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Kueres D.,RWTH Aachen | Siburg C.,HP Ingenieure GmbH and Co. KG | Herbrand M.,RWTH Aachen | Classen M.,RWTH Aachen | Hegger J.,RWTH Aachen
Engineering Structures | Year: 2017

The punching shear design of flat slabs and column bases was revised with the introduction of Eurocode 2. While in many former codes the punching shear resistance was determined regardless of the type of member, in Eurocode 2 two different design equations for flat slabs and column bases were introduced. Additionally, different control sections for flat slabs and column bases were defined. The differentiation between flat slabs and column bases and especially the iterative design procedure for the determination of the punching shear resistance of column bases require great effort in daily practice. Based on the punching shear provisions according to Eurocode 2, a new Uniform Design Method (UDM) for flat slabs and column bases is developed. The derivation of the design method is described in detail. To verify the changes in the current design provisions, the new design method is evaluated using large databanks for flat slabs and column bases without and with shear reinforcement as well as systematic test series. © 2017 Elsevier Ltd


Ricker M.,Biberach University of Applied Sciences | Siburg C.,HP Ingenieure GmbH and Co. KG
Structural Concrete | Year: 2016

The fib Model Code for Concrete Structures 2010 introduces a new design concept for punching shear based on critical shear crack theory. This paper presents and provides the background to the design provisions for punching shear according to fib Model Code 2010, Eurocode 2 and the corresponding German National Annex to Eurocode 2. The different punching shear design provisions are critically reviewed by means of parameter studies and a comparison of the calculated resistances and test results. 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. Copyright © 2016 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin


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.


Kerkeni N.,HP Ingenieure GmbH and Co. KG | Roeser W.,HP Ingenieure GmbH and Co. KG
Beton- und Stahlbetonbau | Year: 2014

The Chio-bridge in Aachen is an integral pedestrian bridge with an S-shaped floor plan. It is a cable stayed bridge with a 65 m high pylon. This paper describes the design and the building process. © Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin.


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.


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.


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.


The shear resistance of hollow core slabs is considerably reduced when the slabs are bedded on flexible supports like slender beams or girders instead of rigid walls. So far, there is no standardised design concept to determine the residual bearing capacity appropriately. This paper describes the derivation of a design model to determine the shear resistance of precast prestressed hollow core slabs on flexible supports. Copyright © 2011 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin.


When it comes to the verification of characteristic sections in the structures for wind turbine generators under cyclic loading, various questions are known in the current design practice. Thus, the German building authorities "Deutsches Institut für Bautechnik (DIBt)" commissioned the status report "Concrete fatigue behaviour under cyclic loading from the operation of wind turbine generators" [1]. The intention of the investigations was to establish an objective criterion for the assessment of current design principles for cyclic loading from the operation of wind turbine generators. For this purpose, theoretical and experimental examinations providing a basis for the present approaches in existing codes and regulations were assembled and evaluated. In addition, advanced design approaches from literature were summarised and compared. Following this, comparative calculations concerning the resistance against concrete fatigue for typical impacts from wind turbine generators were performed. Based on these examinations and in consideration of the particular loading scenarios of structures for wind turbine generators, the need for further research was identified and recommendations for theoretical and experimental investigations were developed. The investigations and significant results are summarised in the present report. © Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin.


Siburg C.,HP Ingenieure GmbH and Co. KG | Ricker M.,Halfen GmbH | Hegger J.,RWTH Aachen
Structural Concrete | Year: 2014

Eurocode 2 and the corresponding National Annex were introduced in Germany in 2012. Most of the design provisions for these new standards were adopted from Model Code 1990 and provide a new design approach for ground slabs and footings. For the fib Model Code for Concrete Structures 2010, the punching shear design concept has been revised and introduced in Swiss standard SIA262:2013. This paper presents in detail the design equations for determining the punching capacity according to Eurocode 2, the German National Annex to Eurocode 2, fib Model Code 2010 and SIA 262:2013. Parametric studies have been used to examine the influence of the main parameters (shear span-depth ratio, effective depth, longitudinal reinforcement ratio and concrete compressive strength) on the punching shear resistance of footings. To quantify the level of safety and the efficiency, the design provisions are compared with systematic test series. Copyright © 2014 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin.

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