construction time, jointed to the neglecting of robustness principle in the conceptual design as well as of some possible extreme events correlated to the infrastructure far-field are the main causes of the collapses observed. The lack of a generalized consent of the technical and scientific community on the procedures to be pursued at the end of the expected life contribute also to increase the scattering of safety conditions in many infrastructures used in the road traffic. After a generalized discussion on the main causes of collapse, a specific analysis on Italian infrastructure situation aimed at highlighting the significant difference between the railway infrastructures from the road ones is proposed. An analysis of few collapse case studies like that one of Annone overpass, or that one on SP10 crossing the highway A14 near Ancona, as well as a discussion on the uncertainties in the diagnosis of historical bridges like Azzone bridge or on the critical aspects met in the design of intervention on relatively old bridges made of steel or post-tensioned reinforced concrete will be instrumental at giving a faceted overview of this complex problem that the next Model Code will try to deal with an organic vision. Finally, a brief nod on the main activities in progress to overcome this critical situation at both national and regional levels is outlined
L'eredità dei corpi esclusi: indagine sugli spazi eteropici della devianza
No full textThe history of deviance has left a heritage of "arcitectural devices" conceived and designed to exclude and isolate. On the one hand, asylum places seek a new identity without giving up memory; on the other hand, prisons that currentlu, by their constitution, do not meet the principles of rehabilitation of the condemned because they were created to punish.
The survey aims to investingate the almost antithetical history of thse two places through case studies and new possible visions
Thin-webbed open cross-section roof elements: modelling of second order effects up to failure.
No full text
Safety assessment of a CFRP retrofitted bridge
No full textThe maintenance of existing bridges sometimes requires an intervention to increase their residual bearing capacity during their service life. The bridge strengthening can modify significantly the original structural behaviour, but, in many cases, the lack of a specialized standard for existing structures in the past prevented the designer to operate a suitable check of the updated performance. In the paper, an example of a three-span overpass, built in the sixties in Lombardia, is investigated. Around ten years ago a significant restoration was carried out due to the bad conditions of the infrastructure: the P/C beams were retrofitted by means of CFRP strips and the top slab over the two internal piers was also strengthened by additional reinforcement. After a basic diagnostic aimed at verifying the mechanical characteristics declared in the documentation attached to the drawings and the pictures of the retrofitting intervention, a load test driven by a preventive structural analysis carried out by means of a linear elastic approach allowed to fix a control procedure aimed at guaranteeing the safety conditions in the future time. The discussion on the adopted procedure is the main goal of the paper
Applicazioni industriali della tecnologia SFRC per la realizzazione di strutture prefabbricate
No full textA new approach to improve safe exceptional transportation: a Proof of Concept in the framework of NRRP
No full textNortheastern region of Italy is crossed by more than 54,000 annual exceptional transports. The secure transportation of these loads faces challenges due to road infrastructure constraints. Nowadays the movement of exceptional vehicles requires mandatory special permits granted by numerous road authorities, before embarking on a journey. This paper describes a transport corridor connecting the Swiss border with Maghera harbour passing through Milano analysed as a Proof of Concept (POC) in the framework of NRRP, providing a preliminary analysis of all the bridges identified along the path. The collected data encompass the parameters necessary for completing Level 0 criteria outlined in the Italian Guidelines for risk classification and bridge management, including security assessment and monitoring. Finally, 10 bridges are selected with the aim of developing experimental and simplified methodology for evaluating safety coefficients, focusing on the safe passage of Heavy Good Vehicles (HGVs)
- …
