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München, Germany

Mangerig I.,University of Federal Defense Munich | Burger S.,NKM Noell Special Cranes | Wagner R.,University of Federal Defense Munich | Wurzer O.,WTM ENGINEERS Munich GmbH | Zapfe C.,Dr. Zapfe GmbH
Stahlbau | Year: 2011

Extensive research activities during last years proved concrete dowels as mechanical and economical reasonable alternative solution for shear connections of composite members. Concrete dowels are produced through recesses of various geometries and topologies in webs or flanges of steel profiles, filled with reinforcement and places in concrete chords. A design concept could be developed based on numerous laboratory tests applicable in a range of tested and statistically evaluated dowel sizes and shapes. Supplemental research projects have been established for economical reasons in order to consider optimized dowel shapes supporting automatic laser cut methods that divide standard steel profiles into two profiles without upper flange including concrete dowels in web plates within only one process. Extended design procedures for such specific dowel topologies require further experimental verification. © Ernst & Sohn Verlag fur Architektur und technische Wissenschaften GmbH & Co. KG.


Wurzer O.,WTM ENGINEERS Munich GmbH | Reiter K.,WTM ENGINEERS Munich GmbH | Sodeikat C.,Gehlen Sodeikat GmbH
Bautechnik | Year: 2010

After prestressing and grouting of the internal tendons of the Iller River Bridge at Thanners pronounced longitudinal cracking was observed on the deck soffit of the western superstructure. A comprehensive investigation of the structure found that the tendons or rather the tendon ducts of the bottom slab of the box girder had floated out of place during concreting of the damaged section. Based on non-linear comparative calculations using the finiteelement method it was determined that the damage was relevant with regard to the overall resistance and serviceability of the affected deck which then required complex remedial measures for the bridge. This report provides information on the damage, the investigation, the cause of the damage, the comparative structural analysis as well as the actual repair procedures. © 2010 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH ;& Co. KG, Berlin.

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