TY - CONF A1 - Hothan, Sascha T1 - Influence of lateral constraint on the loadbearing and deformation characteristics of hollow core slabs N2 - Deckensysteme aus Spannbeton-Hohlplatten (engl.: Hollow Core Slabs, HC-Platten) werden im Hochbau insbesondere aus wirtschaftlichen Gründen eingesetzt. Vorteile gegenüber Massivdecken in Ortbetonweise ergeben sich insbesondere aus dem hohen Vorfertigungsgrad, geringem Eigengewicht und der Möglichkeit großer Spannweiten bei relativ niedrigen Querschnitten. Bei einem 2007 aufgetretenen Brandereignis in einem Parkhaus in Rotterdam kam es infolge Horizontalrissbildung in den Plattenstegen zu einer teilweisen Ablösung des unteren Plattenspiegels. Dies hatte eine europaweite Diskussion zur brandschutztechnischen Bewertung dieser Bauart zur Folge. Mittlerweile liegen gutachterliche Stellungnahmen, Literaturauswertungen und auch jüngere Forschungsarbeiten zum Feuerwiderstand von Konstruktionen aus Spannbeton-Hohlplatten vor. In den Untersuchungen wurde unter anderem das Tragverhalten von HC-Platten bei starrer Auflagerung, insbesondere hinsichtlich der Querkrafttragfähigkeit, untersucht. Ein bei der Prüfung und Bewertung von Spannbeton-Hohlplatten bisher kaum beachteter Aspekt ist die im Brandfall auftretende Behinderung der Querdehnung infolge umgebender Bauteile oder Tragwerksteile. Im Bauwerk kann für HC-Platten eine Querdehnungsbehinderung im Brandfall auftreten, wenn eine steife Begrenzung des brandbeanspruchten Deckenbereiches vorliegt, z.B. durch Treppenhauskerne oder auch durch umgebende Decken-felder bei lokaler Brandbeanspruchung. Ferner legten Versuchsergebnisse nahe, dass eine Aufbetonschicht die Zwängungen in der HC-Platte verstärkt. Die Problematik der Querdehnungsbehinderung im Brandfall wurde auch in Gremien der Bauaufsicht sowie im zuständigen Sachverständigenausschuss des Deutschen Instituts für Bautechnik (SVA 463 Tragwerksbemessung für Brandeinwirkung) erörtert. Dabei wurde anhand vorgelegter Studien und numerischer Voruntersuchungen deutlich, dass die Bildung von Horizontalrissen in den Plattenstegen auch bei HC-Platten ohne Aufbeton auftreten kann. Um den Einfluss der Querdehnungsbehinderung zu klären wurden an der BAM entsprechende experimentelle und numerische Untersuchungen an Decken-feldern aus Spannbeton-Hohlplatten mit unterschiedlichem Grad der seitlichen Zwängung durchgeführt. Im Beitrag werden die im Realmaßstab durch-geführten Brandversuche beschrieben und deren Ergebnisse und daraus abgeleiteten Erkenntnisse vorgestellt. T2 - 4th Symposium Structural Fire Engineering – TU Braunschweig 2017 CY - Braunschweig, Germany DA - 2017-09-12 KW - Hollow-core slabs KW - Fire resistance KW - Fire safety KW - Lateral constraint PY - 2017 AN - OPUS4-42423 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Häßler, Dustin A1 - Becker, Andreas A1 - Fürst, Richard A1 - Hothan, Sascha ED - Simões da Silva, Luís ED - Vila Real, Paulo ED - Santiago, Aldina ED - Craveiro, Hélder ED - Laim, Luís T1 - Fire resistance testing of steel tension members with hollow section protected by intumescent coating N2 - This book presents the proceedings of the Thirteenth International Conference Structures in Fire. The conference took place at the Department of Civil Engineering, University of Coimbra, Portugal, from 19 to 21 June 2024, under the auspices of the SIF movement. Structural fire safety is a crucial aspect of the design of buildings and infrastructures. Significant advances in research have increased the knowledge on this topic. However, until the 1990s, there were few forums for structural fire engineers to exchange ideas and share research findings. SIF (Structures in Fire) specialised workshop series was conceived in the late 1990s and the “First International SIF Workshop” was held in Copenhagen, Denmark in 2000, followed by workshops in Christchurch, New Zealand (2002), Ottawa, Canada (2004) and Aveiro, Portugal (2006). The series of workshops evolved into conferences and the 2008 event in Singapore was the fifth International Conference on Structures in Fire. This was followed by events in East Lansing, USA (2010), Zurich, Switzerland (2012), Shanghai, China (2014), New Jersey, USA (2016), Belfast, UK (2018), Brisbane, Australia (2020) and Hong Kong, China (2022). Information about previous conferences, including complete proceedings, can be found at www.structuresinfire.com. The main mission of SIF conferences is to provide an opportunity for researchers and engineers from the global structural fire engineering community to participate, share and discuss the recent findings, innovations and developments with their peers in an open and international forum. Following the great success of the previous International Conferences, the University of Coimbra was selected to host the 13th International Conference on Structures in Fire. As with most of the recent conferences, the number of papers submitted far exceeds the number of papers that can be accommodated in the three-day programme, even with two parallel sessions. SIF 2024 received 249 abstracts before the deadline and accepted 172 abstracts after the review process by at least three reviewers from the scientific committee. These proceedings represent 132 full papers, collectively representing the state of the art in fundamental knowledge and practical application of structures in fire. Forty-two countries from around the globe have contributed to them. The papers are grouped into the following research topics: Applications of Structural Fire Engineering, Composite Structures in Fire, Concrete Structures in Fire, Timber Structures in Fire, Masonry Structures in Fire, Steel Structures in Fire, Experimental Research of Structures in Fire, Numerical Modelling of Structures in Fire, Other Topics Related to Structures in Fire. Finally, the Organizing Committee would like to thank the continuous support from the SIF Steering Committee chaired by Prof Jean-Marc Franssen. We also would like to thank to the Scientific Committee chaired by Prof Paulo Vila Real, the authors and all the supporting staff (and volunteer team) from the Institute for Sustainability and Innovation in Structural Engineering (ISISE) in Coimbra, for making SIF 2024 a successful conference. DA - 19.06.2024 KW - Fire resistance KW - Fire test KW - Intumescent coating KW - Steel KW - Tension member PY - 2024 DO - https://doi.org/10.30779/cmm_SIF24 SP - 1173 EP - 1183 PB - CMM – Portuguese Steelwork Association AN - OPUS4-60815 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Neugum, Tim A1 - Stelzner, Ludwig A1 - Häßler, Dustin A1 - Zehfuß, Jochen A1 - Hothan, Sascha T1 - Application of the substructure method to assess the fire resistance of thermally restrained columns N2 - Usually, the fire resistance of load-bearing structural elements is determined by single members testing. A mechanical load is applied to the member in a force-controlled manner and is maintained constant throughout the fire test. After applying the mechanical load, the thermal exposure starts according to the ISO 834 fire curve. In this conventional test method, no interaction between the tested member and the entire building structure is considered. In buildings, the surrounding structure can restrain the thermal expansion of a member in case of fire. This may have both positive and negative effects on the fire resistance of this structural element. Several years ago, the Institute for Sustainability and Innovation in Structural Engineering (ISISE) at the University of Coimbra in Portugal and the Bundesanstalt für Materialforschung und prüfung (BAM) in Germany carried out fire tests on circular and square steel-reinforced concrete columns with restrained thermal expansion. BAM´s column test furnace allows the specimen to be subjected to thermal exposure and mechanical loading simultaneously. In addition, this device has a substructure test module, which can also provide restrained test conditions. In an ongoing research project at BAM and Technische Universität Braunschweig, the effect of restrained test conditions on the behaviour of steel-reinforced columns under fire exposure is further investigated. T2 - 8th International RILEM Workshop on Concrete Behaviour due to Fire Exposure CY - Krakow, Poland DA - 18.09.2025 KW - Substructure method KW - Surrounding structure KW - Fire resistance KW - Restrained columns KW - Concrete PY - 2025 SP - 1 EP - 2 AN - OPUS4-64582 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -