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G. Hochreiner, G. Styhler-Aydin:
"19th Century Iron Dome Structures in the Vienna Hofburg. An Insight into the Simplified Structural Assessment of that Period and Its Evaluation Using Modern Engineering Software";
in: "Structural Analysis of Historical Constructions, RILEM Bookseries 18", R. Aguilar (Hrg.); RILEM, 2018, ISBN: 978-3-319-99441-3, S. 891 - 900.

The use of iron load-bearing systems in all types of building structures (e.g. infrastructure, commercial buildings, sacred buildings, prestigious buildings) gained enormous importance during the urban devel-opment and expansion of Vienna´s city center in the second half of the 19th century. A recent case study on the iron dome structures in what is known as the Michaelertrakt of the Vienna Hofburg pro-vided the results of a detailed geometrical survey using high-tech instruments as well as archive docu-ments containing a simplified structural analysis and dimensioning of the cross sections of the cupola as annex to the proposal for construction in terms of weight and costs. The geometrical survey data served as a basis for subsequent structural modeling within a commercial structural engineering soft-ware. Taken together, the data allow both an examination of the simplified structural assessment meth-ods used at the end of the 19th century and an assessment of the present status of the historic dome structures with further information for their maintenance. The design for only vertical loading was in line with the theory of J. W. Schwedler. The extensions from A. Föppl were referenced for the design of the bracing system subjected to wind loads. The restrictions of the hand calculation formerly used made it necessary to make several simplifications, such as setting of additional hinges with conse-quences for the bending moments and superposition of different load cases. Finally, the consequences for neglecting the compatibility of displacements within this type of shell structure could now be evalu-ated and validated.

iron dome structures, structural modeling, 19th century structural assessment methods, Vienna Hofburg, maintenance, Schwedler-type dome

http://dx.doi.org/10.1007/978-3-319-99441-3_96