Arbeitspapiere der BAM
Filtern
Dokumenttyp
- Sonstiges (2)
Sprache
- Englisch (2)
Referierte Publikation
- nein (2)
Schlagworte
- Active learning (1)
- Bayesian inverse problems (1)
- Coupler systems (1)
- Gaussian Process Regression (GPR) (1)
- High-speed (1)
- Parameter identification (1)
- Reinforcement (1)
- Surrogate models (1)
- Tensile test (1)
- Test specification (1)
Organisationseinheit der BAM
- 7 Bauwerkssicherheit (2) (entfernen)
This document presents the specification for the execution and evaluation of high-speed tensile tests on reinforcement bar coupler systems. This specification was developed at BAM - Bundesanstalt für Materialforschung und -prüfung (Federal Institute for Materials Research and Testing, Germany) - following test principles from related international standards.
The present document represents the latest status of the test specification. It is noted that until 2010 the test procedure was characterised on a test velocity based on L0. In an improved test conception and after intensive investigations in cooperation with industry partners, this procedure has been updated to consider instead a test velocity based on Lr, since this warrants more comparable and meaningful results.
We introduce a novel adaptive Gaussian Process Regression (GPR) methodology for efficient construction of surrogate models for Bayesian inverse problems with expensive forward model evaluations. An adaptive design strategy focuses on optimizing both the positioning and simulation accuracy of training data in order to reduce the computational cost of simulating training data without compromising the fidelity of the posterior distributions of parameters. The method interleaves a goal-oriented active learning algorithm selecting evaluation points and tolerances based on the expected impact on the Kullback-Leibler divergence of surrogated and true posterior with a Markov Chain Monte Carlo sampling of the posterior. The performance benefit of the adaptive approach is demonstrated for two simple test problems.