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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 3 (September 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

5 Articles
access type Accès libre

Estimation of the Statistical Distribution Used in Hydrology Using Kernel Functions

Publié en ligne: 12 Oct 2013
Pages: 1 - 7

Résumé

Abstract

In this paper we will study the statistical distributions for the extreme discharges of the Danube River using kernel functions. We will also compare the results with those obtained using classical cumulative distribution functions (Pareto, Weibull, etc).

Mots clés

  • kernels
  • discharges
  • cumulative distribution functions
  • confidence intervals
  • quantiles
access type Accès libre

Expected Direct Seismic Losses Assessment Using Gis. Case Study for Iaşi Municipality

Publié en ligne: 12 Oct 2013
Pages: 8 - 14

Résumé

Abstract

Expected direct seismic losses assessment is performed on probabilistic basis using world-wide accepted methodologies for two study areas located in Iasi Municipality. The probabilistic assessment refers to the following issues: site-dependent seismic hazard, expected seismic response of buildings, seismic fragility of structures, expected seismic damage. The analysis of the spatial distribution of the existing building stock as well as the presentation of the results on expected direct seismic losses are performed using geographic information systems (GIS)

Mots clés

  • hazard
  • fragility
  • risk
  • losses
  • seismic
access type Accès libre

Influence of Granulometric Cement Characteristics on the Uniformity Degree

Publié en ligne: 12 Oct 2013
Pages: 15 - 24

Résumé

Abstract

In industrial practice, the dimensional characterization of the polygranular materials can be done, experimentally and/or by calculation, on the basis of various types of granulometric distribution laws, of the different types of diameters, of the specific surface and of some indicators related to the granulometric uniformity. This paper aims at introducing a new indicator, called granulometric uniformity degree, defined on the basis of some informational statistics elements, and calculated in a unique way, different from any particular type of granulometric distribution. At the same time, a series of correlations between the granulometric uniformity degree and different characteristic diameters is pointed out, i.e. the specific surface of cements, characterized by the Rosin-Rammler-Sperling ganulometric distribution.

Keywords

  • polygranular material
  • characteristic diameters
  • specific surface
access type Accès libre

Practical Aspects Concerning Nonlinear Dynamic Analysis of Cable Structures

Publié en ligne: 12 Oct 2013
Pages: 25 - 31

Résumé

Abstract

The paper is about some aspects concerning the nonlinear dynamic analysis of prestressed cable structures. A method for the assessment of the tangent stiffness matrix and of the nonlinear parameters is proposed. The methodology is similar to the one described by P. Krishna. The Newmark method is used to integrate the motion equation. In the final section of the paper a comparison between the output supplied by the software of the presented method is made, with constant stiffness matrix(linear) and with the non-linear matrix updated step by step (geometric non-linear). The elements used for comparison are the displacement and velocity response of a given pretensioned cable structure.

Keywords

  • prestressed cable
  • dynamic analysis
  • stiffness matrix
  • Newmark method
access type Accès libre

In Plane Cyclic Behavior of Masonry Walls Jacketed with Fiber Reinforced Mortar and Fiber Grids

Publié en ligne: 12 Oct 2013
Pages: 32 - 39

Résumé

Abstract

Masonry buildings represent the most vulnerable part of the building stock to seismic action in Romania. The main goal of this experimental research program is to investigate the efficiency of several retrofitting solutions using fiber reinforced polymers. Research focused on the lateral strength and displacement capacity of the retrofitted specimens. The masonry walls were built using solid bricks. Glass or carbon fiber reinforced polymers (GFRP or CFRP) embedded in a fiber reinforced mortar layer were used for jacketing. Seven specimens having essentially 25cm width, 1,75m height and 2,10m length were tested in the experimental research program. These specimens were subjected to a constant vertical compressive stress of 1,2MPa. A quasi-static load protocol was considered for the horizontal loading. This paper presents the layout of the experimental research program and some preliminary results.

Keywords

  • seismic
  • fiber reinforced mortar
  • glass/carbon fiber grids
5 Articles
access type Accès libre

Estimation of the Statistical Distribution Used in Hydrology Using Kernel Functions

Publié en ligne: 12 Oct 2013
Pages: 1 - 7

Résumé

Abstract

In this paper we will study the statistical distributions for the extreme discharges of the Danube River using kernel functions. We will also compare the results with those obtained using classical cumulative distribution functions (Pareto, Weibull, etc).

Mots clés

  • kernels
  • discharges
  • cumulative distribution functions
  • confidence intervals
  • quantiles
access type Accès libre

Expected Direct Seismic Losses Assessment Using Gis. Case Study for Iaşi Municipality

Publié en ligne: 12 Oct 2013
Pages: 8 - 14

Résumé

Abstract

Expected direct seismic losses assessment is performed on probabilistic basis using world-wide accepted methodologies for two study areas located in Iasi Municipality. The probabilistic assessment refers to the following issues: site-dependent seismic hazard, expected seismic response of buildings, seismic fragility of structures, expected seismic damage. The analysis of the spatial distribution of the existing building stock as well as the presentation of the results on expected direct seismic losses are performed using geographic information systems (GIS)

Mots clés

  • hazard
  • fragility
  • risk
  • losses
  • seismic
access type Accès libre

Influence of Granulometric Cement Characteristics on the Uniformity Degree

Publié en ligne: 12 Oct 2013
Pages: 15 - 24

Résumé

Abstract

In industrial practice, the dimensional characterization of the polygranular materials can be done, experimentally and/or by calculation, on the basis of various types of granulometric distribution laws, of the different types of diameters, of the specific surface and of some indicators related to the granulometric uniformity. This paper aims at introducing a new indicator, called granulometric uniformity degree, defined on the basis of some informational statistics elements, and calculated in a unique way, different from any particular type of granulometric distribution. At the same time, a series of correlations between the granulometric uniformity degree and different characteristic diameters is pointed out, i.e. the specific surface of cements, characterized by the Rosin-Rammler-Sperling ganulometric distribution.

Keywords

  • polygranular material
  • characteristic diameters
  • specific surface
access type Accès libre

Practical Aspects Concerning Nonlinear Dynamic Analysis of Cable Structures

Publié en ligne: 12 Oct 2013
Pages: 25 - 31

Résumé

Abstract

The paper is about some aspects concerning the nonlinear dynamic analysis of prestressed cable structures. A method for the assessment of the tangent stiffness matrix and of the nonlinear parameters is proposed. The methodology is similar to the one described by P. Krishna. The Newmark method is used to integrate the motion equation. In the final section of the paper a comparison between the output supplied by the software of the presented method is made, with constant stiffness matrix(linear) and with the non-linear matrix updated step by step (geometric non-linear). The elements used for comparison are the displacement and velocity response of a given pretensioned cable structure.

Keywords

  • prestressed cable
  • dynamic analysis
  • stiffness matrix
  • Newmark method
access type Accès libre

In Plane Cyclic Behavior of Masonry Walls Jacketed with Fiber Reinforced Mortar and Fiber Grids

Publié en ligne: 12 Oct 2013
Pages: 32 - 39

Résumé

Abstract

Masonry buildings represent the most vulnerable part of the building stock to seismic action in Romania. The main goal of this experimental research program is to investigate the efficiency of several retrofitting solutions using fiber reinforced polymers. Research focused on the lateral strength and displacement capacity of the retrofitted specimens. The masonry walls were built using solid bricks. Glass or carbon fiber reinforced polymers (GFRP or CFRP) embedded in a fiber reinforced mortar layer were used for jacketing. Seven specimens having essentially 25cm width, 1,75m height and 2,10m length were tested in the experimental research program. These specimens were subjected to a constant vertical compressive stress of 1,2MPa. A quasi-static load protocol was considered for the horizontal loading. This paper presents the layout of the experimental research program and some preliminary results.

Keywords

  • seismic
  • fiber reinforced mortar
  • glass/carbon fiber grids

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