@incollection{ThielStengelGehlen, author = {Thiel, Charlotte and Stengel, T. and Gehlen, Christoph}, title = {Life cycle assessment (LCA) of road pavement materials}, series = {Eco-efficient Construction and Building Materials}, booktitle = {Eco-efficient Construction and Building Materials}, publisher = {Woodhead Publishing}, doi = {10.1533/9780857097729.2.368}, pages = {368 -- 403}, abstract = {At present the choice of materials and techniques in road construction is dictated by structural requirements and economic aspects. However, ecological factors have gained in importance due to environmental considerations in politics and society. To evaluate the environmental impact of motorways, a life cycle assessment (LCA) according to ISO 14040 was carried out for different pavement types. By investigating different case scenarios, the reduction potential of environmental impact was quantified. The biggest reduction in air pollution can be achieved by improving pavement properties (e.g., texture, stiffness and flatness) which would significantly reduce the fuel consumption of vehicles.}, language = {en} } @inproceedings{WagnerNeidhart, author = {Wagner, Bernd and Neidhart, Thomas}, title = {A new backfill material enhancing axial bedding of district heating pipes}, series = {Energy Geotechnics - Proceedings of the 1st International Conference on Energy Geotechnics, ICEGT 2016, Kiel, Germany, 29-31 August 2016}, booktitle = {Energy Geotechnics - Proceedings of the 1st International Conference on Energy Geotechnics, ICEGT 2016, Kiel, Germany, 29-31 August 2016}, publisher = {CRC Press}, address = {London}, isbn = {978-1-138-03299-6}, doi = {10.1201/b21938}, pages = {105 -- 112}, abstract = {District heating cost reduction efforts are amongst others focusing on the use of a new backfillmaterial. The OTH.R is investigating this material in regard to the engineering of buried district heating pipes.The main focus of this soil-structure interaction problem is axial bedding to reduce thermal induced elongations.The backfill material is characterized and an axial non-linear spring-based calculation method is described.Centerpiece of the method is the contact-working-resistance-line (CWRL).A new Rod-Shear-Test based testingdevice Re-SIST to investigate the CWRL for the new backfill material is presented. The investigated CWRL isdescribed and compared to the CWRL for sand, which is the conventional backfill material. Solutions using thespring-based calculation method are presented and a comparative example of calculation shows the differencein axial bedding when the new backfill material is used.}, language = {en} } @article{FinckhKipp, author = {Finckh, Wolfgang and Kipp, Sandra}, title = {Erfahrungen bei der Planung und Ausf{\"u}hrung von Ortbetonschachtbaugruben}, series = {Bauingenieur}, volume = {89}, journal = {Bauingenieur}, number = {1}, publisher = {VDI Fachmedien}, pages = {11 -- 19}, abstract = {Im Rahmen der Erstellung und Nutzung von Tunnel und Leitungsbauwerken ist oft eine Planung und Ausf{\"u}hrung von Ortbetonschachtbaugruben notwendig. Diese Ingenieurbauaufgabe erfordert aufgrund der zahlreichen Randbedingungen eine gute Interaktion zwischen Ausf{\"u}hrenden und Planer, um allen Anforderungen aus Statik, Baubetrieb, Vortrieb, Ausbau sowie sp{\"a}terer Nutzung gerecht zu werden. Mit der Auswahl eines geeigneten Bauverfahrens, einer g{\"u}nstigen Geometrie zusammen mit einer realit{\"a}tsnahen Berechnung kann f{\"u}r jede Schachtbaugruben eine optimale sichere und wirtschaftliche L{\"o}sung gefunden werden. Dieser Artikel gibt zahlreiche Hinweise um dieses Optimum zu erreichen.}, language = {de} } @misc{Schermer, author = {Schermer, Detleff}, title = {Mauerwerk-Kalender 2022}, volume = {47}, editor = {Schermer, Detleff and Brehm, Eric}, publisher = {Ernst \& Sohn GmbH}, address = {Berlin}, isbn = {978-3-433-03356-2}, doi = {10.1002/9783433611029}, pages = {654}, subject = {Mauerwerksbau}, language = {de} } @misc{Schermer, author = {Schermer, Detleff}, title = {Mauerwerk-Kalender 2021}, volume = {2021}, editor = {Schermer, Detleff and Brehm, Eric}, edition = {46}, publisher = {Ernst \& Sohn GmbH}, address = {Berlin}, isbn = {978-3-433-03293-0}, doi = {10.1002/9783433610732}, pages = {440}, subject = {Mauerwerksbau}, language = {de} } @inproceedings{DiamantidisLenziSykora, author = {Diamantidis, Dimitris and Lenzi, Daniele and S{\´y}kora, Miroslav}, title = {Optimal decisions based on monitoring - case study of steel roof}, series = {Proceedings of the Joint COST TU1402-TU1406 - IABSE WC1 Workshop, Zagreb 2-3 March 2017}, booktitle = {Proceedings of the Joint COST TU1402-TU1406 - IABSE WC1 Workshop, Zagreb 2-3 March 2017}, doi = {10.5592/CO/BSHM2017.4.7}, pages = {4.7-1 -- 4.7-7}, abstract = {Monitoring of structures and related decisions based on cost optimization are discussed in this contribution. Many research publications and experimental data are currently available on inspection and on monitoring and they represent the outcome of the remarkable work done. Not all the topics of interest are widely debated and implemented in standards. The current state-of-practice in standards is summarized and aspects to be included in future recommendations are proposed. The implementation of risk-based decisions is illustrated in a case study dealing with a stadium roof in Northern Italy. Snow actions are important especially in northern and mountainous regions where heavy snowfalls and related accumulation result to considerable loads. As the roof structure fails to comply with the requirements of Eurocodes, a permanent monitoring system has been installed to allow for real time evaluation of the reliability level of the structure. The system supplies the necessary information supporting immediate decisions on closure of the stadium in case of an extraordinary snow load. Cost-optimal decisions regarding the closure of the stadium are analysed based on a limit state function, on probabilistic models for the influencing parameters including measurement uncertainty, economic losses related to closure and failure consequences. The results demonstrate the potential of the use of the monitoring systems and probabilistic reliability analysis in order to support decisions and highlight the need for their implementation in future standards.}, language = {en} } @inproceedings{DiamantidisSykora, author = {Diamantidis, Dimitris and S{\´y}kora, Miroslav}, title = {Optimizing Monitoring - Implementation of Draft Guideline and Case Study of Roof Exposed to Snow Loads}, series = {Proceedings of 40th IABSE Symposium : Tomorrow's Megastructures, Nantes, France, 19-21 September 2018}, booktitle = {Proceedings of 40th IABSE Symposium : Tomorrow's Megastructures, Nantes, France, 19-21 September 2018}, publisher = {Curran Associates Inc}, address = {Red Hook, NY}, isbn = {978-3-85748-161-1}, doi = {10.2749/nantes.2018.s27-27}, pages = {8}, abstract = {This contribution addresses the optimisation of monitoring and decision-making criteria regarding the future use of structures and the related implementation in modern guidelines. A summary of the state-of-practice reveals deficiencies that are addressed by prospective guidance for the anticipated updates of standards, providing a general methodology to obtain cost-optimal decisions using limit state design, probabilistic reliability analysis and cost estimates. The implementation of a draft guideline and the corresponding risk-based approach are illustrated in a full-scale case study dealing with the roof of a stadium located in Northern Italy. The results demonstrate the potential of using monitoring systems and probabilistic reliability analysis in order to support decisions regarding safety measures such as snow removal, or temporary closure of the stadium.}, language = {en} } @inproceedings{DiamantidisHolickySykora, author = {Diamantidis, Dimitris and Holick{\´y}, Milan and S{\´y}kora, Miroslav}, title = {Target Reliability Levels Based on Societal, Economic and Environmental Consequences of Structural Failure}, series = {Proceedings of the 12th International Conference on Structural Safety \& Reliability (ICOSSAR 2017), 6-10 August 2017, Vienna, Austria}, booktitle = {Proceedings of the 12th International Conference on Structural Safety \& Reliability (ICOSSAR 2017), 6-10 August 2017, Vienna, Austria}, abstract = {Target reliability levels are derived by optimizing initial structural costs and considering three major types of potential consequences of structural failure: a) direct and indirect economic losses, b) societal consequences resulting from fatalities and injuries, and c) environmental impacts. The guidance on how to e stimate and combine these consequences is provided; societal consequences are expressed using the Life Quality Index (LQI) concept. The case study focused on a generic load-bearing member reveals that target reliability levels for structural design are commonly dominated by economic criteria.}, language = {en} } @inproceedings{HolickyDiamantidisSykora, author = {Holick{\´y}, Milan and Diamantidis, Dimitris and S{\´y}kora, Miroslav}, title = {Effects of Quality Control on Reliability of Reinforced Concrete Structures according to Eurocodes}, series = {fib Symposium 2016 : Performance-Based Approaches for Concrete Structures, 14, 2016, Cape town}, booktitle = {fib Symposium 2016 : Performance-Based Approaches for Concrete Structures, 14, 2016, Cape town}, abstract = {The effect of quality control on structural reliability represents an increasingly important concern of designers and thus is investigated in this contribution, focusing on reinforced concrete structures. Recent European documents for structural design - Eurocodes, fib Model Code 2010 and ISO 2394:2015 for general principles on structural reliability indicate that the partial factors may be adjusted to available information on the quality control of structures. In particular, the partial factors for concrete and steel strength may be significantly reduced taking into account actual execution quality and related available data. Using probabilistic methods of structural reliability, effects for execution quality are investigated in this contribution considering two fundamental reinforced concrete members: a beam (or slab) exposed to bending and a short column exposed to compression. It is shown that the reliability of reinforced concrete members may vary with the load ratio of variable and permanent actions. It appears also that the structural members of a basic quality, designed using unreduced partial factors, have a greater reliability level than the members of an increased quality, designed using the partial factors reduced according to EN 1992 1 1. This provides the basis for recommendations for further code developments.}, language = {en} } @inproceedings{KusterleThumann, author = {Kusterle, Wolfgang and Thumann, Maria}, title = {Pumpability of wet mixsprayed concrete with reduced clinker content}, series = {8th International Symposium on Sprayed Concrete : Modern Use of Wet Mix Sprayed Concrete for Underground Support, 11.- 14.06.2018, Trondheim, Norwegen}, booktitle = {8th International Symposium on Sprayed Concrete : Modern Use of Wet Mix Sprayed Concrete for Underground Support, 11.- 14.06.2018, Trondheim, Norwegen}, editor = {Beck, Thomas and Myren, Synn{\o}ve A. and Engen, Siri}, isbn = {978-82-8208-060-6}, abstract = {The research project „Advanced and Sustainable Shotcrete - ASSpC" aims at the improvement of sprayed concrete mix design regarding durability and sustainability. One possible improvement is to replace part of the clinker content in the binder with different supplementary cementitious materials. It is crucial that new mix designs fulfil the basic technical requirements on site concerning workability and early age development, too. One central issue of the project is to investigate which parameters influence the pumpability of sprayed concrete. Several test methods are used to determine the stability, tendency to segregation, bleeding and of course the consistency of concrete. An essential test method is a concrete sliding pipe rheometer (Sliper). This rheometer determines the pumping characteristics of concrete in the laboratory and on construction site. In comparison to other rheometers, the Sliper evaluates the rheological characteristics of the thin layer of paste which is lubricating the wall of the convey ing pipe. The paper presents the tests procedures in detail as well as first results from lab-tests and from site-tests with different advanced shotcrete mix-designs .}, language = {en} }