Indexing
All Issues
Submission
Author Guidelines
Reviewers
Editorial Members
Publication Fee
Vol.6 , No. 2, Publication Date: Aug. 25, 2020, Page: 9-19
&description=Recently, an adjustment of the German national annex of Eurocode 2-1-1 (general rules for design and buildings) has been published, which concerns, amongst others, the assumption of the effective concrete tensile strength for design of the minimum reinforcement for crack control due to early cracking. Cause for this adjustment has been a change in cement composition, in order to reduce CO<sub>2</sub> emissions. The calculation of the minimum reinforcement for crack control has been controversial in Germany since the 1980s and is subject of research and development ever since. Especially, in the particular case of thick and restrained structural members, which frequently occur in traffic infrastructure or hydraulic-related constructions, very large reinforcement quantities result. These large reinforcement quantities endanger the cost-effectiveness of the construction design and the installation feasibility of the reinforcement on the construction site. In addition, these dimensioning results frequently do not correspond to experience of the construction involved persons. The following article gives background information on the topic of design for crack control due to early cracking and explains the reasons for this adjustment. Furthermore, main differences concerning crack control between the general design of buildings and bridge design are being outlined in order to explain why the adjustment of the national annex has not been made for bridge design (Eurocode 2-2).&picture=http://www.aascit.org/aascit/decorators/img/journal/920.jpg)
| [1] | Karlheinz Haveresch, Department of Straßen, NRW Germany, Hamm, Germany. |
| [2] | Reinhard Maurer, Department of Concrete Structures, TU Dortmund University, Dortmund, Germany. |
| [3] | Franka Tauscher, Department B1, Federal Institution for Road Systems (BASt), Bergisch Gladbach, Germany. |
| [4] | Eva Stakalies, Department of Concrete Structures, TU Dortmund University, Dortmund, Germany. |
Recently, an adjustment of the German national annex of Eurocode 2-1-1 (general rules for design and buildings) has been published, which concerns, amongst others, the assumption of the effective concrete tensile strength for design of the minimum reinforcement for crack control due to early cracking. Cause for this adjustment has been a change in cement composition, in order to reduce CO2 emissions. The calculation of the minimum reinforcement for crack control has been controversial in Germany since the 1980s and is subject of research and development ever since. Especially, in the particular case of thick and restrained structural members, which frequently occur in traffic infrastructure or hydraulic-related constructions, very large reinforcement quantities result. These large reinforcement quantities endanger the cost-effectiveness of the construction design and the installation feasibility of the reinforcement on the construction site. In addition, these dimensioning results frequently do not correspond to experience of the construction involved persons. The following article gives background information on the topic of design for crack control due to early cracking and explains the reasons for this adjustment. Furthermore, main differences concerning crack control between the general design of buildings and bridge design are being outlined in order to explain why the adjustment of the national annex has not been made for bridge design (Eurocode 2-2).
Keywords
Design of Concrete Structures, Early Restraint, Hydration Heat, Crack Control, Effective Concrete Tensile Strength
Reference
| [01] | Deutscher Beton- und Bautechnik-Verein: DBV-Merkblatt, Begrenzung der Rissbreiten im Stahlbeton- und Spannbetonbau, Fassung Mai 2016. |
| [02] | DIN EN 1992-2: Eurocode 2-2: Bemessung und Konstruktion von Stahlbeton- und Spannbetontragwerken – Teil 2: Betonbrücken |
| [03] | DIN EN 1992-2/NA:2013: Bemessung und Konstruktion von Stahlbeton- und Spannbetontragwerken – Teil 2: Betonbrücken – Bemessungs- und Konstruktionsregeln mit zugehörigem nationalen Anhang, Deutsche Fassung, Ausgabe April 2013. |
| [04] | Maurer, R.; Tue, N. V.; Haveresch, K.-H; Arnold, A.: Mindestbewehrung zur Begrenzung der Rissbreiten bei dicken Wänden. Bauingenieur 80 (2005), Heft 10, S. 479-485. |
| [05] | Bundesanstalt für Straßenwesen: Richtzeichnungen für Ingenieurbauten (RiZ-ING), zum Download unter www.bast.de “Regelwerke Brücken- und Ingenieurbau”. |
| [06] | Bundesministerium für Verkehr: Ergänzende Bestimmungen für die Anwendung der DIN 1045, ARS 12/1989. |
| [07] | Bundesministerium für Verkehr, Abteilung Straßenbau: Zusätzliche Technische Vertragsbedingungen für Kunstbauten ZTV-K, Ausgabe 1996, Verkehrsblattverlag Dortmund. |
| [08] | König, G., Tue, N. V.: Grundlagen und Bemessungshilfen für die Rissbreitenbeschränkung im Stahlbeton- und Spannbetonbau. Deutscher Ausschuss für Stahlbeton, Heft 466, Beuth, Berlin 1996. |
| [09] | DIN 1045-1: 2002-07 – Tragwerke aus Stahlbeton und Spannbeton – Teil 1: Bemessung und Konstruktion |
| [10] | DIN Fachbericht 102:2009-03: DIN Fachbericht 102 – Betonbrücken, Beuth, Berlin (2009). |
| [11] | Verein Deutscher Zementwerke e. V. (VDZ): Zahlen und Daten. Zementindustrie in Deutschland 2014 und Zementindustrie Deutschland 2015. Zu bestellen unter www.vdz-online.de “Publikationen”. |
| [12] | Bundesanstalt für Straßenwesen (BASt): Zusätzliche Technische Vertragsbedingungen und Richtlinien für Ingenieurbauten ZTV-ING, zum Download unter www.bast.de “Regelwerke Brücken- und Ingenieurbau”. |
| [13] | Fingerloos, F., Hegger, J.: Erläuterungen zur Änderung des deutschen Nationalen Anhangs zu Eurocode 2 (DIN EN 1992-1-1/NA/A1:2015-12). Beton- und Stahlbetonbau 111 (2016), Heft 1. |
