Im Rahmen des Forschungskolloquiums für Abschlussarbeitende, Doktoranden und Habilitanden laden wir herzlich ein zum Doppelkolloquium am 20. Juni 2023 in der Mönchebergstr. 7, Raum 3516.

16.30 Uhr beginnt der Vortrag von

Prof. Dr. Carlos Manuel Lázaro Fernández, Universidad Politècnica de València und Department of Mechanics of Continuous Media and Theory of Structures, TUM Lehrstuhl für Statik zum Thema Two Lightweight Structures with Steel-Fibre Reinforced Concrete.

 Two different projects of lightweight structures using steel-fibre reinforced concrete will be presented.

The first project is a recreation of Felix Candela’s famous “Los Manantiales” hypar shell in Mexico: the Oceanogràfic restaurant roof (Valencia, 2000) is considered to be Candela’s last built project, and is one of the first examples of use of steel-fibre reinforced concrete in architectural shell construction. We address the challenges and the solutions to design and build the shell roof according to Candela's philosophy in a context where the knowledge of designing and building thin concrete shells was practically lost.

The second project has a very different character: it is an experimental small footbridge with a bending-active deck of ultra-high performance fibre-reinforced concrete (UHPFRC). We have explored the possibility to pre-bend slender UHPFRC members to improve the shape of the structure. The footbridge prototype follows the bending-active bow-string concept. It has a span length of 5.4 m and is composed of a thin prestressed upper slab, a deviator and lower stainless-steel tensioning cables. The prototype takes advantage of the capacity of UHPFRC to resist traction and bending with microcracking in service conditions. 

17.30 Uhr schließt sich der Vortrag von 

Martin Fußeder M.Sc. (Vortragender) und Prof. Dr. Ing. Kai-Uwe Bletzinger TU-München, TUM School of Engineering and Design, Lehrstuhl für Statik an zum Thema

A Computational Engineering Tool for Sensitivity Analysis Based on the Method of Influence Functions.

The method of influence functions is a well-known engineering tool in structural analysis to investigate the consequences of load variations on deflections and stress resultants. Based on its strong relationship with adjoint sensitivity analysis [1,2] the method of influence functions can be generalized [3]. We show the connection of the two approaches and demonstrate in particular how influence functions can be identified as a sub-result of adjoint sensitivity analysis. Based on this knowledge, we propose a concept for the generalization of the method of influence functions as a tool for the computation of sensitivities. The traditional influence function approach can be seen as work balance based on Betti’s theorem. In our contribution we show how that work expression can be extended for sensitivity analysis with respect to various parameters. We discuss the significance of the resulting mechanically interpretable sensitivity analysis and its limitations. In that regard, we also specify how the graphical analysis procedure, for which the traditional influence function technique is well-known, can be generalized. The intention is to use those “sensitivity maps” to identify the positions of extreme influences and the individual effects of the partitions to the final sensitivity and its spatial distribution. In this way, structural analysis models of real-world engineering problems can be systematically explored and important model parameters can be identified.