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Author(s):	Hegger, Josef; Schmidt, Maximilian; Adam, Viviane
Title:
Abstract:	Herrn Univ.-Prof. Dr.-Ing. habil. Nguyen Viet Tue zur Vollendung seines 65. Lebensjahrs gewidmet Die ungünstige Altersstruktur der Bundesfernstraßen in Deutschland und die erhebliche Zunahme des Güterverkehrs sind die wesentlichen Gründe für den allgemein schlechten Gesamtzustand zahlreicher Brückenbauwerke. Zusätzlich ergeben sich durch die Weiterentwicklung der Normen in Verbindung mit den Eurocodes häufig rechnerische Defizite. Genauere Nachweisformate bietet die Stufe 2 der Nachrechnungsrichtlinie an, die 2011 erstmals erschienen ist und 2015 ergänzt wurde. Neuere Erkenntnisse zum Querkrafttragverhalten von Spannbetonbrücken mit geringen Querkraftbewehrungsgraden im Bereich von &rgr;w, min bilden die Grundlage für die 2. Ergänzung der Nachrechnungsrichtlinie, die in der BEM-ING Teil 2 erscheinen wird. Zur Bewertung der Querkrafttragfähigkeit des Hauptsystems wird ein erweitertes Fachwerkmodell mit additivem Betontraganteil eingeführt, das im Folgenden erläutert und anhand von zwei Fallbeispielen vorgestellt wird. Shear strength assessment of bridge girders using refined design approaches The unfavourable age structure of bridges of the federal highway system in Germany and the considerable increase in goods traffic are the main reasons for the generally poor overall condition of numerous bridge structures. In addition, the further development of the standards in connection with the Eurocodes often results in computational deficits. More precise verification formats are offered by Level 2 of the assessment guideline, which was first published in 2011 and extended in 2015. Recent findings on the shear behaviour of prestressed concrete bridges with low shear reinforcement ratios in the range of &rgr;w, min form the basis for the 2nd extension to the assessment guideline, which will appear in BEM-ING Part 2. For the evaluation of the shear capacity of the main system, an extended truss model with additive concrete contribution is introduced, which is explained in the following and presented by means of two case studies.
Source:	Beton- und Stahlbetonbau 117 (2022), No. 9
Page/s:	689-698
Language of Publication:	German

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