Dr.-Ing.

Albrecht, Stefan

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  • Publication
    Reliable design of adaptive load-bearing structures with focus on sustainability
    ( 2020)
    Ostertag, Andreas
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    Dazer, Martin
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    Bertsche, Bernd
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    Schlegl, Friederike
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    Albrecht, Stefan orcid-logo
    ;
    Leistner, Philip
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    Gienger, Andreas
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    Wagner, Julia
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    Tarín, Cristina
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    Sawodny, Oliver
    Nowadays large amounts of raw materials are used in the building industry. Conventional design methods for passive constructions are at the limit of what's permissible according to standard and oversized for most of their design life. In order to reduce the consumption of raw material and the environmental impact caused by its production, an actuation of the load-bearing structure is a possible way forward. Such a structure is able to adapt to different load cases by specifically manipulating internal stresses using actuators installed in the structure. This paper introduces a design procedure applied to an adaptive high-rise load-bearing structure demonstrating reliability and includes the changing environmental impact. The trade-off between oversizing, which leads to high reliability and savings of raw material for minimal environmental impact needs to be solved for unique structures with quantity one. By use of a linear-elastic model the effect of wind loads is simulated and actuator forces and tensions were calculated. In the total balance the energy consumption of the actuators and its related greenhouse gas emissions as well as the intended savings due to the reduced need for raw materials in production is included. In conclusion, replacing building material with energy can be a promising way forward on the condition, that electric energy will become increasingly environmentally friendly in the near future, whereas natural resources for materials are limited.
  • Publication
    Effect of different technological and energy supply related measures on the primary energy demand of CFPR production
    ( 2016)
    Wehner, Daniel orcid-logo
    ;
    Hohmann, Andrea
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    Schwab, Bernhard
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    Albrecht, Stefan orcid-logo
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    Ilg, Robert
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    Sedlbauer, Klaus
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    Leistner, Philip
    ;
    Drechsler, Klaus
    Carbon reinforced plastics (CFRP) are well-known for their excellent weight specific properties, resulting in energy reduction and emission savings during the use phase. Due to the required amount of raw materials and energy in the production phase, the holistic sustainability of these materials significantly depends on the manufacturing method, the achieved weight reduction and the respective application. One important key performance indicator to describe the sustainability of products over their whole life cycle is the primary energy demand (PED). The PED includes all sources of primary energy that have to be withdrawn from the environment in order to provide the function of a process, a product or a service. The presented study provides both manufacturers and users of CFRP with the means to effectively reduce the PED of CFRP production by investigating the effect of different technologically and energy supply related measures and their interdependencies along the process chain of CFRP production. The results show a great variance of the PED depending on particular, partly interdependent parameters in the process chains and highlight the importance of a detailed investigation of the state of the process chains subject to optimization.