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Das Gesamtprojekt kann als ein richtungsweisendes Beispiel für ein ressourcenschonendes Bauen im Bestand angesehen werden. So wurden durch die weitgehende Nutzung der Bestandsstruktur ein CO2-Äquivalent von fast 8500 t gegenüber einem vergleichbaren Neubauvolumen eingespart und knappe Materialressourcen wie Kiese und Sande geschont. Gleichzeitig entstand ein markantes Bürogebäude im Stadtraum, das über einzigartige, vielfach gestalt- und nutzbare Innenräume verfügt. Im Projektverlauf zeigte sich die große Bedeutung von umfassenden Voruntersuchungen für das Bauen im Bestand, die neben der Konstruktionsanalyse und der Erfassung von verformungsgerechten Geometrien vor allem auch gründliche Materialuntersuchungen beinhalten sollte. Im Projekt wurden einige dieser Grundlagen erst in der Realisierungsphase umgesetzt, was an mehreren Stellen zu iterativen Anpassungen von Planungen, Terminen und Kosten führte. Überraschungsmomente wie ein lokales Materialversagen werden sich allerdings nie vollständig ausschließen lassen. Damit bleibt das Bauen im Bestand eine alternativlose Herausforderung der Zukunft für Planer und Bauherren. Ein neues Thema bildet dabei ein entwurfbegleitendes Life Cycle Assessment in den frühen Projektphasen, um das richtige Gleichgewicht zwischen den Anforderungen der Minimierung von Emissionen und dem Verbrauch neuer Materialressourcen und den Potenzialen des Bestands und seiner neuen Nutzung zu finden.

UP!Berlin - Transformation of a reinforced concrete large-scale structure
The overall project can be seen as a pioneering example of resource-saving construction in existing buildings. By using the existing primary structure to a large extent, a CO2 equivalent of almost 8500 t was saved compared to a comparable volume of new construction and limited material resources such as gravel and sand were saved. At the same time, a striking office building was created in the urban space, which has unique interior spaces that can be designed and used in many ways. The project's progress showed the great importance of extensive preliminary investigations for design and construction in existing structures, which, in addition to the design analysis and the recording of geometries suitable for deformation, should, above all, include thorough material investigations. In the project, some of these fundamentals were not established until the realisation phase and led in some places to iterative adjustments of plans, schedules and costs. However, surprise moments such as local material failure can never be eliminated entirely. Thus, the design and construction of existing buildings remain an unavoidable challenge for planners and clients in the future. A new topic in this context is a design-accompanying life cycle assessment in the early project phases to find the right balance between the requirement of minimising emissions and consumption of new material resources with the potential of the existing building stock and its further use.

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Extended keynote paper of Eurosteel 2021
This paper provides an overview of recent work regarding the revision of Eurocode 3 on the European level. Selected scientific and technical issues are described and there is a summary of the activities executed within European Standardization Committee CEN/TC250/SC3 “Design of Steel Structures” chaired by Prof. Dr.-Ing. Ulrike Kuhlmann. This includes the description of current normative developments for the 2nd Generation of Eurocodes, which aim at evolution through improvements and harmonization of the existing codes. In addition, a technical review of selected rules is given for several issues, which support the code revision and reflect well the recent tendencies in steel structures.

Das Bundesfinanzministerium vollzieht einen doppelten Salto rückwärts und wendet die Grundsätze des BFH-Urteils vom 14.05.2014 zur Gewinnrealisierung nicht generell an. Betroffene Unternehmer können aufatmen.

Wissekerke castle park in Belgium contains mainland Europe's oldest remaining iron suspension bridge (1824). In 1989, after years of neglect, the Kruibeke town council bought the castle, park and finally, in 2006, the bridge. The Architectural Engineering Lab of the Vrije Universiteit Brussel (æ-lab) was consulted to put the refurbishment on the right lines and to check whether this bridge can stand the shift in function from private to public.
This paper places the pedestrian bridge within the framework of 19th century bridge construction, determines its historical value, characterizes the used materials by metallographic methods combined with tensile and hardness tests, re-analyses the structure, proposes strengthening strategies and concludes with a renovation proposal that preserves all of the authentic elements, causes the least visual impact, is durable and guarantees continued public use.

In 1988 the Tonstad power plant (Norway) was upgraded from 640 to 960 MW. The headrace system to the reservoirs was not upgraded except for an additional pressure shaft, surge tank and an additional sand trap. Even with about 50 % higher discharge in the main tunnel, the sand traps worked adequately after the commissioning. However, in recent years, higher flexibility of demand is challenging the power plant and has resulted in events with flushing of sediments to the turbines. Higher flexibility demands also challenge the current surge tank design. During one event, free surface flow is believed to have occurred in the sand trap since severe damage to two of the turbines was observed. This contribution presents the background of the power system situation at the Tonstad power plant and the current flexibility demands of the power market and its challenges for the hydraulic system, as well as the proposals to solve the sand trap issues and the oscillation demands for the surge tank. The paper discusses the possibility of utilizing a model predictive controller with real-time flow simulations to solve the challenges without structural reconstruction, and possible options should structural reconstruction be necessary. The contribution compares analysed options for improving the efficiency of sand traps. Finally, an outlook is offered to future demands for flexibility in hydropower plants with increasing supply of renewable power sources.

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