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Teworte F.,HP Ingenieure GmbH and Co. KG | Herbrand M.,RWTH Aachen | Hegger J.,RWTH Aachen
Structural Engineering International: Journal of the International Association for Bridge and Structural Engineering (IABSE) | Year: 2015

The demands on the load-carrying capacity of bridges have increased over the last few decades because of the higher traffic volumes and weights. In the future, an even greater increase is expected. Since a large part of the existing bridges in Germany was built in the 1960s and 1970s, the assessment of these structures is deemed crucial. Therefore, the German Ministry of Transport introduced guidelines in 2011 allowing for a more accurate determination of the bearing capacity compared to the current German bridge design code. Nevertheless, many concrete bridges show deficits in shear and fatigue resistance. Consequently, a supplement to the guideline was published in 2015 to incorporate new research results. This paper describes the approaches for static and fatigue shear verification that consider the provided shear reinforcement. These methods refer to a truss model with variable compression strut inclination. Further, an application to a typical box-girder bridge in the road network is presented, demonstrating the potential for increasing the design value of the bearing capacity. Source

Hegger J.,RWTH Aachen | Marzahn G.,Bundesministerium fur Verkehr | Teworte F.,HP Ingenieure GmbH and Co. KG | Herbrand M.,RWTH Aachen
Beton- und Stahlbetonbau | Year: 2015

The structural assessment of existing road bridges that has been recently performed on the basis of the equally named provisions, issued in 2011 by the Federal Ministry of Transport and Urban Affairs, have revealed significant deficits in shear and torsion as well as fatigue resistance especially in prestressed concrete bridges. In a research project, funded by the Federal Highway Research Institute of Germany, design methods have been developed that were incorporated into the first addendum of the Structural Assessment Provisions. This paper describes the respective design methods for shear under static and cyclic loading without shear reinforcement. The procedures take into account current research results as well as the design codes for concrete bridges and are based on a verification of the principal tensile stresses. The use of the procedure and the main results are shown exemplarily by a design example of a typical box girder bridge of the German road network. © Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG. Source

Ricker M.,Halfen GmbH | Siburg C.,HP Ingenieure GmbH and Co. KG
Beton- und Stahlbetonbau | Year: 2014

Model Code 2010 introduces a new design concept for punching shear, which bases on the so-called Critical Shear Crack Theory. In this paper, the design provisions for punching shear according to Model Code 2010, Eurocode 2 and the corr - esponding German National Annex to Eurocode 2 are presented and background information is given. By means of parameter studies and a comparison of the calculated resistances to test result, the different punching shear design provisions are critically reviewed. The safety levels of the code provisions are verified and the influence of the different punching parameters on the calculated resistances is examined in detail. © Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin. Source

Hegger J.,RWTH Aachen | Goralski C.,HP Ingenieure GmbH and Co. KG | Kulas C.,RWTH Aachen
Beton- und Stahlbetonbau | Year: 2011

A Pedestrian Bridge Made of Textile Reinforced Concrete The pedestrian bridge over a state road in Albstadt, Germany, had to be torn down due to immense corrosion damages of the steel reinforcement and was replaced by a new bridge. The design of the new bridge allows a slender and durable construction with high demands on the concrete surface. The bridge with a total length of 97 m is subdivided in six prefabricated parts with a maximum element length of 17,2 m and a span of Ls = 15 m. The height of only 43 cm is possible by using the innovative composite material textile reinforced concrete. Thus, a slenderness of Ls/H = 35 and an extreme slender bridge construction is achieved. Due to the non-corrosive textile reinforcement a very small concrete cover is possible and, thus, webs and cantilever arms can be designed very thin. The paper describes the construction, design and dynamic behaviour. A report on materials, load bearing behaviour and on the durability is available as a separate paper in this issue. © 2011 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin. Source

Heidolf T.,Halfen GmbH | Roeser W.,HP Ingenieure GmbH and Co. KG
Beton- und Stahlbetonbau | Year: 2011

The secure connection between steel components and reinforced concrete structures is important in general, especially in precast construction as well as in civil engineering. Due to the technical approval for innovative HSC-B concrete steel connection, it is now possible to transfer high loads in hybrid structures with screwed connection. The specific material properties of steel and reinforced concrete are used optimally. In this paper the results of approval tests and the derived design method for the concrete steel connection are presented. The design concept is based on experimental results and is part of National Technical Approval Z-15.6-284. Copyright © 2011 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin. Source

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