Zum hygrothermischen Verhalten von Stahl-Sandwichelementen

Brieden, Matthias; Kuhnhenne, Markus (Thesis advisor); Feldmann, Markus (Thesis advisor); Holm, Andreas (Thesis advisor)

Aachen (2019, 2020)
Book, Dissertation / PhD Thesis

In: Schriftenreihe Stahlbau - RWTH Aachen Heft 88
Page(s)/Article-Nr.: 1 Online-Ressource (299, CDXXVII Seiten) : Illustrationen, Diagramme

Dissertation, Rheinisch-Westfälische Technische Hochschule Aachen, 2019

Abstract

In the present thesis the hygrothermal behavior of steel sandwich panels as elements of lightweight metal constructions is investigated.In addition to normative legal requirements, both the theoretical and scientific background as well as the mathematical-physical fundamentals are presented. Emphasis is placed on an integral hygrothermal-building physics view. Not only the standardized design procedures that are fixed in standards and regulations, but also alternative assessment approaches are explained. For steel sandwich panels or further constructions made of lightweight metal, hygrothermal simulation with numerical methods is proposed to be the suitably technique. By using hygrothermal simulation methods, constructions are examined whose increasing complexity is accompanied by rising relevance for building practice. In this process, questions and problems are picked up and investigated, for which solutions up to now subjectively-intuitive assessments are often known, but which have not been the subject of objective, systematic-scientific considerations. On the basis of two far-reaching parameter studies, initially the focus is on the individual component "top layer" for steel sandwich panels. Furthermore, the in-side of the elements and the drying behavior of the constructional unit "sandwich panel - longitudinal joint" are examined in detail. A consideration of hygrothermal aspects for the surface of the structural unit is also made. In this context not only geometric parameter are varied, but also effects and performance of different materials (insulating materials, sealants) as well as influences of environmental climates on the hygrothermal behavior are determined. As a basis for the conducted hygrothermal calculations, the applied numerical method was validated by means of normative specifications and further experimental results. The systematic compilation of the required material properties, as well as the derivation and deduction of associated material characteristics and functions is also an essential aspect of the remarks. The thesis summarizes normative and mathematical foundations. It presents the associated theory and the detection concepts derived from it. In addition to the ability to apply the obtained concrete results on the basis of the specific examinations in a practical manner, on the one hand the elaborations on the calculation method and on the other hand the summarized content on material properties can serve as starting points for further scientific considerations.

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