Search Results - "Wichtmann, T."

Long-term deformations of monopile foundations for offshore wind turbines studied with a high-cycle accumulation model by Staubach, P., Wichtmann, T.

“…A parametric study on the long-term deformations of monopile foundations for offshore wind turbines is presented. The finite element calculations of a monopile…”
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Influence of the Grain-Size Distribution Curve of Quartz Sand on the Small Strain Shear Modulus Gmax by Wichtmann, T, Triantafyllidis, T

“…The paper presents a study of the influence of grain-size distribution curve on the small strain shear modulus Gmax of quartz sand with subangular grain shape…”
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Inspection of three sophisticated constitutive models based on monotonic and cyclic tests on fine sand: Hypoplasticity vs. Sanisand vs. ISA by Wichtmann, T., Fuentes, W., Triantafyllidis, T.

“…The prediction quality of three of the most sophisticated constitutive models for sands has been examined based on a comparison of results from element test…”
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Investigation of three sophisticated constitutive soil models: From numerical formulations to element tests and the analysis of vibratory pile driving tests by Machaček, J., Staubach, P., Tafili, M., Zachert, H., Wichtmann, T.

“…The performance of three advanced constitutive models has been evaluated based on element tests and on a comparative study on the simulation of vibratory pile…”
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On the influence of a non-cohesive fines content on small strain stiffness, modulus degradation and damping of quartz sand by Wichtmann, T., Navarrete Hernández, M.A., Triantafyllidis, T.

“…The influence of a non-cohesive fines content on small-strain shear modulus Gmax, small-strain constrained elastic modulus Mmax, shear modulus degradation…”
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Vibratory pile driving in water-saturated sand: Back-analysis of model tests using a hydro-mechanically coupled CEL method by Staubach, P., Machaček, J., Skowronek, J., Wichtmann, T.

“…The development of a hydro-mechanically coupled Coupled-Eulerian–Lagrangian (CEL) method and its application to the back-analysis of vibratory pile driving…”
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Effect of Uniformity Coefficient on G/Gmax and Damping Ratio of Uniform to Well-Graded Quartz Sands by Wichtmann, T, Triantafyllidis, T

“…AbstractThe modulus degradation curves, G(γ)/Gmax, and the damping ratio, D(γ), of 27 clean quartz sands with specially mixed grain size distribution curves…”
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On the influence of the sample preparation method on strain accumulation in sand under high-cyclic loading by Wichtmann, T., Steller, K., Triantafyllidis, T.

“…A study on the influence of the sample preparation method on the cumulative strains in sand under high-cyclic loading is presented. Numerous drained cyclic…”
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Stiffness and Damping of Clean Quartz Sand with Various Grain-Size Distribution Curves by Wichtmann, T, Triantafyllidis, Th

“…AbstractApproximately 240 resonant column (RC) tests have been performed on 26 clean quartz sands with piecewise linear, gap-graded, S-shaped, and other…”
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Impact of the installation on the long-term cyclic behaviour of piles in sand: A numerical study by Staubach, P., Machaček, J., Moscoso, M.C., Wichtmann, T.

“…The installation process changes the state of the soil in the vicinity of a pile and therefore influences its load-displacement behaviour during the…”
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Back-analysis of model tests on piles in sand subjected to long-term lateral cyclic loading: Impact of the pile installation and application of the HCA model by Staubach, P., Machaček, J., Sharif, R., Wichtmann, T.

“…The back-analysis of model tests on piles subjected to high-cyclic lateral loading using the high-cycle accumulation (HCA) model is presented. The installation…”
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Strain accumulation due to packages of cycles with varying amplitude and/or average stress – On the bundling of cycles and the loss of the cyclic preloading memory by Wichtmann, T., Triantafyllidis, T.

“…In order to predict permanent deformations by means of a high-cycle accumulation (HCA) model, a random cyclic loading, i.e. a loading with frequently changing…”
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Enhancement of a high‐cycle accumulation model by an adaptive strain amplitude and its application to monopile foundations by Staubach, P., Machaček, J., Tschirschky, L., Wichtmann, T.

“…The high‐cycle accumulation (HCA) model by Niemunis et al. allows the prediction of the mechanical response of sand under millions of load cycles . It has…”
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Inspection of a high-cycle accumulation model for sand based on recalculations of a full-scale test on a gravity base foundation for offshore wind turbines by Zachert, H., Wichtmann, T., Kudella, P., Triantafyllidis, T.

“…Offshore wind turbines (OWT) are generally founded on piles or gravity base foundations. Up to now, there is a lack of validated and standardized analysis…”
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Predicting undrained static response of sand with non-plastic fines in terms of equivalent granular state parameter by Porcino, D. D., Diano, V., Triantafyllidis, T., Wichtmann, T.

“…The influence of non-plastic fines on undrained monotonic behaviour of sand was investigated over a wide range of fines content (FC = 0–40%), global void ratio…”
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Improved simplified calibration procedure for a high-cycle accumulation model by Wichtmann, T., Niemunis, A., Triantafyllidis, T.

“…The high-cycle accumulation (HCA) model proposed by Niemunis et al. [16] predicts permanent deformations due to a drained cyclic loading with many small cycles…”
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On the influence of the grain size distribution curve on P-wave velocity, constrained elastic modulus M max and Poisson's ratio of quartz sands by Wichtmann, T., Triantafyllidis, T.

“…The paper presents an experimental study on the influence of the grain size distribution curve on dynamic soil properties. More than 160 resonant column tests…”
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Long-term settlements of a ship lock: Measurements vs. FE-prediction using a high cycle accumulation model by Machaček, J., Wichtmann, T., Zachert, H., Triantafyllidis, Th

“…During their lifetime many geotechnical structures are subject to a high number of repetitive loading cycles with small strain amplitudes, a so-called…”
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On correlations between “dynamic” (small-strain) and “static” (large-strain) stiffness moduli – An experimental investigation on 19 sands and gravels by Wichtmann, T., Kimmig, I., Triantafyllidis, T.

“…Correlations between “dynamic” (small-strain) and “static” (large-strain) stiffness moduli for sand are examined. Such correlations are often used for a…”
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Inspection of a high-cycle accumulation model for large numbers of cycles (N=2 million) by Wichtmann, T., Triantafyllidis, T.

“…The high-cycle accumulation (HCA) model for sand proposed by Niemunis et al. (2005) [16] has been developed based on numerous drained cyclic triaxial tests…”
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