Buchting Streit AG

München, Germany

Buchting Streit AG

München, Germany
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Sauer J.,TU Munich | Lingemann J.,BuchtingStreit GmbH | Fischer O.,TU Munich | Zilch K.,TU Munich
3rd International fib Congress and Exhibition, Incorporating the PCI Annual Convention and Bridge Conference: Think Globally, Build Locally, Proceedings | Year: 2010

From literature test data of steel fiber reinforced beams without stirrups were collected. It is differentiated between steel fiber reinforced concrete beams without and with prestressing. From a research project and a literature search test results without steel fibers and without stirrups are consulted. These are compared with steel fiber reinforced concrete beams. Based on the test results the analytical approach according to the new German guideline is evaluated. Test specimens with steel fibers are reaching higher ultimate shear forces than test specimens without steel fibers. The results for calculated shear force are on the safe side. They show potential for optimization of the analytical approach. To analyze this in detail, the main parameters concrete compressive strength, longitudinal reinforcement ratio, effective depth and web width will be analyzed. For prestressed beams just a few test results are available so no real conclusion can be given.

Lingemann J.,BuchtingStreit GmbH | Zilc K.,TU Munich
3rd International fib Congress and Exhibition, Incorporating the PCI Annual Convention and Bridge Conference: Think Globally, Build Locally, Proceedings | Year: 2010

In bending tensile tests on beam specimens made of steel fiber reinforced concrete (SFRC) coefficients of variation (COV) greater than 0.25 are often observed. Contrary to this a much lower scatter is obtained in members with greater size. In the current paper the scatter of the number of fibers in a crack and of the measured post cracking strengths is investigated with respect to the member size. A theoretical model describing the dependence of the scatter on the size is presented. The model is validated by experimental investigations. In combination with the model a safety concept for SFRC is analyzed. The results are compared with the regulations of the German guideline for SFRC1.

Fischer O.,TU Munich | Katz C.,SOFiSTiK AG | Putz A.,Igl | Schneider F.,Johannes Kepler University | And 2 more authors.
Large Structures and Infrastructures for Environmentally Constrained and Urbanised Areas | Year: 2010

The present paper focuses on holistic sustainability evaluations for infrastructure measures and the related engineering structures. Following a brief overview on the current state of development of rating concepts both in the building and infrastructure sector, general options for assessing the overall sustainability are discussed and some major infrastructure-specific characteristics regarding the holistic performance are explained. Since indirect (external) effects often play an important role in the assessment of infrastructure measures, the respective influence on the overall performance and the interrelation between direct and indirect costs are exemplarily discussed by means of three examples (road infrastructure). Hereby, it is shown that the indirect costs easily may reach a level being in the range of the construction costs of the entire project and that an initial additional investment during construction in high-quality structural members and components is being typically paid off by a reduced maintenance effort, even if the external effects are not included.

Baumgartner U.,Dr. Baumgartner GmbH Fuhrungs Instrumente Projektmanagement | Fischer O.,TU Munich | Jungwirth J.,SSF Ingenieure AG | Katz C.,SOFiSTiK AG | And 5 more authors.
Beton- und Stahlbetonbau | Year: 2012

In the following paper basic aspects for a holistic assessment of traffic infrastructure projects are elucidated. Starting with general aspects, specific features and aims, the times and possibilities of a holistic assessment, as well as different aspects of an assessment concerning the placing are explained. In addition, a comparison between existing assessment systems in structural engineering and their boundary conditions is made. An overview of the current research projects follows. Special questions concerning the holistic assessment of traffic infrastructure, e.g. inexactness for a given period, assessment methods for "risks for the local environment", and the holistic public participation, conclude this paper with examples. Copyright © 2012 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin.

If the soil cover above an existing tunnel is significantly reduced due to additional construction measures or if additional large loads are introduced it is often necessary to perform a three dimensional analysis. While modeling soil or rock non linear material laws are typically employed. For economic reasons linear elastic material laws should be applied for the tunnel lining.If a linear analysis in combination with modifications to the existing structure does not provide a sufficient level of safety of the overall system a non-linear analysis approach may be an useful alternative for the design of tunnel linings. Non-linear analysis of tunnel linings is required for unreinforced inner tunnel linings or in cases of significant local removal of the soil cover of existing tunnel structures. For such cases this paper outlines how a non-linear analysis can be structured and how the necessary load increments should be considered in the soil-tunnel FE model to correctly reflect the bearing behavior of the soil. © 2013 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin.

Zinke T.,Karlsruhe Institute of Technology | Schmidt-Thro G.,Buchting Streit AG | Ummenhofer T.,Karlsruhe Institute of Technology
Beton- und Stahlbetonbau | Year: 2012

Infrastructures are characterized by strong interdependencies with the surrounding environment. A bridge for example is always integrated in a network. For a quantification of surrounding effects, the method of external cost calculation is already applied in practice. External effects like air pollution and noise are translated in monetary units. As a result they can directly be used in decision making processes. For an integration of this method in a sustainability assessment system the potentials and problems of the external cost calculation must be considered. This paper aims at providing an argumentation basis and gives recommendations for the design of a sustainability assessment system for transportation infrastructures. Copyright © 2012 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin.

Sonnabend S.,Buchting Streit AG | Franz S.,DEGES Deutsche Einheit Fernstrassenplanungs und bau GmbH | Steinbruck C.,Max Bogl Stiftung and Co. KG | Kerschensteiner M.,Buchting Streit AG
Beton- und Stahlbetonbau | Year: 2016

The new Lahntalbrücke in Limburg is a semi-integral prestressed concrete structure that has emerged from a design competition. It is distinguished by its slender, attractive design. The superstructure is currently erected as balanced cantilever construction. Subsequently, the peculiarities of the deformation calculation of the Lahntalbrücke are presented. The considerations about the allocation of the construction sections are discussed. The individual amounts of deflection to be considered are shown and the resulting deformation calculation is explained. Finally, the implementation of the deformation calculation regarding deflection measurements on the construction site is presented. Copyright © 2016 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin.

Mensinger M.,TU Munich | Ganslmeier S.,Buchting Streit AG | Rengstl M.,TU Munich | Karpa M.,Ingenieurburo Grassl GmbH
Stahlbau | Year: 2016

The paper deals with current issues concerning the design of roller bearings in bridge construction. An overview of current dimensioning using normative standards in DNI EN 1337-4 and SIA 263 for roller bearings is given. Based on the choice of materials, various relationships are deduced. This article will allow the reader to critically question the current design methods and historic roller bearings can then be replaced using the current structural system © 2016 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin.

Behnen G.,Buchting Streit AG | Nevrly T.,Buchting Streit AG | Fischer O.,TU Munich
Geotechnik | Year: 2015

Abstract In general, tunnel analyses are complex engineering tasks. This is mainly due to non-linear effects determining the overall loadbearing behaviour (even under service load conditions) because no clear separation between action and resistance is possible (safety concept) plus a series of interdependencies and interaction effects that must not be neglected in most cases. In order to achieve a realistic simulation of the actual behaviour and to gain reliable results, non-linear effects in the ground as well as physical and geometrical non-linearities in the structural behaviour of the tunnel lining, and the interaction of the soil and structures, need to be modelled carefully. When simplifications are to be introduced into the design, it is important that the simplified approach be conservative, that deformation results are in a realistic order of magnitude and, finally, that the analyses lead to adequate solutions regarding costs and workability on site. Over the past decade, the finite element analysis (FEA) method has become more and more established internationally as a general numerical tool suitable for these diverging requirements. Where FEA is used in an appropriate way, the method allows almost all-embracing detailed modelling and may provide comprehensive and realistic results taking into account all relevant effects, including soil-structure interaction. The crucial factor in this is the determination of a realistic ground-structure stiffness ratio, especially if non-linear characteristics are to be taken into account, because the reaction forces (bedding) and the distribution of the load portions to be carried by the tunnel lining and the supporting ground are mainly determined by the stiffness and interaction parameters. Inadequate estimation of these governing parameters may lead to an unrealistic assessment regarding the loadbearing behaviour of the tunnel and thus - depending on the magnitude and direction of the deviation - to a wrong and uneconomic or unsafe design. During the authors' many years in design management, detailed design and value engineering and performing independent checking and design reviews for large international tunnel projects, their experience was that FE modelling may in numerous cases lead to improper results if the basic relations and plausibility checks were not considered in an adequate way. In the light of this, the case studies presented in section 5 illustrate some typical practical examples. The present paper is intended to point out the most relevant relations, interdependencies and typical problems in soil-structure interaction analyses which should be well considered when performing tunnel analyses utilizing the FEA method. The main aim is to provide valuable recommendations and advice on the formulation of reliable, practice-oriented and robust numerical models in order to improve the overall quality of tunnel analyses. Copyright © 2015 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin.

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