@book{NitschkePagelKlassenPasternaketal., author = {Nitschke-Pagel, Thomas and Klassen, Jakob and Pasternak, Hartmut and Launert, Benjamin and Krausche, Thomas}, title = {P 858 - Schweißen dicker Bleche unter Baustellenbedingungen - Beurteilung des Einflusses auf das Tragverhalten von Montagest{\"o}ßen}, publisher = {Verlag und Vertriebsgesellschaft mbH}, address = {D{\"u}sseldorf}, isbn = {978-3-942541-69-5}, abstract = {Beim Aufbau großer Stahlstrukturen im Br{\"u}cken- oder Stahlhochbau wird heute vermehrt auf modulare Fabrikfertigung gesetzt. Ein F{\"u}gen dieser Module auf der Baustelle zu einer Gesamtstruktur ist aber weiterhin notwendig. Als F{\"u}geverfahren wird hier h{\"a}ufig das MAG-Mehrlagenschweißen eingesetzt. Gerade an dicken Blechen stellen Baustellenschweißungen nicht nur besondere Anforderungen an den ausf{\"u}hrenden Betrieb, die Bauleitung und Bau{\"u}berwachung, sondern auch an den Konstrukteur. Wichtig f{\"u}r den Konstrukteur ist die Kenntnis der sich durch Schweißungen einstellenden Schrumpfung der Bauteile, der auftretenden Verz{\"u}ge und Eigenspannungen. Gerade bei Baustellenschweißungen m{\"u}ssen diese Aspekte in der Konstruktionsphase der Einzelkomponenten mit ber{\"u}cksichtigt werden, um die erforderlichen Toleranzen bei der Montage einzuhalten. Eine genaue Kenntnis der durch Schweißungen verursachten Ph{\"a}nomene ist in den Konstruktions- und Montagebetrieben oft nur aus mehrj{\"a}hrigen Erfahrungen vorhanden. Ein grundlegendes, vollst{\"a}ndiges Bild der Abl{\"a}ufe beim Schweißen auf der Baustelle, das es erm{\"o}glicht, dieses Wissen auf neue Konstruktionen zu {\"u}bertragen, fehlt bisher. Insbesondere f{\"u}r die immer {\"o}fter im Br{\"u}cken- und Stahlhochbau eingesetzten h{\"o}herfesten Feinkornbaust{\"a}hle (z.B. S460) ist die Kenntnis des Verhaltens bei Baustellenschweißungen notwendig. Hier setzt der Forschungsantrag an. Mit Hilfe der Schweißsimulation k{\"o}nnen die Auswirkungen von Schweißn{\"a}hten, wie die Entstehung von Verz{\"u}gen und Eigenspannungen am Bauteil, global dargestellt werden. Eine anschließende Struktursimulationen (Festigkeits- und Steifigkeitsberechnungen) mit aus der Schweißsimulation integrierten Ergebnissen bildet die Basis f{\"u}r erg{\"a}nzende Untersuchungen. Montagest{\"o}ße sind außerdem durch Verschmutzung und Witterung negativ beeinflusst. Die Montage kann beispielsweise bei niedrigen Temperaturen unterhalb des Gefrierpunkts durchgef{\"u}hrt werden m{\"u}ssen. Diese Situation wurde in einer Klimakammer simuliert und die Auswirkungen der Umgebungstemperatur bei der Montage auf das Tragverhalten der Verbindung untersucht. F{\"u}r die im Rahmen des Vorhabens untersuchten F{\"a}lle ist kein Einfluss variierender Umgebungstemperaturen bis -10 °C auf die resultierenden Schweißeigenspannungen festzustellen. Der Vergleich von Verzug und Eigenspannung gegen{\"u}ber normativ vorgegeben Toleranzwerten sowie vereinfachten Ingenieurmodellen f{\"u}r die Approximation des Eigenspannungsverlaufs zeigt große Defizite. Bei realit{\"a}tsnaher Implementierung der Eigenspannungen in die Traglastberechnung k{\"o}nnen z.T. große Reserven im Rahmen der nichtlinearen Traglastberechnung ausgenutzt werden.}, language = {de} } @misc{PasternakKrauscheLaunert, author = {Pasternak, Hartmut and Krausche, Thomas and Launert, Benjamin}, title = {Schweißen von Tr{\"a}gern mit dicken Blechen, Teil 2: Schweißen unter Baustellenbedingungen - Montagestoß und Variation der Umgebungstemperatur}, series = {Bauingenieur}, volume = {89}, journal = {Bauingenieur}, number = {12}, issn = {0005-6650}, pages = {537 -- 547}, language = {de} } @misc{PasternakKrauscheLaunert, author = {Pasternak, Hartmut and Krausche, Thomas and Launert, Benjamin}, title = {Schweißen von Tr{\"a}gern mit dicken Blechen, Teil 1: Tr{\"a}gerfertigung unter Werksbedingungen - Planung, Herstellung und Simulation}, series = {Bauingenieur}, volume = {89}, journal = {Bauingenieur}, number = {10}, issn = {1436-4867}, pages = {395 -- 404}, language = {de} } @misc{PasternakKrauscheNiemann, author = {Pasternak, Hartmut and Krausche, Thomas and Niemann, M.}, title = {Umbau eines Schulgeb{\"a}udes der Heinrich-Nordhoff-Gesamtschule in Wolfsburg}, series = {Bauingenieur}, volume = {89}, journal = {Bauingenieur}, number = {4}, issn = {1436-4867}, pages = {182 -- 185}, language = {de} } @inproceedings{KrauscheLaunert, author = {Krausche, Thomas and Launert, Benjamin}, title = {Schweißen dicker Bleche unter Baustellenbedingungen}, series = {BTU Stahlbau-Symposium 2014, Cottbus, 2014}, booktitle = {BTU Stahlbau-Symposium 2014, Cottbus, 2014}, publisher = {BTU}, address = {Cottbus [u.a.]}, pages = {17 -- 24}, language = {de} } @misc{PasternakLaunertKrausche, author = {Pasternak, Hartmut and Launert, Benjamin and Krausche, Thomas}, title = {Welding of girders with thick plates — Fabrication, measurement and simulation}, series = {Journal of Constructional Steel Research}, volume = {Vol. 115}, journal = {Journal of Constructional Steel Research}, issn = {0143-974X}, doi = {10.1016/j.jcsr.2015.08.037}, pages = {407 -- 416}, abstract = {This article presents experimental and numerical results of the fabrication of welded plate girders under workshop conditions. Main concerns are the prediction of imperfections with the aid of simulation tools and/or simplified engineering models. Their impact on the component design is evaluated in a case study. Special focus is put on the effect of residual welding stress. For this, different simplified distributions are compared with results from welding simulation. The findings confirm the thesis that present recommendations on the implementation of weld-induced imperfections must be rated conservative. This suggests that it is necessary to establish new models. Guidance on future problems in this context will be given.}, language = {en} } @misc{FuegKrauscheWebneretal., author = {F{\"u}g, Dieter and Krausche, Thomas and Webner, Michael and Klenner, Frank}, title = {Besonderheiten der Berechnung und konstruktiven Gestaltung von Kleinwindenergieanlagen nach DIN EN 61400-2:2006}, series = {Bauingenieur}, journal = {Bauingenieur}, number = {8}, issn = {1436-4867}, pages = {342 -- 353}, abstract = {Der steigende Energiebedarf erfordert unter Beachtung des Vorrangs erneuerbarer Energiequellen wie Wind, Wasser und Sonne die Nutzung von Konstruktionsl{\"o}sungen, die die daraus resultierende Aufgabe der Energiegewinnung wirtschaftlich umzusetzen. Im vorliegenden Beitrag wird eine L{\"o}sung beschrieben, die helfen soll, die Windenergie zur Stromerzeugung in schlecht zug{\"a}nglichen Gebieten, an Standorten mit großer Entfernung zu anderen Anlagen der Stromgewinnung oder in Gegenden f{\"u}r kleine Wohn- oder Industriebauten, wo die Wirtschaftlichkeit nachgewiesen werden kann, zu nutzen. Auch die Stromerzeugung f{\"u}r Baustellenbetrieb ist denkbar. Hierf{\"u}r k{\"o}nnen Kleinwindenergieanlagen (KWEA) eine Alternative zur Stromerzeugung sein. Der vorliegende Beitrag beinhaltet Vorschl{\"a}ge zur konstruktiven Gestaltung, Besonderheiten der Berechnung und ein Beispiel f{\"u}r die Ausf{\"u}hrung der Tragstruktur von KWEA. Grundlage f{\"u}r die Berechnung und Ausf{\"u}hrung ist die DIN EN 61400-2:2006, deren Besonderheiten mit diesem Beitrag demonstriert werden.}, language = {de} } @misc{PasternakKrausche, author = {Pasternak, Hartmut and Krausche, Thomas}, title = {The Porsche Pavilion in the Autostadt Wolfsburg, Germany}, series = {Procedia Engineering}, journal = {Procedia Engineering}, number = {57}, issn = {1877-7058}, doi = {10.1016/j.proeng.2013.04.010}, pages = {63 -- 69}, language = {en} } @inproceedings{PasternakKrausche, author = {Pasternak, Hartmut and Krausche, Thomas}, title = {Design, constructions and assembly of two membrane-cladded double-curved cable net roofs}, series = {6th Structural Engineers World Congress (SEWC 2017), Cancun/Mexico}, booktitle = {6th Structural Engineers World Congress (SEWC 2017), Cancun/Mexico}, publisher = {Universidad Nacional Aut{\´o}noma de M{\´e}xico - UNAM}, pages = {8}, abstract = {For stadium roofs light weight constructions, that are tensioned between a cantilevering steel compression ring, are commonly build around the globe, mostly for social events like sport games and concerts. They allow having no columns in the viewing area and also spanning the whole arena. With the additional use of membranes as the roof shell, the inside of the building will get naturally lighted. With the knowledge of the occurring loads, an economic structure can be found to optimize the edge structure. Frequently the form finding process will use the death loads as decisive action because for only one load case a moment free form can be determined. Other load cases will cause bending in the girder. The process also allows having only supports at the low points and a cantilever arises. These types of roofs will be compared with two exemplary canopies in Germany. The main focus will be on the assembly of the edge girder, which will evoke challenges for planning as well as the actual manufacturing process. The steel edge girder is double curved and has a spatially shape. The welded box exists of 4 to 5 curving plates that have thicknesses from 15mm to 55mm and will vary in their height. Due to welding residual stresses occur during the assembly in the factory as well as on the construction side. For the design of the girders, the residual stresses need to be determined. The identified results of the residual stresses will vary through the plate thickness and will differ for residual longitudinal and residual transverse stresses. The longitudinal residual stresses, as the relevant residual stresses for axial forces, will be farther scrutinized. Due to its complex geometry the challenges of the simulation will be presented for the manufacturing process and the construction site assembly. For the farther investigation the calculated stresses will be taken for a load capacity calculation of a section of the edge girder. Due to the forming geometry and the welding process, both effects need to be considered. This calculation will also show that the edge girder needs to be stiffened in the inside with bulkhead plate's und longitudinal stiffeners. Both authors are involved in the verification of the objects (Customer Centre in the Autostadt Wolfsburg-CC, Schierke-Arena -FA in the Harz Mountains) mentioned below.}, language = {en} } @inproceedings{KrauscheLaunertPasternak, author = {Krausche, Thomas and Launert, Benjamin and Pasternak, Hartmut}, title = {Welding effects in unregularly steel box girders}, series = {6th Structural Engineers World Congress (SEWC 2017), Cancun/Mexico}, booktitle = {6th Structural Engineers World Congress (SEWC 2017), Cancun/Mexico}, publisher = {Universidad Nacional Aut{\´o}noma de M{\´e}xico - UNAM}, pages = {6}, abstract = {Several approaches on geometrical and structural imperfections are given in the literature for I sections and rectangular box girders. Those approximations of the residuals stress state can be implemented into the structural analysis using multi-purpose FEM program packages. The knowledge of the stress state of free forming cross sections has still to be determined. To fulfil a safe design, the assumptions mostly will be very conservative due to the lack of the assumed stress state. This will result directly to increased thicknesses or additional stiffening of the plates. Not only the material cost will rise, but also the fabrication costs like welding will be affected. This paper aims to provide an overview on the possibilities in the numerical prediction of weld residual stresses and weld induced deformations for cross sections with unique shapes. With the obtained values the tendencies of the residual stress state and deformations will be used to optimize the design. A representative example on a section used in a steel compression ring of a realized roof is described and analyzed using a simplification of a numerical welding simulation. The reduced simulation of the originally transient weld procedure was held to a practically reasonable level and can be reproduced for similar problems. The calculations used the Abaqus Welding Interface (AWI) to automate working steps in conjunction with the definition of weld passes and their sequencing. The field of the method that is discussed also a need of further investigations to prove its applicability. Some experimental back up is requires to verify the result quality. Nonetheless, this method could already help to show up tendencies or to identify potential critical spots in the design.}, language = {en} } @misc{KrauscheLaunertPasternak, author = {Krausche, Thomas and Launert, Benjamin and Pasternak, Hartmut}, title = {A study on the prediction of welding effects in steel box girders}, series = {Ce/papers}, volume = {1}, journal = {Ce/papers}, number = {2-3}, issn = {2509-7075}, doi = {10.1002/cepa.500}, pages = {4410 -- 4416}, abstract = {For standard sections including I-girders and rectangular box girders, several approaches on geometrical and structural imperfections are given in the literature, which can be implemented in a numerical analysis. For complex sections, as found in many of today's lightweight roof structures, these assumptions are conservative due to the sections typically unique shape, which leads to increased thicknesses or additional stiffening of the plates. This, on the other hand, can significantly affect fabrication costs. This paper aims to provide an overview on the possibilities in the numerical prediction of weld residual stresses and weld-induced deformations for these sections. The obtained values can be used in a subsequent numerical analysis to understand the structural behavior and optimize the design. A representative example on a section used in a steel compression ring is described and analyzed using the numerical welding simulation. A simplification of the originally transient weld procedure is used in order to reduce computation times to a practically reasonable level. In this context, the Abaqus Welding Interface (AWI) helps to automate working steps in conjunction with the definition of weld passes and their sequencing, which shall be shown in here. The applicability of this method is discussed showing also a need of further investigations in this field. This is especially with regard to result quality, which requires some experimental back-up. Nonetheless, this method could already help to show up tendencies or to identify potential critical spots in the design.}, language = {en} } @inproceedings{RagotzkyLaunertKrausche, author = {Ragotzky, Birgit and Launert, Benjamin and Krausche, Thomas}, title = {Welding simulation for the calculation of the welding residual stresses in welded I-girders}, series = {Proceedings of the METNET Seminar 2017 in Cottbus}, booktitle = {Proceedings of the METNET Seminar 2017 in Cottbus}, editor = {Virdi, Kuldeep and Tenhunen, Lauri}, publisher = {H{\"a}me University of Applied Sciences (HAMK)}, address = {H{\"a}meenlinna, Finland}, isbn = {978-951-784-794-0}, pages = {56 -- 68}, language = {en} } @inproceedings{PasternakKrausche, author = {Pasternak, Hartmut and Krausche, Thomas}, title = {A special Construction Site: the Guyed Mast at Torfhaus in the Harz Mountains, Germany}, series = {Risk and Safety Engineering, 12th International Conference, Kopaonik, 2017}, booktitle = {Risk and Safety Engineering, 12th International Conference, Kopaonik, 2017}, publisher = {The Higher Education Technical School of Professional Studies}, address = {Novi Sad}, isbn = {978-86-6211-107-4}, pages = {540 -- 545}, language = {en} } @inproceedings{PasternakKrausche, author = {Pasternak, Hartmut and Krausche, Thomas}, title = {Details of the steel assembly of a membrane-cladded double ­ curved cable net roof}, series = {ICCAEE 2016 Kuala Lumpur/Malaysia, 2nd International Congress on Technology - Engineering \& Science}, booktitle = {ICCAEE 2016 Kuala Lumpur/Malaysia, 2nd International Congress on Technology - Engineering \& Science}, publisher = {University of Malaysia}, address = {Pahang}, language = {en} } @inproceedings{PasternakKrauscheLaunert, author = {Pasternak, Hartmut and Krausche, Thomas and Launert, Benjamin}, title = {Welded construction site joints in bridges}, series = {Steel Bridges: Innovation \& New Challenges, 8th International Symposium on Steel Bridges, Istanbul, 2015}, booktitle = {Steel Bridges: Innovation \& New Challenges, 8th International Symposium on Steel Bridges, Istanbul, 2015}, publisher = {Turkish Constructional Steelwork Association (TUCSA)}, address = {Istanbul, Turkey}, isbn = {978-605-65900-2-3}, pages = {315 -- 320}, abstract = {In large steel construction, as in steel bridges, construction site welds are made under difficult conditions such as low temperatures and wind. The comprehensive study will show not only test results from the analysis in the climate chamber (large scale test) with low temperatures (-20°C, -10°C) as well as numerical calculations with the help of welding simulation and non-linear structural analysis. Deflections and temperature are given and compared with traditional engineering models and advises for future problems are presented. For bridge girders with I cross sections, welded thick plates are used and there joining need to be considered precisely. Effect from welding, such as deflections and residual stresses, will have an outcome on the performed component. For welding of thick plates multi-layer welding is used. The edges need to be cut before welding. The preparation process needs to be considered as well as actual joining to have an economic performance. As joint geometry the Z-joint was chosen and investigated. Results from testing as well as from the welding simulation will be shown and compared. Thereby an engineering model will be consulted to evaluate the results. To evaluate the impact of the welding process a FEM load capacity calculation was performed and will be compared with test without imperfections from the joining process.}, language = {en} } @inproceedings{PasternakKrausche, author = {Pasternak, Hartmut and Krausche, Thomas}, title = {The Porsche Pavilion in the Autostadt Wolfsburg, Germany}, series = {13th International Scientific Conference VSU 2013, Sofia, vol. 2}, booktitle = {13th International Scientific Conference VSU 2013, Sofia, vol. 2}, pages = {1 -- 6}, language = {en} } @inproceedings{PasternakKrauscheLaunert, author = {Pasternak, Hartmut and Krausche, Thomas and Launert, Benjamin}, title = {Welding of thick steel plates under site conditions}, series = {7th European Conference on Steel and Composite Structures, Eurosteel, Neapel, 2014}, booktitle = {7th European Conference on Steel and Composite Structures, Eurosteel, Neapel, 2014}, publisher = {ECCS European Convention for Constructional Steelwork}, address = {Brussels}, isbn = {978-92-9147-121-8}, pages = {109 -- 110}, language = {en} } @inproceedings{PasternakMoradiKrausche, author = {Pasternak, Hartmut and Moradi, Milad and Krausche, Thomas}, title = {Reconstruction of a school building in Wolfsburg, Germany}, series = {Tubular Structures XV, Proceedings of the 15th International Symposium on Tubular Structures, Rio de Janeiro, Brazil, 27-29 May 2015}, booktitle = {Tubular Structures XV, Proceedings of the 15th International Symposium on Tubular Structures, Rio de Janeiro, Brazil, 27-29 May 2015}, publisher = {CRC Press}, address = {Hoboken}, isbn = {978-1-138-02837-1}, pages = {31 -- 35}, language = {en} } @misc{ZebingerGieratPasternaketal., author = {Zebinger, Markus and Gierat, Marek and Pasternak, Hartmut and Krausche, Thomas}, title = {Das Seilnetzdach der Schierker Feuerstein Arena im Harz Teil 2: Herstellung, Montage und Schweißsimulation}, series = {Bauingenieur}, volume = {93}, journal = {Bauingenieur}, number = {10}, issn = {0005-6650}, pages = {383 -- 391}, abstract = {Die Stadt Wernigerode in Sachsen-Anhalt errichtete im Ortsteil Schierke eine Multifunktionsarena. Am Fuße des Brockens, dem h{\"o}chsten Berg des Harzes und ganz Norddeutschlands gelegen, f{\"u}gt sich die offene {\"U}berdachung in die vorhandene Topologie nahtlos ein. Das unter Denkmalschutz stehende Natureisstadion, mit seinen bestehenden Natursteinterrassen und einem Schiedsrichterturm aus Holz, wurde baulich so konzipiert, dass die Arena in den Wintermonaten als {\"u}berdachte Kunsteisbahn und im Sommer als Fl{\"a}che f{\"u}r Konzerte, Auff{\"u}hrungen und Sportveranstaltungen genutzt werden kann. Eine ganz besondere Herausforderung war die Herstellung und Montage des circa 190m langen geschweißten Stahlrandtr{\"a}gers. Der Hohlkasten besteht aus vier doppelt gekr{\"u}mmten Blechen und lagert an lediglich zwei Fußpunkten auf. Der zweite Teil des Beitrags befasst sich mit Schweißeigenspannungen an einem ausgew{\"a}hlten Querschnitt der {\"U}berdachung.}, language = {de} } @inproceedings{PasternakKrauscheLaunert, author = {Pasternak, Hartmut and Krausche, Thomas and Launert, Benjamin}, title = {Welding of Thick Plates under Site Conditions - Evaluation of the Influence on the Structure Behaviour of Welded Assembly Joints}, series = {Design, fabrication and economy of metal structures, international conference proceedings 2013, Miskolc, Hungary, April 24 - 26, 2013}, booktitle = {Design, fabrication and economy of metal structures, international conference proceedings 2013, Miskolc, Hungary, April 24 - 26, 2013}, publisher = {Springer}, address = {Heidelberg}, isbn = {978-3-642-36690-1}, pages = {455 -- 460}, language = {en} } @inproceedings{BachmannKrauscheLaunertetal., author = {Bachmann, Volkmar and Krausche, Thomas and Launert, Benjamin and Klassen, Jakob}, title = {Schweißen dicker Bleche unter Baustellenbedingungen}, series = {18. DASt-Kolloquium, Aachen, 2012}, booktitle = {18. DASt-Kolloquium, Aachen, 2012}, publisher = {Frehner Consulting}, address = {F{\"u}ssen}, isbn = {978-3-929371-26-0}, pages = {113 -- 118}, language = {de} } @misc{WangEulerPasternaketal., author = {Wang, Jian and Euler, Mathias and Pasternak, Hartmut and Li, Zheng and Krausche, Thomas and Launert, Benjamin}, title = {Bending capacity of single and double-sided welded I-section girders: Part 1: Experimental investigations}, series = {Current Perspectives and New Directions in Mechanics, Modelling and Design of Structural Systems : Proceedings of The Eighth International Conference on Structural Engineering, Mechanics and Computation, 5-7 September 2022, Cape Town, South Africa}, journal = {Current Perspectives and New Directions in Mechanics, Modelling and Design of Structural Systems : Proceedings of The Eighth International Conference on Structural Engineering, Mechanics and Computation, 5-7 September 2022, Cape Town, South Africa}, publisher = {CRC Press}, address = {Boca Raton}, isbn = {978-1-00-334845-0}, doi = {10.1201/9781003348443-159}, pages = {975 -- 980}, abstract = {The lateral-torsional buckling resistance of welded steel girders is affected by their residual stresses and geo-metric imperfections. Generally, both influences are mainly controlled by the manufacturing process, in partic-ular the welding of the girder. This paper presents experimental investigations on four laterally unbraced welded steel girders with thin-walled I-sections, whose flange-to-web junctions are welded from one or two sides to evaluate the fabrication influence. The investigations include lateral-torsional buckling tests under combined bending and torsion loading caused by three-point bending due to an eccentric vertical single force. The geometric imperfections of the welded test girders are determined by 3D laser scanning. The test results show that the influence of the geometric imperfections and the residual stresses on the lateral-torsional buck-ling resistance is limited for the tested girders.}, language = {en} } @misc{PasternakKrausche, author = {Pasternak, Hartmut and Krausche, Thomas}, title = {Design, Construction and Assembly of two Membrane-Cladded Double-Curved Net Roofs}, series = {7th International Conference Civil Engineering - Science and Practice (GNP), Kolašin, 10-14 March 2020, Book of abstracts}, journal = {7th International Conference Civil Engineering - Science and Practice (GNP), Kolašin, 10-14 March 2020, Book of abstracts}, pages = {8}, language = {en} } @misc{PasternakKrausche, author = {Pasternak, Hartmut and Krausche, Thomas}, title = {Details and assembly of two cladded double curved cable net roofs}, series = {Advances in engineering materials, structures and systems : innovations, mechanics and applications : proceedings of the 7th International Conference on Structural Engineering, Mechanics, and Computation (SEMC 2019), September 2-4, 2019, Cape Town, South Africa}, journal = {Advances in engineering materials, structures and systems : innovations, mechanics and applications : proceedings of the 7th International Conference on Structural Engineering, Mechanics, and Computation (SEMC 2019), September 2-4, 2019, Cape Town, South Africa}, editor = {Zingoni, Alphose}, publisher = {Taylor \& Francis Group}, address = {London}, isbn = {978-1-138-38696-9}, pages = {896 -- 901}, language = {en} }