BERNARD Ingenieure ZT GmbH
BERNARD Ingenieure ZT GmbH
Kammerlander J.,University of Innsbruck |
Kammerlander J.,Austrian Research Center for Forests |
Gems B.,University of Innsbruck |
Kossler D.,University of Innsbruck |
And 2 more authors.
International Journal of Sediment Research | Year: 2017
Mountain streams with their tributary torrents build the upper part of the fluvial network. They are important regarding the transfer of sediment from headwaters to lower basins. Channels are typically steep with wide grain size distributions, ranging from fine sand up to large boulders, and a stabilized bed surface. Mountain streams often are supply-limited with respect to mobile bed load, which needs to be addressed when bed load transport equations are applied to such streams. To better understand supply limitation, laboratory experiments highlighting the effect of bed load supply on incipient motion and bed load transport rate are discussed. Experimental tests were done in which fine bed load was supplied to a previously armored channel bed, with flow conditions ranging from one-third to twice the critical discharge for the bed surface. At flows not exceeding the critical discharge, the time series of the bed load transport rate at the downstream model boundary featured consistent patterns which are attributed to distinct phases: (i) a temporal lag, (ii) an equilibrium state, and (iii) a post-supply phase. Bed load transport occurred even at flows distinctly below that for incipient motion of the bed surface. But, with the mass of total bed load outflow approaching the supply amount, the mass did not exclusively consist of supplied grains. The coarser the supplied bed load, the more sediment was mobilized from the bed surface. At higher flows, processes differed. Total bed load outflow exceeded the supply amount and the break-up of the armor layer caused a refining of the bed surface. © 2017 International Research and Training Centre on Erosion and Sedimentation / the World Association for Sedimentation and Erosion Research
Holzleitner W.,BERNARD Ingenieure ZT GmbH |
Kraft-Fish M.,BERNARD Ingenieure ZT GmbH |
Steinacher R.,BERNARD Ingenieure ZT GmbH
Geomechanik und Tunnelbau | Year: 2014
The consultant Bernard Ingenieure has two decades of design, site supervision and technical assistance experience working with Indian contractors on hydropower and infrastructure projects on the Indian subcontinent. This article presents the lessons learnt by the consultant from these projects, in particular the 126 MW Dagachhu Hydropower Project, which is due to be completed in 2014. The article subsequently describes how the consultant has applied regulatory measures in tender documents for its ongoing projects, as well as ideas for further measures to be applied in future contract models. The regulatory measures intrude on what is traditionally considered to be the contractor's sphere of influence, such as selection of plant and equipment, personnel and works sequencing. Since the proposed measures are only as useful as the provisions to enforce their implementation, the fulfilment of contract conditions is linked to payment deductions, which have the aim of encouraging contractors to improve their performance and therefore project outcomes rather than to save cost. Projects in India would benefit from replacing awards based on the lowest price with Quality and Cost-Based Selection (QCBS), as this would promote improved Technical Proposals, hence an improved quality of construction. The marking schemes for Technical Proposals must be clearly defined and give traceable results to prevent subjective decision-making. © 2014 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin.
La Poutre D.,Bernard Ingenieure ZT GmbH |
Vill M.,OBB Infrastruktur Bau AG |
Immig R.,Bernard Ingenieure ZT GmbH
Structural Stability Research Council - Annual Stability Conference, SSRC 2010 - Proceedings | Year: 2010
This paper sets out to investigate the spatial stability of twin free standing arches of a road bridge recently under construction. The bridge is located in the southern part of Austria crossing a branch line of the newly built Koralm high speed railway line from the city of Graz to the city of Klagenfurt. The bridge is composed of concrete cantilevering abutments, a composite deck and steel circular arches with tubular cross section. The arches are arranged in a basket handle scheme, spanning 30 m and the bridge deck is suspended from them by means of twin hangers consisting of round steel bars. This paper focuses on the stability design according to Eurocode 3 of the steel arches. The critical elastic buckling loads (eigenvalue) of the entire system (including abutments) is determined numerically and the plastic strength is determined for the arches only with a separate FE-Model. Finally full non-linear FE-analyses are carried out to determine the actual ultimate load. In conclusion, the suitability of the design after Eurocode 3 is determined.
Ausserlechner A.,BERNARD Ingenieure ZT GmbH |
La Poutre D.,BERNARD Ingenieure ZT GmbH |
Fischer M.,OBB Infrastruktur AG
Stahlbau | Year: 2013
The new international railway bridge of the Austrian federal railways (ÖBB) connects the Swiss canton of St. Gallen with the Austrian federal state of Vorarlberg. This bridge is part of the single track route from St. Margrethen (CH) to Lauterach (A) and crosses the river Rhine at Lustenau. The tracks of this section are owned by the ÖBB and they form part of the international route from Zurich via Bregenz to Munich. The new bridge fulfills the requirements of flood control and reduction of travel time. Due to the requirements of the International Rhine Regulation (IRR) to allow a flow capacity of 4300 m3/s, the soffit of the new bridge had to be raised by 2 m compared with the old bridge and the new rail axis was offset 12m to the south. The new aligning allowed for an increase of speed from 60 km/h to 90 km/h. The project includes seven other bridges that had to be newly erected. During planning, close contact was held with the IRR, the federal state of Vorarlberg and Swiss authorities. In a bilateral agreement, it was defined that the Eurocode with Austrian national application documents would be used for the design. © Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin.
La Poutre D.B.,Bernard Ingenieure ZT GmbH |
Spoorenberg R.C.,TU Eindhoven |
Snijder H.H.,TU Eindhoven |
Hoenderkamp J.C.D.,TU Eindhoven
Journal of Constructional Steel Research | Year: 2013
This paper presents an experimental investigation of the elastic-plastic out-of-plane buckling response of roller bent circular steel arches subjected to a single force applied to the crown. The experiments are used to validate a finite element model described in a related paper. A series of 15 tests was performed on full-scale and model arches where the developed length of the arches was kept constant. The subtended angle was varied between 90 and 180. Each full-scale arch configuration was tested at least twice to monitor experimental scatter and assess the repeatability of the tests. Special attention was paid to the boundary conditions: at the crown the load was introduced at the centroid of the arch-rib with the use of hydrostatic bearing to eliminate any torsional restraint. Loading was applied by means of a tension rod affixed to the centre of the baseline, rendering a directed load. The supports were designed such that they acted as hinges in-plane while they were fixed out-of-plane. Geometric imperfections were measured prior to loading. All arches failed by elastic-plastic out-of-plane buckling featuring the presence of plastic zones in the arch-rib and out-of-plane arch deformation. © 2012 Elsevier Ltd. All rights reserved.
La Poutre D.,Bernard Ingenieure ZT GmbH |
Vill M.,OBB Infrastruktur AG
Stahlbau | Year: 2011
This paper describes a recently built bridge over the future Koralm Railway in southern Austria. The bridge was designed according to the corporate design requirements of the Österreichischen Bundesbahnen (ÖBB, Austrian Federal Railways). The bridge constitutes concrete cantilevering abutments with two free standing steel arches in a basket handle arrangement. From these arches a composite bridge deck is suspended. In this paper special attention is paid to the production of the arches and the influence it has on the structural design. © Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin.
Holzleitner W.,Bernard Ingenieure ZT GmbH |
Kraft-Fish M.,Bernard Ingenieure ZT GmbH |
Imre B.,Bernard Ingenieure ZT GmbH |
Preuth T.,Bernard Ingenieure ZT GmbH
Geomechanik und Tunnelbau | Year: 2013
When completed, the 292 km long Udhampur-Srinagar-Baramulla Rail Link Project will connect towns in the Kashmir Valley to the lowlands of India. The Government of India declared the railway as a "Project of National Importance" in March 2002. In October 2009 a 119 km section was put into operation. Works are expected to be completed by 2018. Austrian and other European consultants have been active on the project since its inception. This report concerns the design of a 15 km long central section of the railway between the Sumber and Arpin chala stations awarded to Bernhard Ingenieure ZT GmbH in 2012. Out of a total length of 15 km, 13.0 km are in tunnels, 0.9 km bridges, and the remainder are stations. The alignment section lies in the young Himalaya, passing through mountains on the western side of the Chenab River. Geological conditions are therefore demanding and tectonic activity is frequent. Although design is ongoing, this report presents the approach taken by the consultant in fieldwork, project optimisation, design and contractual specifications. The issue of muck disposal is also discussed. © 2013 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin.