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Author(s):	Ahrens, Mark Alexander; Mark, Peter
Title:	Lebensdauersimulation von Betontragwerken
Abstract:	Es wird ein Konzept zur direkten numerischen Simulation von Tragwerken über ihre Lebensdauer vorgestellt. Es beinhaltet materiell nichtlineare Einzelberechnungen mit Hilfe der Finite-Elemente-Methode (FEM) über die Zeit, wobei Eingangswerte von Material, Geometrie, Einwirkungen oder Degradationsmechanismen als streuende Größen eingehen und bezüglich ihrer Relevanz überprüft werden. Zahlreiche Einzelberechnungen mit nach verbesserten Monte-Carlo Verfahren bestimmten Eingangswerten führen zu Lebensdaueraussagen wie Restnutzungsdauern oder Schädigungsentwicklungen, die mit mittleren Werten und zu erwartender Streuung angegeben sind. Das Konzept wird an einer vorgespannten Bogenbrücke aus den 1950er Jahren angewendet. Es lässt sich auch vorausschauend nutzen, beispielsweise um Tragwerke im Entwurf für eine maximale Lebensdauer zu optimieren. Lifetime Simulation of Concrete Structures Stochastically based time-dependent analyses applied to a degraded arch bridge A concept to directly simulate lifetime of engineering structures is introduced. It comprises sets of materially nonlinear structural computations using the finite element method (FEM), thereby considering stochastic scatter of input parameters from domains of geometry, loads and degradation mechanisms. Distinct parameters contributions to lifetime are checked for relevance. Multiple computation of parameter sets generated by enhanced Monte-Carlo sampling leads to responses concerning residual structural lifetime or damage propagation. These responses are established by mean values along with expected standard deviations. The concept is adapted to simulate a degraded prestressed concrete arch bridge built in the 1950s. Additionally, it can be used in advance to optimize engineering structures right from the beginning of their planning processes to account for a maximum lifetime.
Source:	Beton- und Stahlbetonbau 106 (2011), No. 4
Page/s:	220-230
Language of Publication:	German

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