1,720,992 research outputs found
Chemical Demolition of Unit Masonry: A Preparatory Study
Full text link10th International Conference on Structural Analysis of Historical Constructions: Anamnesis, Diagnosis, Therapy, Controls (SAHC2016), Leuven, Belgium, 13-15 September 2016Chemical demolition of concrete and rock has been conducted on a commercial basis since the 1970s, although not widely adopted. Furthermore, to date there have been no publications on the application of this class of products to unit masonry. To begin to fill this gap, this paper documents a laboratory study on the insertion of a soundless chemical demolition agent into a series of unit masonry wallettes. The paper introduces initial steps towards developing a procedure for the non-percussive demolition of such a wall and observations on the progressive nature of cracking in such arrangements. Although neither the assembled units nor the mortar in these tests were of historic material, the paper provides critical insight into the application of this technology into a building configuration in which it is not usually seen. The results show the promise this technology holds for highly selective material removal, without endangering the surrounding material for historic brick and stone buildings.Science Foundation IrelandCheck for published version. Applied for permission to Taylor and Francis 27/09/2016 MEL 27/09/2016. Contact publisher after 18 months. JG 2016-10-212017-11-27 JG: Requesting permission early at author's reques
Condition assessment and monitoring in Milan Cathedral: putting risk assessment into practice
No full textThe cathedral of Milan required continuous care during the long realization works, since 1386, its foundation, to 1964, officially indicated as the end of the construction. The Veneranda Fabbrica del Duomo, the body managing the construction and the conservation of the Cathedral in the course of time, developed a series of technical competencies and procedures for this purpose. These good practices are also supported by the Politecnico di Milano. Among the various activities carried out by Politecnico di Milano for sustaining the Veneranda Fabbrica in its mission, the risk analysis related to the rich decorative sculptures became a new point demanding the setting of a proper evaluation methodology. By analyzing different approaches among risk and condition assessment, the authors present a study of a new procedure for detecting risk conditions through a set of indicators. The aim of this procedure is to define an index connected to the frequency of the inspection activities necessary for guaranteeing safety aspects concerning the building and the people attending its spaces
Quale futuro per i beni architettonici del XX secolo?
No full textComitato scientifico internazionale composto da: Jacques Akerboom, Alberto Artioli, Andrea Canziani, Maristella Casciato, Stefano Della Torre, Antonio Ferro, Pietro Petraroia, Jan Rosvall, Anouk Stoulens, Koen Van Balen, Luc Verpoes
M & L Jaargang 5/4
Full text linkGeneriekArmand Vermeulen - Woord voorafMadeleine Manderyck Enkele historische aspecten omtrent het Lam Godsretabel in de Sint-Baafskathedraal in Gent. Opstelling en beveiliging in het verleden. [Origination of the Mystique Lamb and the concern in the past for its preservation.]Eindelijk is het dan zover. In de doopkapel van de Gentse Sint-Baafskathedraal staat Van Eycks Lam Gods beveiligd en wel opgesteld. Redenen te over dan ook om deze brandend actuele ingreep een M&L-aflevering lang in een juister daglicht te stellen. Hoe het veelluik tegen beter weten in tot op heden behouden bleef, wordt alvast sober samengevat door Madeleine Manderyck.Edgard Goedleven De prijs van de veiligheid: 8 jaar palaver, 5 maand werk. [The price for security: 8 years of palaver, 5 months of work.]Eens de sponsering van de beveiligingswerken verworven, werd Edgard Goedleven door Gemeenschapsminister Karel Poma persoonlijk opgedragen te waken over de vlotte realisatie van het project. Wie is dan ook beter geplaatst om het lijvige dossier van de totstandkoming chronologisch onder de loupe te nemen? Een intrigerende lijdensweg.Liliane Masschelein-Kleiner De verplaatsing van het Lam Gods. [The replacement of the Mystique Lamb.]Kunst in nood laat het Koninklijk Instituut voor het Kunstpatrimonium niet onbewogen. Deze wereldwijd befaamde instelling kreeg dan ook haast vanzelfsprekend de delicate verhuizing van de panelen toevertrouwd. Het werkverslag van Liliane Masschelein-Kleiner.Jan Lodewijk Cnops De beveiliging van het Lam Gods. [The protection of the Mystique Lamb.]Specifieke - ja zelfs hypothetische - bedreigingen beantwoordt het menselijk vernuft met concrete maatregelen. Van Jan Lodewijk Cnops vernemen we in detail hoe nu de beveiliging van het retabel is opgevat - uiteraard op een paar geheimgehouden verrassingen na.Alfons L. Dierick Van Eyck- Botanicus. [Van Eyck as a botanist.]Zoals Alfons L. Dierick - door het oog van de camera - de grasvelden van het Lam Godsretabel heeft verkend, moet Van Eyck het ooit hebben gedroomd. Een onderonsje van kunstenaars, waarbij woorden eigenlijk overbodig zijn.Eddy De Witte, Koen Van Balen en Rob Buelens De beveiliging van kerken en hun kunstbezit. [Protection of art heritage in churches.] Agressie van licht en klimaat, brand, diefstal, vandalisme, zorgwekkende escalaties van geweld... Een koele diagnose van deze verschijnsels door Eddy De Witte, Koen Van Balen en Rob Buelens, en mogelijke therapieën.SummaryM&L Binnenkran
M & L Jaargang 5/2
Full text linkGeneriekAdolf De Ceuleneer en Madeleine Manderyck De conservatie van het grafmonument van Anselm Adornes en Margaretha Vander Banck in de Jeruzalemkerk te Brugge. [The conservation of the sepulchral monument of Anselm Adornes and Margaretha Vander Banck in Jerusalem church at Bruges.]Gisanten uit steen gesneden met de eeuwigheid voor ogen ... tot ook zij door onooglijke zoutkristallen tot stof worden verteerd: in een poging tot bestendiging sloegen exacte wetenschap en kunstgeschiedenis over het 15de-eeuws grafmonument van Anselm Adornes de handen in elkaar. Adolf De Ceuleneer en Madeleine Manderyck verhalen het hoe en het waarom van de reddingsoperatie.Johan Grootaers De restauratie van Het Vliegend Peert (1772-1773) in Mechelen. [The restoration of Het Vliegend Peert in Mechelen.]In Mechelen staat een huis ... . Ooit de woning van Bruegels\u27 schoonmoeder, in de latere 18de eeuw ingrijpend voorzien van een rocaille-gevel en pas een vijftig jaar geleden gedeeltelijk verminkt.Aansluitend op het nauwkeurig onderzoek door Johan Grootaers werd bij de recente face-lift bijzondere aandacht besteed aan het kleurgebruik.Koen Van Balen Stabiliteitsherstel in monumentenzorg. [Structural consolidation in monument conservation.]Vaker dan lief is blijkt bij werken aan een monument de stabiliteit van het gebouw ondermijnd. Voor Koen Van Balen is een degelijk vooronderzoek ter zake nauwelijks een overbodige luxe. Een analytische introductie tot de vijfdaagse Internationale bijscholingscursus over structureel herstel van historisch waardevolle gebouwen, Leuven 19-24 mei 1986.K.A.H.W. Leenders Nieuwmoer. [Nieuwmoer.]Voor zijn gelijknamige studie van verdwenen venen in het gebied tussen Antwerpen, Turnhout, Geertruidenberg en Willemstad werd K.A.H.W. Leenders bedacht met de Geschiedenisprijs 1985 van het Gemeentekrediet van België.De organische verbondenheid van Nieuwmoer met de veenuitbating vormt hiervan een boeiend deelfacet.Marc De Borger Relicten en structuren in het landschap rond Nieuwmoer. [Landscape relics and structures in and around Nieuwmoer: reminescenses of the peat exploitation.]Eens de historische ontwikkeling van het landschap op en om Nieuwmoer getekend, begeeft Marc De Borger zich op het pad van de landschapsarcheologie. Meteen een pleidooi voor het behoud van deze kenmerkende en waardevolle visuele getuigen.SummaryM&L Binnenkran
San Giovanni Battista church: Operational modal analysis after injected anchors strengthening
No full textThe paper reports the results of the efficacy of a strengthening intervention on the Church "San Giovanni Battista" in Sottochiesa (BG-Italy) by tying the entire building through injected anchors equipped with a special fabric sleeve to guarantee effective and controlled grout injections. The Church presented a relevant crack pattern especially on the apse masonry dome. Anchors placed along the perimeter walls through-thickness (27 m) and along the façade and the apsewalls (10-12 m)were pre-stressed and injected.The retrofit measurewas necessary to counteract wall instability, to contain the existing crack pattern, in order to prevent their widening, and to obtain a general improvement of the stability of the archivaulted walls. Preliminary in-situ tests, such as pull-out tests on sample (sacrificial) anchors installed in masonry, were performed before designing the retrofit intervention. The effectiveness of the intervention was evaluated by comparing the results of ambient modal characterization of the building before and after the retrofit works. Since the final aim was to provide new continuity to the walls, reducing and controlling the main vulnerability in the building without significantly altering the behavior of the church, the experimental results have confirmed the efficacy of the intervention, showing unchanged modal shapes and a slight stiffness increase of the entire building. The study gave also the opportunity of testing and evaluating the possibility of making long diamond core drilling works along the perimeter walls in order to tie large buildings through injected anchors equipped with fabric sleeve
The Augustan Bridge at Narni: From laser survey to FEM seismic analysis
No full textThe Augustan Bridge of Narni represents one of the greatest transit infrastructure realized by the Romans. Mentioned in classical sources, partly collapsed on several occasions, the bridge has kept his strategic military role until the definitive collapse in 1053, being the obligatory transit from Rome to the North. Although subject to many studies however many technical aspects of the structure are still not fully understood: from which quarry the travertine blocks came from, the original number of arches, the absence of breakwater, the shape of the collapsed arches, its slope and physical connection to the Via Flaminia at both mountain and valley level, as well as the causes of its collapse. Recently an entire laser survey was carried out, today updated, providing comprehensive measurements for reconstructing the bridge’s original shape and overall size. Finally from FEM models was carried out a series of structural analysis
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
Strengthening of masonry vaults through a thin extradoxal layer of fiber reinforced lime mortar
No full textA technique to strengthen existing masonry vaults consisting in the application at the extrados of a GFRP mesh reinforced mortar coating is herein presented.The effectiveness of the technique is investigated through non-linearstaticanalysisutilizinga2Dsmearcrackmodel.Solidbrickbarrelvaultswiththreedifferent aspect ratio between the arch rise and the curvature radius are considered (1, 0.75 and 0.6). Two different load patterns are analyzed: vertical and horizontal load, with distributions proportional to the self-weight. The mechanical characteristics of the masonry, the GFRP mesh and the reinforced mortar coating are assessed through experimental tests. The simulations permitted to evaluate the collapse mechanisms of the vaults, governed by the flexural behavior.The great effectiveness of the reinforcement technique was evidenced by comparing both the resistance and the displacement capacity of reinforced and unreinforced vaults
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