TY - RPRT A1 - Kühn, W. A1 - Korzen, Manfred A1 - Paetsch, O. T1 - Fast data assimilation in fire tests of steel members N2 - This report presents a fast data assimilation method to produce an interpolating time and space temperature distribution for steel members subject to fire testing. The method assimilates collected temperature data into the numerical integration of the heat equation. This physically based method also allows the computation of lateral and axial heat flux into and inside the member. PY - 1998 UR - https://nbn-resolving.org/urn:nbn:de:0297-zib-3766 SN - 0933-7911 IS - SC-98-33 SP - 1 EP - 14 PB - Konrad-Zuse-Zentrum für Informationstechnik Berlin (ZIB) CY - Berlin AN - OPUS4-12019 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Kamlah, M. A1 - Korzen, Manfred A1 - Tsakmakis, Ch. T1 - Uniaxial ratchetting in rate-independent plasticity laws PY - 1997 SN - 0001-5970 SN - 1619-6937 VL - 120 SP - 173 EP - 198 PB - Springer CY - Wien AN - OPUS4-12020 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Paetsch, O. A1 - Stalling, D. A1 - Korzen, Manfred T1 - Online-Visualisierung von Brandversuchen an Bauteilen N2 - For the evaluation of the fire resistance time of structural elements thermal and mechanical loadings are applied to the specimen. Up to now the monitored data is represented in tabular form and simple plots. In the following a visualization system to show the data in its geometrical context is discussed. T2 - VisEng'97 - Visualisierung im Ingenieurbereich "Pre- und Postprocessing in Strömungs- und Strukturmechanik" CY - Stuttgart, Deutschland DA - 1997-05-06 PY - 1997 UR - http://www.zib.de/visual-publications/sources/src-1997/brandvis.pdf SP - 1 EP - 13 CY - Stuttgart AN - OPUS4-12021 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Bock, Hans Michael A1 - Korzen, Manfred T1 - Brandschutztechnische Ertüchtigung von Stahlverbundhohlprofilstützen - Bericht über die "Proving Trials" an einem europäischen Prüfverfahren T2 - Beiträge zum 33. Forschungskolloquium CY - Berlin, BAM, Deutschland DA - 1996-10-10 PY - 1996 VL - 33 SP - 62 EP - 71 PB - Dt. Ausschuss für Stahlbeton im DIN CY - Berlin AN - OPUS4-12023 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Korzen, Manfred A1 - Schriever, Robert A1 - Ziener, Kai-Uwe A1 - Paetsch, O. A1 - Zumbusch, G. W. ED - Ziebst, J. ED - Bessers, J. ED - Frenz, H. T1 - Real-time 3-D visualization of surface temperature fields measured by thermocouples on steel structures in fire engineering T2 - Local strain and temperature measurments in non-uniform fields at elevated temperatures CY - Berlin, Germany DA - 1996-03-14 PY - 1996 SP - 253 EP - 262 PB - Woodhead Publishing Ltd CY - Berlin AN - OPUS4-12024 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Haupt, P. A1 - Korzen, Manfred ED - Fan, J. ED - Murakami, S. T1 - On the mathematical modelling of material behavior in continuum mechanics T2 - International Conference on Constitutive Laws for Engineering Materials CY - Chongqing, China DA - 1989-08-11 PY - 1989 SN - 0-08-037887-0 SN - 7-8000-3068-7 VL - 1 SP - 456 EP - 459 PB - International Academic Publ. AN - OPUS4-12027 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Korzen, Manfred ED - Owen, D. T1 - A numerical method for the integration of a viscoelastic-plastic constitutive model T2 - 2nd International Conference on Computational Plasticity (COMPLAS) CY - Barcelona, Spain DA - 1989-09-18 PY - 1989 SN - 0-906674-71-9 IS - 2 SP - 603 EP - 613 PB - Pineridge Press CY - Swansea AN - OPUS4-12079 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Korzen, Manfred A1 - Haupt, P. ED - Cailletaud, G. ED - Delobelle, P. T1 - A new constitutive model for the phenomenological representation of rate-dependent and rate-independent material behavior T2 - International Seminar on the Inelastic Behaviour of Solids CY - Besançon, France DA - 1988-08-30 PY - 1988 N1 - Serientitel: Proceedings of the International MECAMAT Seminar – Series title: Proceedings of the International MECAMAT Seminar IS - 3 SP - I-41-I-52 PB - MECAMAT CY - Besançon AN - OPUS4-12080 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Korzen, Manfred A1 - Haupt, P. T1 - Über eine Materialgleichung vom viskoelastisch-plastischen Typ PY - 1988 SN - 0044-2267 SN - 0946-8463 VL - 68 IS - 4 SP - T 203 EP - T 204 PB - Wiley-VCH CY - Potsdam AN - OPUS4-12081 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Korzen, Manfred A1 - Haupt, P. A1 - Tsakmakis, Ch. T1 - Über Verfestigungsmodelle der Plastizitätstheorie in funktionaler Darstellung PY - 1987 SN - 0044-2267 SN - 0946-8463 VL - 67 IS - 4 SP - T 193 EP - T 194 PB - Wiley-VCH CY - Potsdam AN - OPUS4-12082 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Korzen, Manfred T1 - Experimentally observed phenomena vis-à-vis current constitutive theories PY - 1987 SN - 0143-0084 VL - 22 SP - 171 EP - 184 PB - Applied Science Publ. Ltd. CY - Barking, Ess. AN - OPUS4-12083 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Korzen, Manfred A1 - Neves, C. A1 - Rodrigues, J.P.C. A1 - Valente, J.C. ED - Vila Real, P. T1 - Behaviour in fire of thermally restrained compressed steel members experimental and numerical approach T2 - 4th International Workshop "Structures in Fire" (SiF´06) CY - Aveiro, Portugal DA - 2006-05-10 KW - Fire Resistance KW - Thermal Restraint PY - 2006 SN - 972-789190-X VL - 1 SP - 273 EP - 286 PB - University of Aveiro AN - OPUS4-12462 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Korzen, Manfred T1 - Testing and research at BAM in fire engineering T2 - Konferenzzyklus "Neue Wege zur Sicherheit bei urbanen Bränden" Universität Coimbra CY - Coimbra, Portugal DA - 2006-05-20 PY - 2006 AN - OPUS4-12564 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Korzen, Manfred T1 - Behaviour in fire of thermally restrained compressed steel members - experimental and numerical T2 - 4th International Workshop Structures in Fire- SIF'06 CY - Aveiro, Portugal DA - 2006-05-10 PY - 2006 AN - OPUS4-12565 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Korzen, Manfred A1 - Staus, St. T1 - Isotrope nichtlineare Viskoelastizität mit Hilfe von Maßstabsfunktionen der Gedächtnisspannung PY - 1994 SN - 0044-2267 SN - 0946-8463 VL - 74 SP - 325 EP - 326 PB - Wiley-VCH CY - Potsdam AN - OPUS4-11489 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Korzen, Manfred A1 - Tsakmakis, Ch. T1 - Uniaxial ratchetting in linear viscoelasticity PY - 1997 SN - 0001-5970 SN - 1619-6937 VL - 120 SP - 173 EP - 198 PB - Springer CY - Wien AN - OPUS4-11490 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Pan, Zuo-Fen A1 - Schriever, Robert A1 - Bock, Hans Michael A1 - Korzen, Manfred T1 - Comparison of the temperature distribution in isolated steel columns tested in two furnaces PY - 1997 SN - 0015-2684 SN - 1572-8099 VL - 33 SP - 316 EP - 335 PB - Kluwer Academic CY - Norwell, Mass. AN - OPUS4-11492 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Korzen, Manfred A1 - Tsakmakis, Ch. T1 - Some remarks on kinematic hardening PY - 1993 SN - 0334-8938 VL - 4 IS - 2 SP - 129 EP - 139 PB - Freund Publ. CY - London AN - OPUS4-11486 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Korzen, Manfred A1 - Magonette, G. A1 - Buchet, P. T1 - Mechanical loading of columns in fire tests by means of the substructuring method N2 - In contrast to real fires in classical fire resistance tests building elements are considered as stand alone elements without interaction with the surrounding building. In order to run a fire test in a more realistic fashion the development of special experimental techniques is required. As a contribution to overcome the situation the application of the substructuring method, a special hybrid method known from earthquake engineering, has been adopted to fire engineering. The paper gives a presentation of the concept including a short description of utilized system components. T2 - Interflam '99: 8th International Fire Science and Engineering Conference CY - Edinburgh, Scotland, UK DA - 29.06.1999 PY - 1999 SN - 0-9532312-3-2 VL - 2 SP - 911 EP - 914 PB - Interscience Communications CY - London AN - OPUS4-11677 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Korzen, Manfred A1 - Ziener, Kai-Uwe A1 - Kühnast, Uwe A1 - Magonette, G. A1 - Buchet, Ph. A1 - Dzbikowicz, Z. ED - Virdi, K. T1 - Substructuring in fire engineering PY - 2000 SN - 0-419-25960-0 SP - 137 EP - 141 PB - spon CY - London AN - OPUS4-11675 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Korzen, Manfred T1 - Substrukturtechnik: Eine hybride Prüfmethode - Überblick mit Anwendung im Brandingenieurwesen T1 - Substructuring: A hybrid test method - Survey with application in fire engineering N2 - Im Gegensatz zu realen Bränden werden Bauelemente bei klassischen Brandversuchen als Einzelbauteile ohne Wechselwirkung mit dem umgebenden Gebäude betrachtet. Um einen Brandversuch realistischer durchführen zu können, ist die Entwicklung spezieller experimenteller Methoden erforderlich. Als Beitrag zur Verbesserung der Situation wurde die Anwendung der Substrukturtechnik, einer speziellen hybriden Prüfmethode, die aus dem Erdbebeningenieurwesen bekannt ist, auf das Brandingenieurwesen übertragen. N2 - In contrast to real fires in classical fire resistance tests building elements are considered as stand alone elements without interaction with the surrounding building. In order to run a fire test in a more realistic fashion the development of special experimental techniques is required. As a contribution to overcome the situation the application of the substructuring method, a special hybrid method known from earthquake engineering, has been adopted to fire engineering. T2 - Tagung Werkstoffprüfung 1999 CY - Bad Nauheim, Germany DA - 02.12.1999 PY - 1999 SP - 215 EP - 218 PB - Deutscher Verband für Materialforschung und -prüfung (DVM) CY - Berlin AN - OPUS4-11676 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Sippel, J. A1 - Siegesmund, S. A1 - Weiss, Thomas A1 - Nitsch, K.-H. A1 - Korzen, Manfred ED - Prikryl, R. T1 - Decay of natural stones caused by fire damage T2 - European Geosciences Union General Assembly conference CY - Vienna, Austria DA - 2005-04-25 KW - 66Natural building stones KW - Fire resistance KW - Thermal expansion KW - Mineral reactions PY - 2007 SN - 1-86239-218-8 SN - 0305-8719 N1 - Serientitel: Geological Society special publication – Series title: Geological Society special publication IS - 271 SP - 139 EP - 151 PB - Geological Society CY - London AN - OPUS4-14722 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Korzen, Manfred T1 - Testing and research at BAM in fire engineering with special concern to the development of the substructuring method T2 - Invited Lecture at the European Laboratory of Structural Assessment (ELSA) of the European Commission (EC) Joint Research Centre (JRC) CY - Ispra, Italy DA - 2007-03-15 PY - 2007 AN - OPUS4-14759 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Huismann, Sven A1 - Korzen, Manfred A1 - Rogge, Andreas T1 - Entwicklung und Validierung eines allgemeinen Rechenverfahrens für Stahlbetonstützen aus hochfestem Beton unter Brandbeanspruchung N2 - Ausgehend von einer kritischen Analyse der Materialkennwerte für normalfesten (NFB) und hochfesten Beton (HFB) im Eurocode 2 wurden in grundlegenden Untersuchungen an der BAM exemplarisch für einen HFB die thermomechanischen Materialkennwerte bestimmt, um auf der Basis eines geeigneten Materialmodells das Verhalten von Stahlbetonstützen aus HFB unter Brandbeanspruchung zu simulieren. Die Validierung des Modells erfolgte mittels großmaßstäblicher Brandversuche an belasteten Stahlbetonstützen aus dem gleichen HFB wie in den Materialuntersuchungen. Es konnte gezeigt werden, dass die Festigkeit als charakteristischer Parameter des Materialmodells zwingend auf der Basis instationärer Versuche – und nicht aus stationären Versuchen wie bei NFB üblich – bestimmt werden muss. Mit den in vorgeschlagenen Materialbeziehungen für HFB wird das Tragverhalten der untersuchten Stützen dagegen deutlich überschätzt, was sich in den numerischen Simulationen insbesondere durch zu geringe Verformungen äußert.------------------------------------------------------------------------------------------------------ Development and Validation of an Advanced Calculation Model for High Strength Concrete Columns Subjected to Fire Loading Following a critical analysis of the material parameters of normal strength (NSC) and high strength concrete (HSC) presented in Eurocode 2 the thermo-mechanical material parameters of one representative HSC were identified. Using these parameters and based on an appropriate material model the behavior of HSC columns was simulated. The validation of the model was realized through real scale fire resistance tests on loaded columns of the same type of HSC as in the material identification tests. It was found that the strength as a characteristic parameter of the material model has to be identified on the basis of transient creep tests and not of stationary tests, respectively as realized usually for NSC. It could be shown that the structural behavior of the tested columns is overestimated if the numerical simulations are based on the material properties of HSC as proposed in. This feature is expressed especially through insufficient displacements. KW - Brandschutz KW - Verformungsverhalten KW - Hochleistungsbeton KW - Nichtlineare Berechnungsverfahren KW - Modellierung KW - EC KW - Eurocode KW - Normen KW - Berechnungs- und Bemessungsverfahren KW - Normen/Vorschriften/Richtlinien KW - Versuche KW - Hochfester Beton KW - Feuerwiderstandsdauer KW - Finite-Elemente-Methode PY - 2012 DO - https://doi.org/10.1002/best.201200010 SN - 0005-9900 SN - 1437-1006 VL - 107 IS - 6 SP - 372 EP - 378 PB - Ernst CY - Berlin AN - OPUS4-26100 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Hörold, Andreas A1 - Schartel, Bernhard A1 - Trappe, Volker A1 - Korzen, Manfred A1 - Naumann, Maurice T1 - Structural integrity in fire: an intermediate-scale approach T2 - ECCM15 - 15th European conference on composite materials CY - Venice, Italy DA - 2012-06-24 KW - Intermediate-scale test method KW - Structural integrity investigation KW - Fully developed fire KW - Carbon fibre reinforced plastics CFRP PY - 2012 SN - 978-88-88785-33-2 SP - 1 EP - 8(?) AN - OPUS4-26380 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Hörold, Andreas A1 - Schartel, Bernhard A1 - Trappe, Volker A1 - Korzen, Manfred T1 - An intermediate-scale fire testing approach on the structural integrity of lightweight materials N2 - Carbon or glass über composites and Sandwich structures, the lightweight materials of choice for aviation, naval, offshore and construction show an enormous energy saving potential. Their combination of excellent specific mechanical properties, high corrosive resistance and thermal insulation properties in combination with various adoptable fabrication techniques leading to mass and fuel cost reduction. The most limiting single factor for a wider use of fibre reinforced plastics (FRP) in particular as elements for structural application is believed to be their fire behaviour (Mouritz and Gibson, 2006). FRPs promote burning by themselves consuming the stabilizing polymeric matrix while embedded fibers (glass, carbon) persisting the flame (Mouritz et ah, 2006). Already at elevated temperatures (100 - 200 °C) the matrix softens with a loss in mechanical properties (Perret et al., 2011, Mouritz and Gibson, 2006). For this reason the stability of the structural component is decreased severely. Fire behavior becomes the major hazard to worry about, increasingly demanding targetoriented investigation, suitable testing and tailored development. Experimental approaches in the bench-scale have been proposed to investigate the structural integrity in the past (La Delfa et al., 2009, Gibson et al., 2010, Seggewiß, 2011, Mouritz and Gardiner, 2002, Schartel et al.). Ascribed to the small-scale neither the mechanical properties nor the effects of fire may be represented satisfactorily. Flence, the task is to perform more realistic investigations under adequate compressive loads in fully developed fires, based on suitable specimen sizes. Also (La Delfa et al., 2009)) have announced that it is evident that larger scale test of composites are needed. The aim of this study is to present a developed intermediate-scale test setup to perform more realistic investigations (Hörold et al.). Mechanical loading is generated by a column furnace in terms of compression due to a more severe response of specimens in fire tests (Seggewiß, 2011, Gibson et al., 2012, Feih et al., 2008, Feih et al., 2007). An oil burner used to determine the burnthrough resistance of thermal/acoustic insulation materials provides fire directly onto one side of the specimen (Federal Aviation Administration, 2003). Generating a fully developed fire the NexGen burner offers a homogenous heat flux of ~ 180 kW/m2. The intermediate-scale is addressed by specimen sizes either 500 x 500 mm or 1000 x 500 mm with a maximum thickness of 50 mm. The specimen attachment is realized by a compression device that was designed to apply the compressive loads, figure 1. The test setup for specimens with component like dimensions allows realistic investigations up to structural failure in absence and presence of fire load. A first test series was carried out with different levels of loading while the fire remained unchanged. Failure mechanisms, temperature distributions, diversity of FRPs regarding fiber, matrix, lay-up and core as well as flame retardant Systems are in the scope of investigation. T2 - Fire and materials 2013 - 13th International conference and exhibition CY - San Francisco, CA, USA DA - 28.01.2013 PY - 2013 SP - 221 EP - 226 PB - Interscience Communications CY - London, UK AN - OPUS4-27782 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Korzen, Manfred A1 - Rodrigues, J.P.C. A1 - Laím, L.M.S. T1 - Fire resistance tests on circular concrete columns N2 - Most of the previous studies on reinforced concrete columns with elastically restrained thermal elongation were carried out on square, rectangular or ‘+’-shaped cross sections. The fire resistance of these columns is probably more compromised than in circular columns due to the phenomenon of concrete detachment in the corners of the cross-section. In order to examine the influence of several parameters on the behaviour in fire of circular reinforced concrete columns with restrained thermal elongation, several fire resistance tests were carried out. The parameters tested were load, restraint level, slenderness of the column and the longitudinal reinforcement ratio. In the fire resistance tests the specimens were exposed to the ISO 834 Standard fire curve and the critical time and temperature and failure modes were determined. The test results mainly indicated that the spalling phenomenon may also occur in circular columns and so reducing its fire resistance. The restrained level might not so much relevant concerning the fire resistance of circular reinforced concrete columns. T2 - Interflam 2013 - 13th International fire science & engineering conference CY - Egham, Surrey, UK DA - 24.06.2013 KW - Fire KW - Column KW - Concrete KW - Circular KW - Restraining PY - 2013 SN - 978-0-9556548-9-3 SP - 1119 EP - 1130 PB - Interscience Communications Limited AN - OPUS4-29695 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Korzen, Manfred T1 - Fire resistance tests on circular concrete columns T2 - Interflam 2013 - 13th International Conference and Exibition on Fire Science and Engineering CY - London, England DA - 2013-06-24 PY - 2013 AN - OPUS4-29645 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Hörold, Andreas A1 - Schartel, Bernhard A1 - Trappe, Volker A1 - Korzen, Manfred A1 - Naumann, Maurice T1 - Structural integrity of sandwich structures in fire: an intermediate-scale approach N2 - A test set-up in intermediate scale was conceived to investigate the structural integrity of materials under fire. The task was to develop a realistic test scenario targeting component-like behaviour. Carbon-fibre-reinforced sandwich specimens (500 X 500 X 20 mm) were used to examine failure mechanisms, times to failure and critical failure loads under compression. Fire tests were performed with fully developed fire applied to one side of the specimen by an oil burner. In a first test series, the applied load was varied, but the fully developed fire remained unchanged. In general, times to failure were short. Decreased load levels resulted in prolonged times to failure and led to a different failure mechanism. Results obtained in the test series were compared with a bench-scale study (150 X 150 X 20 mm) investigating identical material. The comparison clearly revealed the influence of size on the time to failure and the load-bearing capacity. KW - Fire testing KW - Structural integrity KW - Carbon-fibre-reinforced plastics KW - Fully developed fire KW - Composites PY - 2013 DO - https://doi.org/10.1080/15685543.2013.816620 SN - 0927-6440 SN - 1568-5543 VL - 20 IS - 9 (Special Issue: ECCM15: Part 3) SP - 741 EP - 759 PB - VSP CY - Zeist AN - OPUS4-29647 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Korzen, Manfred T1 - Assessment of the fire resistance of structural and compartimentation elements by means of experimental tests T2 - Vortrag innerhalb des Master Course "Fire Engineering" des Fachbereichs Bauingenieurwesen der Universität Coimbra (Seguranca Contra Riscos de Incendio em Edificios, Mestrado em Ciencias da Construcao da Universidade de Coimbra) CY - Coimbra, Portugal DA - 14.06.2002 PY - 2002 AN - OPUS4-1413 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Korzen, Manfred A1 - Ziener, Kai-Uwe A1 - Riemer, Sven A1 - Magonette, G. A1 - Buchet, P. ED - Ural, O. ED - Abrantes, V. ED - Tadeu, A. T1 - Some remarks on the substructuring method applied to fire resistance tests of columns N2 - In fire resistance tests, building elements are considered as stand-alone elements without interaction with the surrounding building. As a contribution to overcome the situation, the application of the substructuring method has been adopted to fire engineering. The paper gives some remarks on the aforementioned experimental method. The analysis is based on the results of two built-in column fire resistance tests, i.e. one test with an unprotected column at the ground floor of the 8-storey steel framed building at Cardington and another test at BAM with an unprotected column and simulated axial restraining stiffness by the substructuring method. T2 - 30th IAHS World Congress on Housing ; Housing Construction CY - Coimbra, Portugal DA - 09.09.2002 KW - Fire engineering KW - Fire resistance KW - Computer supported testing KW - Hybrid method PY - 2002 SN - 972-9027-31-5 VL - 3 SP - 1601 EP - 1607 CY - Coimbra, Portugal AN - OPUS4-1757 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Huismann, Sven A1 - Korzen, Manfred A1 - Weise, Frank A1 - Meng, Birgit ED - Rogge, A. ED - Meng, B. T1 - Betonabplatzungen unter Feuerangriff und der Einfluss von Polypropylenfasern auf die Mikrorissbildung T2 - 52. DAfStb-Forschungskolloquium CY - Berlin, Germany DA - 07.11.2011 PY - 2011 SN - 978-3-9814281-0-0 SP - 163 EP - 171 PB - Bundesanstalt für Materialforschung und -prüfung (BAM) CY - Berlin AN - OPUS4-25185 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Huismann, Sven A1 - Korzen, Manfred A1 - Rogge, Andreas ED - Rogge, A. ED - Meng, B. T1 - Stahlbetonstützen aus hochfestem Beton unter Brandbeanspruchung und die Anwendung allgemeiner Rechenverfahren T2 - 52. DAfStb-Forschungskolloquium CY - Berlin, Germany DA - 07.11.2011 PY - 2011 SN - 978-3-9814281-0-0 SP - 154 EP - 162 PB - Bundesanstalt für Materialforschung und -prüfung (BAM) CY - Berlin AN - OPUS4-25186 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Pereira, F. A1 - Pistol, Klaus A1 - Korzen, Manfred A1 - Weise, Frank A1 - Pimienta, P. A1 - Carré, H. A1 - Huismann, Sven ED - Koenders, E.A.B. ED - Dehn, F. T1 - Monitoring of fire damage processes in concrete by pore pressure and acoustic emission measurements N2 - This paper presents the combined use of acoustic emission (AE), gas pore pressure and temperature measurements (PT). The simultaneous application of both techniques represents a new methodology in the context of fire spalling and contributes to a better understanding of the mechanisms of fire spalling, particular with regard to the interaction of micro cracking and pore pressure evolution. The study presents fire tests on normal strength concrete specimens with and without reinforcement at ISO Standard fire and at hydrocarbon (HC) fire. Supported by AE-analysis, it can be shown that due to the higher heating rate of the HC-fire in comparison to the ISO Standard fire the damage processes inside the concrete during the exposure are increased combined with augmenting the concrete permeability. As a consequence lower pore pressures were measured. However, despite the lower pore pressures, explosive spalling was observed. T2 - 2nd International RILEM workshop on concrete spalling due to fire exposure CY - Delft, The Netherlands DA - 05.10.2011 KW - Ordinary concrete KW - High temperature KW - Gas pore pressure KW - Acoustic emission KW - Spalling PY - 2011 SN - 978-2-35158-118-6 SP - 69 EP - 77 PB - RILEM Publications AN - OPUS4-24818 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Covi, Patrick A1 - Tondini, Nicola A1 - Korzen, Manfred A1 - Lamperti Tornaghi, Marco T1 - Hybrid fire following earthquake testing of a steel braced frame N2 - The paper presents the results of an experimental-numerical analysis aimed at investigating the performance of passive fire protections applied to steel columns under fires following earthquake (FFE) scenarios. In particular, five FFE tests on columns belonging to a steel braced frame were performed at the Bundesanstalt für Materialforschung und -prüfung (BAM, Federal Institute for Materials Research and Testing) by means of hybrid fire testing technique. In particular, an internal steel column of the ground floor belonging to a three-bay, four-storey concentrically braced steel building was tested, whilst the effect of the remainder of the structure was numerically simulated by means of an equivalent axial stiffness. Since the structure has a low degree of redundancy, the loss of a column can trigger global structural collapse. Two FFE tests were performed without any fire protection system and the other FFE tests were performed with three different fire protection solutions, i.e. conventional and seismic-resistant calcium silicate boards as well as vermiculite spray-based protection. Each column was firstly subjected to horizontal and vertical displacements resulting from seismic nonlinear time-history analysis performed on the numerical model of the case study. Then, the furnace was switched on and the ISO 834 standard fire curve was applied to the specimen. Numerical models were developed and calibrated on experimental data using different types of finite elements. The calibrated models with the presence of axial and rotational springs accurately captured the transition from pre- to post-buckling behavior. These findings highlight the importance of accurate modelling of the boundary conditions. Despite the fact, that seismic intensity was at life safety limit state, it was also found that the seismic damage of the fire protections was not high enough to hinder the fire performance of the fire protections. KW - Fire following earthquake KW - Concentrically braced steel frames KW - Fire protections KW - Numerical simulations KW - Experimental tests KW - Post-earthquake fire PY - 2025 UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-645186 DO - https://doi.org/10.1016/j.conbuildmat.2025.143731 SN - 0950-0618 VL - 496 SP - 1 EP - 22 PB - Elsevier CY - Oxford AN - OPUS4-64518 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CHAP A1 - Meftah, F. A1 - Pesavento, F. A1 - Davie, C. A1 - Dal Pont, S. A1 - Zeiml, M. A1 - Korzen, Manfred A1 - Millard, A. ED - Millard, A. ED - Pimienta, P. T1 - Advanced Modelling N2 - In this chapter, advanced models based on a General thermo-Hydro-Mechanical (THCM) Framework are considered. In These approaches, the concrete is considered as a porous medium, the pores of which are partly filled by gas (a mixture of air and vapour) and water. KW - Concrete KW - High temperature KW - Stress-strain-relation PY - 2019 SN - 978-3-030-11994-2 SN - 978-3-030-11995-9 DO - https://doi.org/10.1007/978-3-030-11995-9 SN - 2213-204X SN - 2213-2031 SP - 27 EP - 65 PB - Springer CY - Cham, Switzerland AN - OPUS4-50174 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CHAP A1 - Huismann, Sven A1 - Zeiml, M. A1 - Korzen, Manfred A1 - Millard, A. ED - Millard, A. ED - Pimienta, P. T1 - Engineering Modelling N2 - This chapter presents the most commonly used approach to analyse the thermo-mechanical behaviour of concrete structures subjected to high temperatures as in the case of fire loading. Prescriptions of the Eurocode are detailed for the thermal as well as the mechanical analysis. Finally, recommendations from two national (Austrian and German) guidelines give some improvements for Underground infrastructure. KW - Concrete KW - High temperature KW - Stress-strain-relation PY - 2019 SN - 978-3-030-11995-9 DO - https://doi.org/10.1007/978-3-030-11995-9 SN - 2213-204X SN - 2213-2031 SP - 15 EP - 25 PB - Springer CY - Cham, Switzerland AN - OPUS4-51186 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Daus, Lars-Hendrik A1 - Korzen, Manfred A1 - Schartel, Bernhard T1 - High-throughput fire tests and weathering-induced degradation behaviour of intumescent coatings N2 - In this work, the weathering-induced degradation of intumescent coatings was investigated by a systematic and comprehensive approach. A mechanism is revealed that is proposed to be responsible for the loss of function of intumescent coatings induced by weathering. First, the thermal decomposition of artificially weathered intumescent coatings was examined. To get a better understanding of the weathering and ageing phenomena, the degradation behaviour of the single ingredients during the weathering process was investigated, as well as their chemical and physical interactions. For the systematic approach, the materials that are essential for intumescence (ammonium polyphosphate, pentaerythritol, titanium dioxide, melamine and the binder) are treated with moisture, elevated temperature and UV radiation. Thermogravimetry (TG) and IR spectroscopy were used to compare the initial samples with their different grades of weathering. We demonstrate that ammonium polyphosphate, melamine and the binder are mainly responsible for the ageing process. Further, it was demonstrated that TG and IR spectroscopy are suitable measuring methods to detect the effects of weathering on intumescent coatings. Finally, a small-scale fire test procedure is introduced. Based on the reduction of the sample size, up to 50 samples can be tested in a single fire test. The results of this fire test have the same quality as the results from standard intermediate fire tests corresponding to DIN 4102-8. T2 - 3rd European Symposium on Fire Safety Science CY - Nancy, France DA - 12.09.1018 KW - Weathering KW - Intumescent coatings KW - High-Throughput Fire Tests PY - 2018 UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-472023 UR - http://iopscience.iop.org/article/10.1088/1742-6596/1107/3/032014/pdf DO - https://doi.org/10.1088/1742-6596/1107/3/032014 VL - 1107 SP - 032014 PB - IOP Publishing CY - Bristol AN - OPUS4-47202 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Correia, A.M. A1 - Rodrigues, J.P.C. A1 - Korzen, Manfred T1 - Experimental research on the load-bearing capacity of partially encased steel columns under fire conditons N2 - The composite steel and concrete columns are known to have enhanced fire behaviour when compared with bare steel columns. However there are still aspects that must be clarified, as the influence of the building surrounding structure on the fire resistance of the columns. In this paper, the results of fire resistance tests on partially encased steel columns carried out with two different experimental systems are compared. In one of the experimental systems, the building surrounding structure is materialised by a steel restraining frame, and in the other is performed by the so-called substructuring method. Due to the concept of hybrid substructuring, the entire building is decomposed in two parts: one is represented by the building element under test, whereas the remaining building is simulated numerically in a computer. The main conclusion drawn from this work was that the surrounding structure has a major influence in the development of axial forces in the test columns. Moreover, it was observed that the higher the non-dimensional axial restraint ratio the lower the critical time of the columns. KW - Fire resistance KW - Thermal restraint KW - Composite steel-concrete columns KW - Substructuring method KW - Restraining frame PY - 2012 DO - https://doi.org/10.1260/2040-2317.3.1.81 SN - 2040-2317 VL - 3 IS - 1 SP - 81 EP - 94 PB - Multi-Science Publ. Co. CY - Brentwood AN - OPUS4-25632 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Hauswaldt, Sebastian A1 - Korzen, Manfred A1 - Hartmann, S. ED - Fontana, M. ED - Frangi, A. ED - Knobloch, M. T1 - A continuum-mechanical model for FE-simulations of steel constructions in fire N2 - This paper presents a thermoviscoplastic constitutive model within the framework of continuum mechanics for the description of the behavior of structural steel subjected to fire loading. The model is represented through a set of ordinary differential equations and belongs to the class of so-called unified theories which do not separate plastic and creep strains. The material parameters are identified for the structural steel S 235 on the basis of tension and compression tests at constant temperature with varying strain rates and verified against transient creep test with varying temperature. For effective numerical simulations with the finite element program ABAQUS the model is prepared with a stress algorithm and consistent tangent operator. The simulations are compared with experimental data of fire resistance tests on columns. T2 - SIF 2012 - 7th International conference on structures in fire CY - Zurich, Switzerland DA - 06.06.2012 KW - Constitutive equation KW - Viscoplasticity KW - Endochronic plasticity KW - UMAT KW - Finite element method KW - Fire resistance PY - 2012 DO - https://doi.org/10.3929/ethz-a-007050197 SP - 439 EP - 448 CY - Zurich, Switzerland AN - OPUS4-26108 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -