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Muller A.,BuchtingStreit AG Beratende Ingenieure VBI | Jahring A.,BuchtingStreit AG Beratende Ingenieure VBI | Goj K.,Oberste Baubehorde im Bayerischen Staatsministerium des Inneren | Fischer O.,TU Munich
Beton- und Stahlbetonbau | Year: 2013

In May 2011 the new guideline "Nachrechnungsrichtlinie" (standard for bridge re-analysis and assessment) was recommended for application by the Federal Ministry of Transport, Building and Urban Development. Since then several pilot projects have been launched in Bavaria aiming on the re-analysis of different types of major road bridges based on the assessment guideline. One of these bridges is the BAB A9 Danube PC box girder bridge next to Ingolstadt. Upon completion of the re-analyses according to the so-called levels 1 and 2 of the guideline there were still severe calculatory deficits particularly regarding the connection zones of the compression flanges and webs close to the supports. By using a 3D FE model and physically non-linear analysis methods combined with in-situ investigations (i.e. level 4 of the guideline) it was finally possible to fulfill all design criteria and hence to avoid both traffic restrictions as well as strengthening measures. The present paper describes the general assessment approach and highlights important findings and results of the non-linear analyses. Finally, the Danube Bridge results are discussed with the background of a current research project focusing on a systematic evaluation of available re-analyses of RC/PC bridges performed on the basis of the new assessment guideline. Copyright © 2013 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin. Source


Fischer O.,TU Munich | Muller A.,BuchtingStreit AG Beratende Ingenieure VBI | Lechner T.,TU Munich | Wild M.,TU Munich | Kessner K.,Ingenieurburo Grassl GmbH
Beton- und Stahlbetonbau | Year: 2014

In May 2011 the new guideline "Nachrechnungsrichtlinie" (standard for bridge re-analysis and assessment) was recommended for application in order to implement a harmonized basis for the assessment of existing road bridges. Within the framework of a research project initiated and funded by the Federal Highway Research Institute (BASt) re-analysis results of in total 146 concrete bridges were collected and evaluated. One major goal of this project was to provide a basis for a more efficient re-analysis and an improved documentation of the results. The present paper firstly describes typical "calculatory deficits" requiring additional considerations upon completion of the so-called re-analysis stage 2. Subsequently, general recommendations for future re-analyses are being provided, advices are given in terms of the handling of deficits and a proposal is made and discussed regarding presentation and documentation of re-analysis results. Copyright © 2014 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin. Source

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