Zobrazeno 1 - 10
of 137
pro vyhledávání: '"Günter Hofstetter"'
Autor:
Peter Gamnitzer, Matthias Neuner, Magdalena Schreter-Fleischhacker, Alexander Dummer, Thomas Mader, Stefan Smaniotto, Günter Hofstetter
Publikováno v:
Underground Space, Vol 14, Iss , Pp 357-376 (2024)
In the present work, important aspects of time-dependent nonlinear 3D finite element (FE) models for deep tunnel advance by the New Austrian Tunneling Method (NATM), characterized by repeated sequences of excavation, securing, and idle periods, are d
Externí odkaz:
https://doaj.org/article/fa174a0f5c134351ba40372b71d2828f
Publikováno v:
Applied Sciences, Vol 12, Iss 17, p 8532 (2022)
In engineering practice, numerical simulations of deep tunneling are commonly based on isotropic linear–elastic perfectly plastic rock models. Rock, however, commonly exhibits highly nonlinear and distinct direction-dependent mechanical behavior. T
Externí odkaz:
https://doaj.org/article/48fcabdfaf1a43bb890b5f9f729d8531
Publikováno v:
Materials, Vol 12, Iss 11, p 1745 (2019)
The durability and serviceability of concrete structures is influenced by both the early-age behavior of concrete as well as its long-term response in terms of shrinkage and creep. Hygro-thermo-chemo-mechanical models, as they are used in the present
Externí odkaz:
https://doaj.org/article/c3c4a050a3634fa59f8553504abbc5a8
Publikováno v:
Materials, Vol 12, Iss 5, p 791 (2019)
Hygro-thermo-chemo-mechanical modelling of time-dependent concrete behavior requires the accurate determination of a large set of parameters. In this paper, the parameters of a multiphase model are calibrated based on a comprehensive set of experimen
Externí odkaz:
https://doaj.org/article/c915c45780b843b9a871413b347d7bc9
Publikováno v:
Applied Sciences, Vol 8, Iss 6, p 1004 (2018)
In the present publication, the performance of an implicit gradient-enhanced damage-plasticity model is evaluated with special focus on the prediction of complex failure modes such as shear failure. Hence, it complements studies on predominant mode I
Externí odkaz:
https://doaj.org/article/c2cb3614b2bf430cb2af3f9a159fef96
Publikováno v:
Materials, Vol 11, Iss 6, p 993 (2018)
The present contribution deals with the experimental investigation of the time-dependent behavior of a typical overlay concrete subjected to tensile stresses. The latter develop in concrete overlays, which are placed on existing concrete structures a
Externí odkaz:
https://doaj.org/article/a895b305894c45f29b0a9c210b1d08db
Publikováno v:
Materials, Vol 11, Iss 1, p 135 (2018)
The authors would like to correct following typing errors: For (3) and (4), the correct expressions are given as[...]
Externí odkaz:
https://doaj.org/article/eefad12e54094e95aae1713ca04e0365
Publikováno v:
Materials, Vol 10, Iss 9, p 1067 (2017)
A new experimental program, focusing on the evolution of the Young’s modulus, uniaxial compressive strength, shrinkage and creep of shotcrete is presented. The laboratory tests are, starting at very young ages of the material, conducted on two diff
Externí odkaz:
https://doaj.org/article/d2227f5ad9d24eb7b57c45b676ac2fb5
Publikováno v:
Materials, Vol 10, Iss 6, p 577 (2017)
The aim of the present paper is to investigate the influence of the constitutive model for shotcrete on the predicted displacements and stresses in shotcrete shells of deep tunnels. Previously proposed shotcrete models as well as a new extended damag
Externí odkaz:
https://doaj.org/article/e79c7a07f05248888e0c0d0779ba0bec
Publikováno v:
Materials, Vol 10, Iss 1, p 82 (2017)
The aims of the present paper are (i) to briefly review single-field and multi-field shotcrete models proposed in the literature; (ii) to propose the extension of a damage-plasticity model for concrete to shotcrete; and (iii) to evaluate the capabili
Externí odkaz:
https://doaj.org/article/79d93d4a46514d488a87c6b2a7e005bb