TY - GEN A1 - Korzen, Manfred A1 - Ziener, Kai-Uwe A1 - Riemer, Sven A1 - Magonette, G. A1 - Buchet, P. T1 - Some Remarks on the Substructuring Method Applied to Fire Resistance Tests of Columns T2 - 30th IAHS World Congress on Housing ; Housing Construction CY - Coimbra, Portugal DA - 2002-09-09 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 - 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 U6 - 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 - 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 - 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 T2 - SIF 2012 - 7th International conference on structures in fire CY - Zurich, Switzerland DA - 2012-06-06 KW - Constitutive equation KW - Viscoplasticity KW - Endochronic plasticity KW - UMAT KW - Finite element method KW - Fire resistance PY - 2012 U6 - 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 - TY - GEN A1 - Korzen, Manfred A1 - Rodrigues, J.P.C. A1 - Correia, A.M. ED - Kodur, V. ED - Franssen, J.-M. T1 - Composite columns made of partially encased steel sections subjected to fire T2 - 6th International conference "Structures in fire" CY - East Lansing, Michigan, USA DA - 2010-06-02 KW - Fire resistance KW - Thermal restraint KW - Composite steel-concrete columns KW - Substructuring method KW - Restraining frame PY - 2010 SN - 978-1-60595-027-3 SP - 341 EP - 348 PB - DEStech Publications, Inc. CY - Lancaster, PA, USA AN - OPUS4-22482 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Korzen, Manfred A1 - Rodrigues, J. P. C. A1 - Correia, A. M. ED - F. Wald, ED - P. Kallerová, ED - J. Chlouba, T1 - Thermal restraint effects on the fire resistance of steel and composite steel and concrete columns T2 - International Conference - Applications of structural fire engineering CY - Prague, Czech Republic DA - 2009-02-19 KW - Fire resistance KW - Thermal restraint KW - Steel columns KW - Steel-concrete columns PY - 2009 SN - 978-80-01-04266-3 SP - 512 EP - 517 CY - Prague, Czech Republic AN - OPUS4-19111 LA - eng 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 - Bünker, J. T1 - Fire stability of glass-fibre sandwich panels: The influence of core materials and flame retardants N2 - Fire resistance has become a key property for structural lightweight sandwich components in aviation, shipping, railway vehicles, and construction. The development of future composite materials and components demands adequate test procedures for simultaneous application of compression and fully developed fire. Therefore an intermediate-scale approach (specimen size = 500 mm x 500 mm) is applied with compressive loads (up to 1 MN) and direct application of a burner to one side of the specimens, as established in aviation for severe burn-through tests. The influence of different core structures (polyvinylchloride foam, polyisocyanorate foam reinforced by stitched glass bridges, and balsa wood) was investigated for glass-fibre-reinforced sandwich specimens with and without flame retardants applied on the fabrics, in the matrix, and on surface for each specimen at the same time. Times to failure were increased up to a factor of 4. The intumescent coating prolongs the time to failure significantly. What is more, using the intrinsic potential of the front skin together with the core to protect a load bearing back skin in sandwich panels, the design of the core – here using the wood core – is the most promising approach. KW - Fire resistance KW - Fire stability KW - Glass-fibre-reinforced plastics KW - Composite KW - Core materials PY - 2017 U6 - https://doi.org/10.1016/j.compstruct.2016.11.027 SN - 0263-8223 SN - 1879-1085 VL - 160 SP - 1310 EP - 1318 PB - Elsevier AN - OPUS4-38622 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Daus, Lars-Hendrik A1 - Schartel, Bernhard A1 - Wachtendorf, Volker A1 - Mangelsdorf, R. A1 - Korzen, Manfred T1 - A chain is no stronger than its weakest link: Weathering resistance of water-based intumescent coatings for steel applications N2 - A systematic approach was used to investigate the weathering-induced degradation of a common water–based intumescent coating. In this study, the coatings are intended for humid indoor applications on steel substrates. The coating contains ammonium polyphosphate, pentaerythritol, melamine, and polyvinyl acetate. By replacing each ingredient with a less water-soluble substance, the most vulnerable substances, polyvinyl acetate and pentaerythritol, were identified. Furthermore, the weathering resistance of the system was improved by exchanging the ingredients. The coatings were stressed by artificial weathering tests and evaluated by fire tests. Thermogravimetry and Fourier-transform infrared spectroscopy were used to study the thermal decomposition. This study lays the foundation for the development of a new generation of water-based intumescent coatings. KW - Intumescence KW - Fire resistance KW - Fire protective coatings KW - Weathering KW - Thermogravimetric analyses PY - 2021 U6 - https://doi.org/10.1177/0734904120961064 SN - 0734-9041 SN - 1530-8049 VL - 39 IS - 1 SP - 72 EP - 102 PB - SAGE AN - OPUS4-52015 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Talebi, Elnaz A1 - Korzen, Manfred A1 - Hothan, Sascha T1 - The performance of concrete filled steel tube columns under postearthquake fires N2 - In this study, a nonlinear three-dimensional finite element (FE) model was developed and validated to investigate the response of concrete filled tube (CFT) columns subjected to post-earthquake fires. Three steps were considered successively in the modelling, namely, cyclic, thermal and structural analyses. Outputs from the cyclic loading including residual deformationswere imposed as an initial condition to the thermal-stress model, imitating the seismic response of the column. Subsequently, a nonlinear sequentially thermal-stress analysis was conducted to simulate the fire response of column after the earthquake. The proposed FE model was validated by comparing the simulation resultswith the observations of full-scale fire and cyclic tests available in the literature. The validated numericalmodelwas then used to study the behavior of CFT columns under the combined action of earthquake and fire as a multi-hazard event. Three probable seismic damage scenarios were considered in the column, namely, middle length, bottom and top end region damages. The level of damage was assumed as a high damage level, presuming that the column reached 50% of its lateral resistance while still maintaining ist overall stability after the earthquake. The results showed that the top and bottom end region damages have not significantly influence the fire response of the damaged column. Besides, the column with the middle span damage performed a lesser fire resistance time owing to the coincidence of damage location to that of onset of global buckling. KW - Post-earthquake fire KW - Concrete filled tube (CFT) column KW - Finite element analysis KW - Seismically damaged column KW - Fire resistance KW - Multi-hazard incident PY - 2018 U6 - https://doi.org/10.1016/j.jcsr.2018.07.013 SN - 0143-974X VL - 150 SP - 115 EP - 128 PB - Elsevier Ltd. AN - OPUS4-45813 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -