Artikeldatenbank
Autor(en) | Titel | Zeitschrift | Ausgabe | Seite | Rubrik |
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Wagner, Oliver Kai; Haas, Dieter; Druckfeuchter, Hubert; Schachinger, Tobias | The challenges of contract SBT1.1 "Tunnel Gloggnitz" / Die Herausforderungen des Bauloses SBT1.1 Tunnel Gloggnitz | Geomechanics and Tunnelling | 6/2015 | 554-567 | Topics |
KurzfassungThe second of the three tunnelling contract sections of the Semmering Base Tunnel is of comparable complexity to the first contract section SBT2.1. The geotechnical and hydrological conditions for sequential tunnelling are demanding and require extensive grouting and investigation measures in advance of the drives. The enormous extent of the construction works and the need to access parts of the running tunnels through an intermediate construction access are a logistical challenge. The construction time is also very ambitious. These circumstances had to be considered in the production of the tender documents. x | |||||
Schoch, Torsten; Pallesen, Niels Jorgen | The clever compound solution - the Ytong Energy+ / Die clevere Compound Lösung - der Ytong Energy+ | Mauerwerk | 3/2014 | 169-175 | Fachthemen |
KurzfassungThe development of EU regulations dealing with energy conservation will sooner or later lead to changes in all member states - usually involving stricter insulation targets. In all markets traditionally dominated by solid construction methods, this development may make it harder for the monolithic construction method to retain its market share, because both the physical and commercial limitations - to a certain extent - appear insurmountable. The obvious solution seems to be to resort to thicker insulation material. But there are other alternatives. One of them has been developed initially specifically for the Scandinavian market where the climate has traditionally dictated tough thermal insulation requirements. In Denmark for example, U-values of 0.15 W/(m²K) are considered standard today. With conventional thermal conductivity, this U-value presents a challenge even when using autoclaved aerated concrete if one wants to retain familiar, commercially viable wall dimensions. But there are other possibilities: the compound solution offered by the Ytong Energy+ block. x | |||||
Kido, Ewa Maria; Cywi ski, Zbigniew | The colours of steel bridges in Japan - principles and examples | Stahlbau | 3/2016 | 181-194 | Fachthemen |
KurzfassungIt is presently recognized worldwide that the colours of steel bridges - besides their form - serve as one of the key factors of their aesthetic design. This paper refers to the colouring problem being characteristic of Japan, since - in addition to the respect for the usual theory of colours - special Japanese particulars, based on tradition and philosophy of life, are followed. Several bridge examples shown here stand for the accentuation effect of that special approach. x | |||||
Cladera, Antoni; MarÃ, Antonio; Bairán, Jesús Miguel; Ribas, Carlos; Oller, Eva; Duarte, Noemà | The compression chord capacity model for the shear design and assessment of reinforced and prestressed concrete beams | Structural Concrete | 6/2016 | 1017-1032 | Technical Papers |
KurzfassungA simplified mechanical model is presented for the shear strength prediction of reinforced and prestressed concrete members with and without transverse reinforcement, with I, T or rectangular cross-section. The model, derived with further simplifications from a previous one developed by the authors, incorporates the contributions of the concrete compression chord, the cracked web, the dowel action and the shear reinforcement in a compact formulation. The mechanical character of the model provides valuable information about the physics of the problem and incorporates the most relevant parameters governing the shear strength of structural concrete members. The predictions of the model fit very well the experimental results collected in the ACI-DAfStb databases of shear tests on slender reinforced and prestressed concrete beams with and without stirrups. Due to this fact and the simplicity of the derived equations it may become a very useful tool for structural design and assessment in engineering practice. x | |||||
Illeditsch, Mariella; Preh, Alexander | The concept of design block size - A critical review of ONR 24810 "Technical Protection against Rockfall" | Geomechanics and Tunnelling | 6/2020 | 604-611 | Topics |
KurzfassungIn Austria, the Guideline for “Technical Protection against Rockfall”, named ONR 24810 provides guidance to assess rockfall hazard (at object scale) by determining a so-called design block size. The aim of this article is to critically review the concept of design block size and to suggest alternatives. The design block size is derived from a block size distribution and event frequency, both of which may be very uncertain. Modelling a single “constant” design block may result in trajectories far away from reality. The design approaches of ONR 24810 and Eurocode 7 are compared. A case study is presented and discussed. Reducing input parameters at the beginning of the design approach results in apparent characteristic energy levels and bounce heights, which are not characteristic, as defined by EC7. By disregarding all small and the biggest blocks, valuable information of maximum energy levels and bounce heights is lost. The entire block size distribution should be used for rockfall simulations, rather than a single block size. Fragmentation should be considered, if applicable. x | |||||
Spiegl, Markus; Sander, Philip; Pellar, Alfred; Maidl, Ulrich; Herdina, Johann; Feistmantl, Klaus | The conclusions of risk analysis as a basis for deciding between variants through the example of Contract H8 / Ein Fazit zur Risikoanalyse als Grundlage für eine Variantenentscheidung am Beispiel Los H8 | Geomechanics and Tunnelling | 4/2011 | 295-304 | Topics |
KurzfassungThe Brenner Eisenbahn GmbH (BEG) was appointed in 1995 to design and construct the new railway line in the Lower Inn Valley between the national border near Kufstein and Innsbruck. In the densely populated Inn Valley, large parts of the line with a planned speed of 250 km/h had to be run through tunnels. Near Jenbach, a semi-quantitative process was used as part of a risk analysis for the decision between the variants of a shallow, mined special construction and a deep mechanically driven tunnel. x | |||||
The Conservation and Structural Restoration of Architectural Heritage (G. Croci) | Bautechnik | 6/2001 | 452-453 | Bücher | |
Schönlechner, Christian; Bitschnau, Markus | The construction of the Obervermuntwerk II pumped storage power station / Die Bauausführung des Pumpspeicherkraftwerks Obervermuntwerk II | Geomechanics and Tunnelling | 5/2016 | 435-446 | Topics |
KurzfassungThe joint venture Bau Obervermuntwerk II, consisting of the companies Jäger Bau, Porr, Östu-Stettin and Hinteregger are constructing the pumped storage works Obervermunt II (OVW II) under a contract from the Vorarlberger Illwerke AG between the Silvretta and the Vermunt reservoirs. The Obervermuntwerk II is being built as a parallel works to the existing Obervermuntwerk (OVW). Together with the OVW II, a new headrace is being built for the existing Obervermuntwerk and the existing overground penstock will be demolished. All excavation is being undertaken conventionally by drill and blast; only the surge tank and the pressure shaft will be excavated by raise boring previously excavated mucking shafts. The aggregates for the concrete of the Obervermunt II power station (about 200,000 m3) are being prepared from excavated material as far as possible. A dedicated material processing plant for the project is being operated in Vermunt as well as a batching plant. x | |||||
Hofinger, Johann | The contribution of building-integrated geothermal systems to the energy transition / Der Beitrag gebäudeintegrierter Geothermieanlagen zur Energiewende | Geomechanics and Tunnelling | 5/2016 | 451-457 | Topics |
KurzfassungIf international agreements to replace fossil fuels with renewables are taken seriously by politicians, a much broader use of environmental-friendly energy sources will be needed for heating and cooling purposes in the future. This necessary decarbonisation can be supported by the use of heat pumps in combination with geothermal absorbers, which have particular advantages since a large part of the heat used is extracted from the environment surrounding the building. The advantage of building-integrated geothermal systems also lies in the simple and inexpensive supply of cooling energy, which can be accomplished either by free cooling or by reversing the heat pump circuit. The geothermal plants at Salzburg railway station and the Austria Campus will be exemplified and operating experience is given. x | |||||
Anagnostou, Georgios | The contribution of horizontal arching to tunnel face stability | geotechnik | 1/2012 | 34-44 | Fachthemen |
KurzfassungThe article revisits the classic problem of tunnel face stability with special emphasis on the effect of horizontal stresses. These are important for shear resistance and thus also for the equilibrium of the potentially unstable body in front of the tunnel face, but they also present the difficulty of static indeterminacy. Starting from the computational model of Anagnostou and Kovári, an alternative model is presented, which is based on the so-called method of slices, and is consistent with silo theory, but does not need an a priori assumption as to the distribution of horizontal stress. In addition, a simple design equation for estimating support pressure under this model is presented and the results of comparative analyses concerning the average stresses in the wedge and the effects of shear resistance at the lateral slip surfaces are shown. The analytical results obtained by the method of slices agree very well with published results of numerical analyses and physical tests. x | |||||
Mirambell, Enrique | The convenient equilibrium between the development and updating of a normative code, research and engineering practice. | Steel Construction | 1/2021 | 1 | Editorials |
Kainrath-Reumayer, S.; Gschwandtner, G.; Galler, R. | The convergence confinement method as an aid in the design of deep tunnels / Das Kennlinienverfahren als Hilfsmittel für die Bemessung von tiefliegenden Tunnelbauwerken | Geomechanics and Tunnelling | 5/2009 | 553-560 | Topics |
KurzfassungThe convergence confinement method is used in its original form for the analytic or graphical description of the ground and system behaviour of underground excavations. The purpose of the method is to derive the support measures required from the combination of the ground characteristic curve, a model of the development of the radial deformations of the excavation surface in the axial direction of the tunnel, the support characteristic curve and the installation time and location of the support measures. The convergence confinement method is mostly used in the preliminary design of underground structures. x | |||||
Garbalinska, H. | The Current Problems of Building Physics in Rural Building | Bauphysik | 1/2002 | 45-46 | Berichte |
Wang, Yingliang; Gao, Zongyu; Shi, Jianhua; Liao, Mujie; Chen, Zonghui; Zhao, Wenyi | The design and construction of cable-stayed bridge over Bouregreg River, Morocco | Bautechnik | 2/2019 | 150-159 | Berichte |
KurzfassungThe Bouregreg cable-stayed bridge is located at Rabat-Salé-Kénitra, Morocco. It forms part of the new 41.5 km Rabat motorway bypass around the city of Rabat and will improve traffic congestion in Hay Riad, the capital's western residential suburb. This bridge has a total length of 951.66m, of which the main bridge is a cable-stayed bridge with spans arrangement of 183+376+183m and a total width of 29.82m. The main girder of cable-stayed bridge uses double pre-stressed concrete edge girders, connected with steel cross beams and concrete slab. The concrete pylon consists four separate curve legs, which forms a traditional pointed-arch on the top of pylon. This paper mainly describes the structural design features and construction of the cable-stayed bridge, and highlights some innovations of the design and construction, such as the connection between cable and pylon legs, steel cross beam and concrete edge beams, the concreting sequence of main girder and tension of stayed cables. x | |||||
Ernst , Claudia; Brunier , Knut | The Design Carport - A self-supporting folded steel sheet structure | Steel Construction | 3/2013 | 238-241 | Reports |
KurzfassungIn the design and making of complex architectural systems, sheet metal is still predominantly used as a cladding material. The objective here is to integrate innovative digital and analogue methodologies to develop a design system for a self-supporting lightweight structure entirely based on the use of sheet metal as a construction material. x | |||||
Lorenc, Wojciech | The design concept for the steel part of a composite dowel shear connection | Steel Construction | 2/2016 | 89-97 | Articles |
KurzfassungThe design concept for the steel part of a composite dowel shear connection is based on a geometric stress concept and it assumes the superposition of individual stress components resulting from longitudinal shearing and bending of a composite section. Analytical transformations of FEM calculation results for critical regions in steel dowels lead to the solution represented by closed interaction curves for the dimensionless shear resis tance of the connection versus the axial resistance of the web. x | |||||
Zhang, Min; Wan, Tianbao; Wang, Yingliang | The Design of Langqi Min River Bridge, Fuzhou, China | Steel Construction | 4/2012 | 244-249 | Reports |
KurzfassungOne key project in the Chinese city of Fuzhou is Langqi Min River Bridge, which connects the business and technology district with downtown Fuzhou. The main bridge is a twin-pylon cable-stayed structure with a main span of 680 m and a steel box girder. This paper presents the detailed design features of the bridge, including foundations, anti-ship collision devices, pylons, steel box girder and stay cables. x | |||||
Klobe, Berthold | The design of plane earthwork structures on pile foundations | geotechnik | 1/2021 | 24-32 | Aufsätze |
KurzfassungA newly developed design concept for plane earthwork structures on pile foundations is presented. This design concept is based on a complex mathematical background that has been derived using fundamental mechanical principles. The mechanical system comprises the arching effect in a plane earthwork structure on punctual supports. It incorporates the effect of an elastic membrane that is formed by orthogonal ribs of geogrids, the modulus of subgrade reaction between the piles and the elastic settling of the piles. Some practical design examples are shown. The important aspects of the analysis and the design are pointed out. The complete mathematical background and a comprehensive design tool for free use have been prepared and are provided through a download link: https://gft-pes.blogspot.com. x | |||||
Baker, William F.; Mazurek, Arek; Hartz, Christian | The design of structural "spider webs" | Steel Construction | 2/2018 | 118-124 | Articles |
KurzfassungDedicated to Prof. Werner Sobek on the occasion of his 65th birthday x | |||||
Mollaert, Marijke; De Laet, Lars; Pyl, Lincy; Devos, Rika | The design of tensile surface structures - From a hand calculation in 1958 to a contemporary numerical simulation | Steel Construction | 4/2015 | 251-258 | Articles |
KurzfassungThis paper summarizes the differences in the design approaches for tensile surface structures between the earliest structures in the 1950s and today’s practice. Current software tools allow more refined and advanced calculations. Nevertheless, a basic hand calculation can clarify the process in a few pages and provide the appropriate key data. A transparent setup allows the form-finding and structural analysis to be redone. The calculation of the cable net for the bandstand by André Paduart (1958) is analysed in this paper as a case study. Both the hand calculation (19 pages) and the numerical simulation are summarized and the design context of the initial and current calculations are described. The approximations made by Paduart resulted in a remarkably intelligible and coherent evaluation of the cable net structure. The historical approach can still be applied for a first verification of a pretensioned cable net or for a membrane structure as the simplified calculation method is similar. x | |||||
Thomas, Alun | The design of the Crossrail tunnels in UK | Geomechanics and Tunnelling | 4/2021 | 340-346 | Topics |
KurzfassungThis paper will focus on the use of fibre reinforced concrete on the Crossrail project in the UK. Crossrail (now named The Elizabeth Line) is a new railway running from West to East under the centre of London. This railway runs for approximately 14 km underground and five of the new stations were constructed with permanent sprayed concrete linings. Fibre reinforced concrete played a prominent role in all of the tunnelling - both for the segmental linings and the sprayed concrete tunnel (SCL) linings. Having reviewed the context of the project and the state-of-the-art in tunnel design at the time of the design, this paper will describe the design approach for both the TBM and mined tunnels and their fibre reinforced linings. While the segmental lining design followed a conventional approach, the SCL tunnels adopted an innovative design with the first major application of permanent sprayed concrete in the UK and featured the first use of a spray applied waterproofing membrane (SAWM) on a major project in Europe. Performance during construction will be reviewed and conclusions will be drawn on what can be learnt from the mega project. x | |||||
Galler, Robert; Handke, Dieter; Nolden, Mario | The determination of performance- and payment-relevant parameters in TBM tunnelling - State of the technology and outlook / Ermittlung leistungs- und vergütungsrelevanter Parameter für TVM-Vortriebe - Stand der Technik und Ausblick | Geomechanics and Tunnelling | 5/2014 | 511-519 | Topics |
KurzfassungThe success of mechanised tunnelling is greatly influenced by the interactive behaviour of machine and ground. A multitude of published research and practice reports documents the problem of a targeted forecast based on tests and forecasting models [19]. The paper describes the currently used methods of estimating performance-relevant parameters, including current research into the subject of crack propagation in solid rock and developments in disc force measurement on the tunnel boring machine and its forecasting from laboratory tests. x | |||||
The Developing City Exhibition | Steel Construction | 3/2012 | 203 | News | |
Coffman, Richard A.; Garner, Cyrus D.; Salazar, Sean E. | The development and implementation of a tunnel characterization method | Geomechanics and Tunnelling | 2/2014 | 178-184 | Topics |
KurzfassungThe Garner and Coffman method was developed to design a proposed underground facility based on an allowable settlement profile; the method may also be used to characterize an unknown underground facility based on an observed surface settlement profile. The method uses both static methods and 2-D finite element analyses to relate the characteristics of the ground surface settlement profile to the underground facility (depth, diameter, and number of tunnels). The calibration and validation of the Garner and Coffman method, as obtained by using tunnel segment data from historical tunneling projects (Bangkok, London, Taipei, Singapore, and Heinenoord), are presented. Specifically, the method was calibrated using settlement profiles and facility characteristics from 15 tunnel segments and validated using settlement profiles from 16 additional tunnel segments. A numerical relationship (developed during this research project) was then used during the validation of the model to predict facility characteristics for the “unknown” underground structures. The predicted depth and diameter for each of the “unknown” underground structures were within ten percent of the actual diameter and actual depth of the underground structure, as obtained from the literature. For all 16 validation tunnel segments, the tunnel location was predicted within one tunnel diameter of the actual facility centerline. x | |||||
Rast, Ronald | The development of building activity in Germany / Baukonjunkturentwicklung in Deutschland | Mauerwerk | 4/2018 | 211-214 | Fachthemen |
KurzfassungIn the last five years, the number of housing units completed in Germany has risen by around 50 %. In 2012, around 200 000 residential units were completed, and by 2017 there will be around 100 000 more. Nevertheless, this increase in residential construction activity continues to be less than the demand. What political framework conditions must the new Federal Government create for demand-oriented housing construction? What part will building materials and construction methods play in this development? This article provides answers to these questions. x |