Efficient Analytical Model for Calculation of the Influence Zone inside the Subsoil below Foundations Slabs

This paper presents analytical approaches for evaluating the depth of the influence zone. The model focuses on variations in the ground water table. Referring to [6], the term influence zone is assigned to the region where the load has a substantial influence on the deformation of the soil skeleton. The first approach relies on an analytical solution based on an analysis of the Westergard subspace, assuming an elastic material response. This idea is accompanied by the effect of water pressure on the effective (skeleton) stress state. The approach provides any extremely efficient estimate of the depth of the influence zone. The proposed analytical solution is verified against the finite element analysis, assuming that the material response is driven by the modified Cam clay model. The predicted analytical result is found to be in a good agreement with the numerical solution derived with the help of the ADINA 8.1 general-purpose finite element code. The presented results further suggest that this analytical procedure can be applied to solve the interaction problem of the slab and the subsoil and its progress in the structural process, namely by varying the ground water table.

Numerical Implementation of Isotropic Consolidation of Clayey Soils

This paper reports on implementation of several numerical techniques to solve a set of governing equations resulting from simple one dimensional isotropic consolidation of soils that behave according to the Cam clay model. Three different methods of solving the equations of consolidation, namely the collocation method, the finite volume method and the finite element method, are presented. Apart from evaluating their efficiency, which becomes particularly crucial when implementing these techniques in the framework of an optimization problem aimed at tuning the model parameters, a set of parameters of a Cam clay model driving the time dependent response of the soils (deformation dependent variation of the coefficient of permeability and preconsolidation pressure) is also discussed

Variable Local Moduli of Elasticity as Inputs to FEM-based Models of Beams made from Glued Laminated Timber

The present paper is concerned with the formulation of advanced FEM based models of beams made from glued timber segments. These models account for variable elastic moduli in individual segments and their analysis is based on the application of LHS method. All results from probabilistic calculations are compared with experimental measurements conducted on twenty beams as well as with the FEM results derived for the same beams assuming deterministic analysis with piecewise constant moduli in individual segments. The main contribution of enhanced probabilistic models is seen primarily in the ability to provide cost effective designs of long-span glued timber structures

Numerical Implementation of Isotropic Consolidation of Clayey Soils

This paper reports on implementation of several numerical techniques to solve a set of governing equations resulting from simple one dimensional isotropic consolidation of soils that behave according to the Cam clay model. Three different methods of solving the equations of consolidation, namely the collocation method, the finite volume method and the finite element method, are presented. Apart from evaluating their efficiency, which becomes particularly crucial when implementing these techniques in the framework of an optimization problem aimed at tuning the model parameters, a set of parameters of a Cam clay model driving the time dependent response of the soils (deformation dependent variation of the coefficient of permeability and preconsolidation pressure) is also discussed

Levels in161Tb excited in the decay of 3·6 min161Gd

The decay of161Gd has been studied using Ge(Li) detectors. The single and coincidence gamma-ray spectra were measured. In comparison with the previous studies more precise gammaray energies and relative intensities are reported. Five formerly unreported weak transitions at 97·0, 152·0, 168·0, 346·0 and 417·0 keV have been assigned to the161Gd decay. The properties of excited levels in the161Tb nuclei are discussed in terms of the collective nuclear model. The effect of the Coriolis coupling has been considered. © 1976 Academia, Publishing House of the Czechoslovak Academy of Sciences