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Risk-based asset management and the potential of UHFB in railway bridge construction from the point of view of the infrastructure operator
Web meeting March 4th, 2021. 16: 00-17: 00. Speaker: Dipl.-Ing. Herbert Friedl, SBB AG - infrastructure, Head of Asset Management in Civil Engineering.
Register (free of charge): Click Here. Language: German. Organised by Austrian Group of IABSE.
The Swiss Federal Railways -SBB- manage a remarkable infrastructure system with over 6,000 bridges, more than 17,000 retaining walls and over 400 tunnels. These structures alone represent a replacement value of around 30 billion Swiss francs. So far, decisions regarding building maintenance and future cost planning have mainly been used for the condition classes (grades) of the individual buildings.
As part of the further development of the asset management of civil engineering structures, a change from the condition-based approach to a risk-based approach is planned. Many additional parameters are taken into account. Evaluations of the probability of failure of structures, estimates of the volume of traffic on the lines and on the bridges, etc.
A risk-based model for railway bridges has been developed and can be used to identify top risks and differentiate at the network level. In 2017, the SBB realized a railway bridge which was built from reinforced UHFB.
The advantages of structures made of UHFB are lower life cycle costs and, thanks to the modular design with a high degree of prefabrication, enable shorter construction times and thus fewer operational restrictions. The bridge with a span of 6.0 m was equipped with a monitoring system in order to record the behavior of the structure as a result of train crossings. After three years of monitoring, the results confirm the correct behavior of the bridge and future structural maintenance will be carried out according to existing standards. This webinar will introduce the new risk-based approach to asset management and presents UHFB applications at SBB.
Webinar: Artificial Neural Networks (ANN): Applications to confined concrete coumns and shear in beams
March 15, 2021 Organised by the Philippine group of IABSE.
Register here: Click Here
Webinar: Parametric Structural Design with Isogeometric Analysis
Date: 9 April (Friday), 2021, 14-15 hrs (CET, GMT +1). Speaker: Dr. Anna Bauer, Czech Republic; Moderator: Prof. Jan Wium. Organised by the South African group of IABSE.
Register (free of cost): Click Here
Isogeometric analysis (IGA) is a fairly new approach within finite element analysis. In contrast to classical approaches that require a replacement of the CAD model by a finite element model, IGA omits this step by using the same parametric description also for the analysis. The Ansatz functions used are usually Non-uniform Rational B-Splines (NURBS). The smooth basis functions and the seamless link to CAD provides a lot of possibilities in the design of structures. This talk will give a brief overview of IGA and the respective requirements and challenges. Furthermore, the potentials of the method within the parametric design of light-weight structures, such as bending-active structures with mounting processes and form finding of tensile membrane structures, are highlighted.
Speaker: Dr. Anna Bauer is a structural engineer at Mayr Ludescher Partner and recently finished her Ph.D. at the Chair of Structural Analysis of Prof. Dr.-Ing. K.-U. Bletzinger at the Technical University of Munich. She is exploring and developing the novel simulation approach of isogeometric analysis with CAD-integration for the design of lightweight structures. The applications are manifold but one main focus is the construction process of bending-active structures. She received her B.Sc. (2012) and M.Sc. (2015) in Civil Engineering at the Technical University of Munich. In 2018, she was awarded the IASS Hangai Prize for her paper on sliding cables with isogeometric analysis at the annual symposium.
Moderator: Prof. Jan Wium, responsible for the discipline in Construction Engineering and Management, at Stellenbosch Univeristy, South Africa. His research areas encompass construction risk, design management, modular construction and the use of technology in construction. He has served as an Editorial Board Member for IABSE's journal SEI, and as a governing body member in several committees within IABSE. He completed his PhD from EPFL, Lausanne, Switzerland.
Webinar: Ultra-High-Performance-Concrete (UHPC)
Date: 30 April (Friday), 2021, 14-15 hrs (CET, GMT +1). Speaker: Prof. Lukas Vrablik, Czech Republic; Moderator: Prof. Roman Lenner, South Africa.
Registration Link: Click Here. Organised by the South African Group of IABSE.
The topic of webinar will be practical use of Ultra-High-Performance-Concrete (UHPC) as the main material for superstructure of pedestrian bridges. Two practical examples of real pedestrian bridges will be presented – first is a segmental single span bridge (completely made by UHPC segments) and the second example is a cable stayed pedestrian bridge where the superstructure is composed of UHPC segments. Information about design (material and structural analysis, detailing and construction stages) will be described and presented.
Moderator: Roman Lenner – Associate Professor at Stellenbosch University and IABSE National Chair of South Africa, Member of IABSE TG1.3 Work Group and Joint Committee for Structural Safety. Main research interests are structural reliability, bridge design and bridge traffic loading. Practical experience involves bridge design in USA and design review of tunnels in Germany along with working as a World Bank consultant for transportation projects in southern Africa.
Speaker: Lukas Vrablik – Associated professor CTU in Prague, Head of Department of Concrete and Masonry Structures; Technical director Valbek; Member of group for Eurocode and Model Code implementation; specialized for bridge design (long span bridges, arch bridges, pedestrian bridges), mathematical simulations of structure and material behaviour; monitoring of existing structures. Author or co-author of more than 100 publications and contributions to proceedings, 2 patents, 1 momograph.