Untersuchungen zu Herstellungs‐ und Instandhaltungs kosten von unterschiedlichen Konzepten zur Sicherstellung der Dauerhaftigkeit von Parkbauten

Research of production and maintenance costs for alternative concepts to ensure the durability of parking buildings There is currently an intense discussion about how to ensure the durability of parking buildings. Without having carried out a comprehensive cost analysis for the alternatives for durability concepts costs are nevertheless used as an argument for or against a certain execution. In this publication the costs of various execution concepts are compared on the basis of a virtual two‐storey underground garage with standard dimensions for the two major components of ”suspended ceiling“ and ”baseplate“. For instance the cost analysis includes the production costs for the minimum reinforcement in dependence of the examined surface protection or of the waterproofing system respectively. Furthermore the costs for maintenance, inspection and repair among other aspects are compared in dependence of the surface protecting system for a service life of 50 years. This cost approach takes into account consists of market fluctuations as well as scheduled maintenance cycles by considering medium, minimum and maximum costs. For the suspended ceiling the following coating or waterproofing systems respectively are examined: surface protection system ”OS 11“; ”mastic asphalt (single/double layer) with asphalt sheeting ”; ”mastic asphalt (single/double layer) with surface protection systems OS 10“ and ”PMMA“ protecting surface system. For the base plate two load cases are investigated: ”water exchange zone“ (WW) and ”water pressure“ (WD) in combination with the following surface protection systems: ”OS 11“, ”mastic asphalt (single/double layer) with asphalt sheeting“ and ”OS 8 with accompanying crack treatment“. For the ongoing maintenance costs, engineering values are chosen in accordance to the current state of knowledge. It is expected that current research projects are going to provide scientific results in the near future allowing an update of this cost analysis.     

Haltung zur Erhaltung

Attitude towards preservation Hydraulic structures have always been designed as long-lasting infrastructure assets, which is also reflected in current codes for new structures. Climate change and climate protection confirm the need for durable structures with the longest possible service life. Existing hydraulic structures should fulfil this objective and be maintained for as long as is technically, operationally, economically and ecologically feasible. Maintenance should not only ensure that the planned service life is achieved, but should also extend the service life. This can be achieved, for example, through more realistic structural verifications of the structures, through maintenance and through optimized refurbishment.     

Prognosis of gas turbine remaining useful life using particle filter approach

Gas turbines are commonly used in distributed power generation. Because of high speed nature, they require good maintenance for increased reliability and availability. Remaining useful life prediction is therefore an essential part of condition‐based maintenance to better foresee future state hence guaranteeing design efficiency, reduced maintenance cost, and improved safety. Gas turbines also contain a lot of sensors data that need to be processed for better prediction. In this paper, a probabilistic approach called particle filter is used for prediction. The proposed approach is tested using Turbofan degradation data provided by NASA as a benchmark problem. Meanwhile, through time the gas turbines experiences a change from normal state to degraded state attributed to aging, corrosion and erosion etc. Hence, in the context of abundant data, it is helpful to know the transition between states. For the same reason, the present paper suggests a statistical approach called Z‐test. The test results show that the proposed technique provides score and MAPE values of 559.9 and 21.6 respectively, comparable to past reported performance.     

Historischer Abriss zur Entwicklung des Nachhaltigen Bauens

Der Artikel beschäftigt sich mit der historischen Entwicklung des Nachhaltigkeitsgedankens und zeigt die sich daraus ergebenden Anforderungen und Qualitäten für das Nachhaltige Bauen auf. Ökonomische, ökologische und soziokulturelle Aspekte sind im Rahmen des Nachhaltigen Bauens über den gesamten Lebenszyklus eines Gebäudes “von der Wiege bis zur Bahre” gleichwertig zu betrachten. Daraus ergeben sich vielfältige Wechselwirkungen und Abhängigkeiten, die mit den Methoden einer ganzheitlichen Planung optimiert werden können. Für verschiedene ökologische, ökonomische und soziokulturelle Aspekte werden exemplarisch diese Abhängigkeiten und die sich daraus ergebenden Konsequenzen beschrieben. Historical development of sustainable building. This article deals with the historical development of sustainability and it depicts on the resulting requirements und qualities for sustainable building. Ecological, economical und socio‐cultural aspects have to be regarded as equal considering the whole life‐cycle of the building from ”cradle to grave”. Due to this several interdependencies arise that can be optimised by means of ecological and economical life cycle analysis. Regarding several ecological, economical und socio‐cultural aspects this article identifies those dependencies and reveals the resulting implications.