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Volume 9 (2013): Edition 1 (March 2013)

Détails du magazine
Format
Magazine
eISSN
2784-1391
ISSN
2066-6934
Première publication
12 Apr 2013
Période de publication
4 fois par an
Langues
Anglais

Chercher

Volume 9 (2013): Edition 1 (March 2013)

Détails du magazine
Format
Magazine
eISSN
2784-1391
ISSN
2066-6934
Première publication
12 Apr 2013
Période de publication
4 fois par an
Langues
Anglais

Chercher

4 Articles
Accès libre

Comparative Study of Codes for Seismic Design of Structures

Publié en ligne: 12 Apr 2013
Pages: 1 - 12

Résumé

Abstract

This paper presents a comparative evaluation among some international, European and American, seismic design standards. The study considers the criteria for the analysis of conventional (residential and commercial) buildings. The study is focused on some critical topics: definition of the recurrence periods for establishing the seismic input; definition of the seismic zonation and shape of the design response spectra; consideration of local soil conditions; definition of the seismic force-resisting systems and respective response modification coefficients; definition of the allowable procedures for the seismic analysis. A model for a standard reinforced concrete building (“Model Building”) has been developed to permit the comparison among codes. This building has been modelled with two different computer programs, SAP2000 and SOFiSTiK and subjected to seismic input according to the several seismic codes. The obtained results compared are leading to some important conclusions.

Keywords

  • seismic analysis
  • seismic standards
  • comparative analysis
  • modelling
Accès libre

Bayes Signification Tests in Linear Regression and Economic Applications

Publié en ligne: 12 Apr 2013
Pages: 13 - 26

Résumé

Abstract

In this paper we will use the statistical inference, in particular the Bayes tests for the signification of the parameters of linear regression. We will consider the cases of known variance, and unknown variance respectively. Because we replace the Student tests by the Z tests in practice if the involved number of degrees of freedom is at least 30 , we can replace the case of unknown variance with that of known variance in our paper, if the above number of degrees of freedom is at least 30 . Because in economics we generally know the signs of the involved parameters, in practice the one-sided parametric tests are used. However, in this paper we will refer also to the two-sided Bayes test.

Mots clés

  • Bayes test
  • signification test
  • two-sided test
  • left test
  • right test
  • wages
  • saving
Accès libre

Numerical Study on Temporal Domain Discretizing for Hydrogeological Modeling Practices

Publié en ligne: 12 Apr 2013
Pages: 27 - 41

Résumé

Abstract

One of the key operations in the construction of hydrogeological models is the transformation of continuous physical systems into discrete models while conserving the aimed model performance level and optimizing the available resources. Such operation is called discretization, and it has to be applied to both spatial and temporal domains in hydrogeology. The present paper deals with the temporal domain discretization. A literature review is given first, and then a parametric study (using 1D flow modeling) is conducted to assess the effects induced by boundary conditions (specified head or specified recharge rate), data temporal resolution and model simulation time step on hydrogeological flow model performances. It was found that the effect induced by the dynamic comportment of a recharge rate boundary condition type is more important than that due to a specified head. For the recharge rate, the time step must be smaller or equal to the data resolution when using Modflow. As for a specified head boundary condition type, it was recommended to take a time step satisfying Δt∞1/(K × Δh).

Keywords

  • hydrogeological modeling
  • temporal domain discretizing
  • data temporal resolution
  • simulation time step
Accès libre

Structural analisys of concrete pre-stressed reservoirs for sludge fermentation – water waste treatment plant bucharest – glina. numerical fem assessment of the structural response for static in-duty loads

Publié en ligne: 12 Apr 2013
Pages: 42 - 58

Résumé

Abstract

The paper refers to a structural finite element analysis on the reservoirs for sludge fermentation subjected to static in-duty loads, at Glina Water Waste Treatment Plant. The purpose was to assess the stress and deformation states in subsequent erection and service conditions, to verify the design provisions and to emphasize the sensitivities, for a structure which was designed in the ‘80s based on analytical procedures. The results obtained on the numerical models highlight the importance of the soil-structure interaction, in peculiar the one influenced by the soil mass deformability, on the overall structural response. Based on the calculated stresses, all structural components were verified according to the actual design codes at the ultimate limit state and the service limit state (water tightness/crack emergence).

Keywords

  • numerical modeling
  • pre-stressed concrete structure
  • soil-structure interaction
4 Articles
Accès libre

Comparative Study of Codes for Seismic Design of Structures

Publié en ligne: 12 Apr 2013
Pages: 1 - 12

Résumé

Abstract

This paper presents a comparative evaluation among some international, European and American, seismic design standards. The study considers the criteria for the analysis of conventional (residential and commercial) buildings. The study is focused on some critical topics: definition of the recurrence periods for establishing the seismic input; definition of the seismic zonation and shape of the design response spectra; consideration of local soil conditions; definition of the seismic force-resisting systems and respective response modification coefficients; definition of the allowable procedures for the seismic analysis. A model for a standard reinforced concrete building (“Model Building”) has been developed to permit the comparison among codes. This building has been modelled with two different computer programs, SAP2000 and SOFiSTiK and subjected to seismic input according to the several seismic codes. The obtained results compared are leading to some important conclusions.

Keywords

  • seismic analysis
  • seismic standards
  • comparative analysis
  • modelling
Accès libre

Bayes Signification Tests in Linear Regression and Economic Applications

Publié en ligne: 12 Apr 2013
Pages: 13 - 26

Résumé

Abstract

In this paper we will use the statistical inference, in particular the Bayes tests for the signification of the parameters of linear regression. We will consider the cases of known variance, and unknown variance respectively. Because we replace the Student tests by the Z tests in practice if the involved number of degrees of freedom is at least 30 , we can replace the case of unknown variance with that of known variance in our paper, if the above number of degrees of freedom is at least 30 . Because in economics we generally know the signs of the involved parameters, in practice the one-sided parametric tests are used. However, in this paper we will refer also to the two-sided Bayes test.

Mots clés

  • Bayes test
  • signification test
  • two-sided test
  • left test
  • right test
  • wages
  • saving
Accès libre

Numerical Study on Temporal Domain Discretizing for Hydrogeological Modeling Practices

Publié en ligne: 12 Apr 2013
Pages: 27 - 41

Résumé

Abstract

One of the key operations in the construction of hydrogeological models is the transformation of continuous physical systems into discrete models while conserving the aimed model performance level and optimizing the available resources. Such operation is called discretization, and it has to be applied to both spatial and temporal domains in hydrogeology. The present paper deals with the temporal domain discretization. A literature review is given first, and then a parametric study (using 1D flow modeling) is conducted to assess the effects induced by boundary conditions (specified head or specified recharge rate), data temporal resolution and model simulation time step on hydrogeological flow model performances. It was found that the effect induced by the dynamic comportment of a recharge rate boundary condition type is more important than that due to a specified head. For the recharge rate, the time step must be smaller or equal to the data resolution when using Modflow. As for a specified head boundary condition type, it was recommended to take a time step satisfying Δt∞1/(K × Δh).

Keywords

  • hydrogeological modeling
  • temporal domain discretizing
  • data temporal resolution
  • simulation time step
Accès libre

Structural analisys of concrete pre-stressed reservoirs for sludge fermentation – water waste treatment plant bucharest – glina. numerical fem assessment of the structural response for static in-duty loads

Publié en ligne: 12 Apr 2013
Pages: 42 - 58

Résumé

Abstract

The paper refers to a structural finite element analysis on the reservoirs for sludge fermentation subjected to static in-duty loads, at Glina Water Waste Treatment Plant. The purpose was to assess the stress and deformation states in subsequent erection and service conditions, to verify the design provisions and to emphasize the sensitivities, for a structure which was designed in the ‘80s based on analytical procedures. The results obtained on the numerical models highlight the importance of the soil-structure interaction, in peculiar the one influenced by the soil mass deformability, on the overall structural response. Based on the calculated stresses, all structural components were verified according to the actual design codes at the ultimate limit state and the service limit state (water tightness/crack emergence).

Keywords

  • numerical modeling
  • pre-stressed concrete structure
  • soil-structure interaction

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