Rivista e Edizione

Volume 16 (2021): Edizione 4 (December 2021)

Volume 16 (2021): Edizione 3 (September 2021)

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Volume 15 (2019): Edizione 4 (December 2019)

Volume 15 (2019): Edizione 3 (September 2019)

Volume 15 (2019): Edizione 2 (June 2019)

Volume 15 (2019): Edizione 1 (March 2019)

Volume 14 (2018): Edizione 4 (December 2018)

Volume 14 (2018): Edizione 3 (September 2018)

Volume 14 (2018): Edizione 2 (June 2018)

Volume 14 (2018): Edizione 1 (March 2018)

Volume 13 (2017): Edizione 4 (December 2017)

Volume 13 (2017): Edizione 3 (September 2017)

Volume 13 (2017): Edizione 2 (June 2017)

Volume 13 (2017): Edizione 1 (March 2017)

Volume 12 (2016): Edizione 4 (December 2016)

Volume 12 (2016): Edizione 3 (September 2016)

Volume 12 (2016): Edizione 2 (June 2016)

Volume 12 (2016): Edizione 1 (March 2016)

Volume 11 (2015): Edizione 4 (December 2015)

Volume 11 (2015): Edizione 3 (September 2015)

Volume 11 (2015): Edizione 2 (May 2015)

Volume 11 (2015): Edizione 1 (March 2015)

Volume 10 (2014): Edizione 4 (December 2014)

Volume 10 (2014): Edizione 3 (September 2014)

Volume 10 (2014): Edizione 2 (June 2014)

Volume 10 (2014): Edizione 1 (March 2014)

Volume 9 (2013): Edizione 4 (December 2013)

Volume 9 (2013): Edizione 3 (September 2013)

Volume 9 (2013): Edizione 2 (June 2013)

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

Dettagli della rivista
Formato
Rivista
eISSN
2784-1391
Pubblicato per la prima volta
12 Apr 2013
Periodo di pubblicazione
4 volte all'anno
Lingue
Inglese

Cerca

Volume 11 (2015): Edizione 3 (September 2015)

Dettagli della rivista
Formato
Rivista
eISSN
2784-1391
Pubblicato per la prima volta
12 Apr 2013
Periodo di pubblicazione
4 volte all'anno
Lingue
Inglese

Cerca

5 Articoli
access type Accesso libero

Comparative Study for Buckling Resistance of Steel Sheets Provided with Stiffeners Used in Bridge Structures

Pubblicato online: 29 Oct 2015
Pagine: 1 - 7

Astratto

Abstract

The subject discussed in this paper is based on an experimental bridge model which was built to study the pre-critical and post-critical buckling behaviour of steel webs of box girders provided with longitudinal and transversal stiffeners. The article presents a comparison between the experimental results and the numerical ones for buckling resistance of stiffened steel webs. For this purpose two types of analysis will be carried out: an analysis to establish the values and eigenvectors of buckling, after which the critical factor for the first mode of buckling will be obtained, and then a geometrical and physical nonlinear analysis will be performed.

Parole chiave

  • steel bridges
  • critical buckling analysis
  • nonlinear analysis
access type Accesso libero

Simplified Analytical Methods to Analyze Lock Gates Submitted to Ship Collisions and Earthquakes

Pubblicato online: 29 Oct 2015
Pagine: 8 - 22

Astratto

Abstract

This paper presents two simplified analytical methods to analyze lock gates submitted to two different accidental loads. The case of an impact involving a vessel is first investigated. In this situation, the resistance of the struck gate is evaluated by assuming a local and a global deforming mode. The super-element method is used in the first case, while an equivalent beam model is simultaneously introduced to capture the overall bending motion of the structure. The second accidental load considered in this paper is the seismic action, for which an analytical method is presented to evaluate the total hydrodynamic pressure applied on a lock gate during an earthquake, due account being taken of the fluid-structure interaction. For each of these two actions, numerical validations are presented and the analytical results are compared to finite-element solutions.

Parole chiave

  • super-element method
  • local mode
  • global mode
  • hydrodynamic pressure
  • fluidstructure interaction
access type Accesso libero

Global Ductility of Dual Steel Frames with Replaceable Dissipative Shear Walls

Pubblicato online: 29 Oct 2015
Pagine: 23 - 30

Astratto

Abstract

The paper presents the results of a numerical program that was used to investigate the seismic performance of dual steel frames with dissipative shear walls. Nonlinear static and dynamic analyses were employed in order to evaluate the global ductility and the q factor for a twelve story building. The influence of the q factor on the estimated level of damage and post-earthquake intervention strategy was investigated. The dynamic analyses were conducted using two groups of accelerograms, selected to match the response spectra of two types of grounds. The numerical models were validated against experimental tests. The results show that q factor values adopted in design influence the level of damage. If re-centering capacity is properly controlled by design, the replacement of damaged walls can minimize the time and cost of intervention, thus supporting disaster resilience of buildings

Parole chiave

  • dissipative steel shear wall
  • non-linear analysis
  • global ductility
  • q factor
access type Accesso libero

Analysis of GNSS Data Using Precise Point Positioning Technique for the Determination of Permanent Station in Romania

Pubblicato online: 29 Oct 2015
Pagine: 31 - 37

Astratto

Abstract

To obtain the coordinates by means of precise point positioning (PPP) technique we need to use the undifferenced GPS pseudocode and carrier phase observations but to obtain the “precise” positioning we need precise orbit and clock data too. This products and other information for obtaining the results by using PPP technique on a centimeter level accuracy can be downloaded from different locations, but the most reliable satellite ephemerides and clock correction are available from International GNSS Service (IGS).

In the PPP analysis we determined the parameters such as the receiver clock error, ionospheric delays code biases, code multipath and the total neutral atmosphere delay of the observations. For the determination of the permanent station coordinates, using the PPP technique, we used precise orbit and clock solutions to enable absolute positioning of a single receiver.

In this article we present the results obtained by using the PPP technique on the permanent station Oradea, from which we can conclude that the PPP technique can be used for different GNSS application.

Parole chiave

  • IGS
  • positioning
  • precise orbit
  • clock solutions
access type Accesso libero

Case Study on Vulnerability Increase for a Reinforced Concrete Frame Structure

Pubblicato online: 29 Oct 2015
Pagine: 38 - 45

Astratto

Abstract

Seismic vulnerability for a structure represents the susceptibility to be affected by an event with a given intensity. The vulnerability of a structure can be influenced by the design methods or by different problems that may appear during the execution process.

This paper shows a case study for the vulnerability increase of a reinforced concrete frame structure in 2 different situations:

a) modification produced due to code changes, meaning P100-2006 respectively P100-2013;

b) modifications produced the structure taking into account the errors which have occurred during the execution process;

For both cases, capacity curves were plotted considering the nonlinear analysis, also called pushover. The numerical simulation was performed in SAP2000 software. These curves were compared with the response spectrum corresponding to the site conditions in order to obtain the performance point. For accurate results, fragility curves were plotted for both considered situations, according to previous research of the authors.

The paper emphasizes the importance of each stage during the execution of a structure. More over the differences in the vulnerability index show the importance on the overall behavior of the structure. Solution to increase strength and safety for the structure are also given at the end of the paper

Parole chiave

  • push-over analysis
  • deterministic analysis
  • vulnerability assessment
  • fragility curves
5 Articoli
access type Accesso libero

Comparative Study for Buckling Resistance of Steel Sheets Provided with Stiffeners Used in Bridge Structures

Pubblicato online: 29 Oct 2015
Pagine: 1 - 7

Astratto

Abstract

The subject discussed in this paper is based on an experimental bridge model which was built to study the pre-critical and post-critical buckling behaviour of steel webs of box girders provided with longitudinal and transversal stiffeners. The article presents a comparison between the experimental results and the numerical ones for buckling resistance of stiffened steel webs. For this purpose two types of analysis will be carried out: an analysis to establish the values and eigenvectors of buckling, after which the critical factor for the first mode of buckling will be obtained, and then a geometrical and physical nonlinear analysis will be performed.

Parole chiave

  • steel bridges
  • critical buckling analysis
  • nonlinear analysis
access type Accesso libero

Simplified Analytical Methods to Analyze Lock Gates Submitted to Ship Collisions and Earthquakes

Pubblicato online: 29 Oct 2015
Pagine: 8 - 22

Astratto

Abstract

This paper presents two simplified analytical methods to analyze lock gates submitted to two different accidental loads. The case of an impact involving a vessel is first investigated. In this situation, the resistance of the struck gate is evaluated by assuming a local and a global deforming mode. The super-element method is used in the first case, while an equivalent beam model is simultaneously introduced to capture the overall bending motion of the structure. The second accidental load considered in this paper is the seismic action, for which an analytical method is presented to evaluate the total hydrodynamic pressure applied on a lock gate during an earthquake, due account being taken of the fluid-structure interaction. For each of these two actions, numerical validations are presented and the analytical results are compared to finite-element solutions.

Parole chiave

  • super-element method
  • local mode
  • global mode
  • hydrodynamic pressure
  • fluidstructure interaction
access type Accesso libero

Global Ductility of Dual Steel Frames with Replaceable Dissipative Shear Walls

Pubblicato online: 29 Oct 2015
Pagine: 23 - 30

Astratto

Abstract

The paper presents the results of a numerical program that was used to investigate the seismic performance of dual steel frames with dissipative shear walls. Nonlinear static and dynamic analyses were employed in order to evaluate the global ductility and the q factor for a twelve story building. The influence of the q factor on the estimated level of damage and post-earthquake intervention strategy was investigated. The dynamic analyses were conducted using two groups of accelerograms, selected to match the response spectra of two types of grounds. The numerical models were validated against experimental tests. The results show that q factor values adopted in design influence the level of damage. If re-centering capacity is properly controlled by design, the replacement of damaged walls can minimize the time and cost of intervention, thus supporting disaster resilience of buildings

Parole chiave

  • dissipative steel shear wall
  • non-linear analysis
  • global ductility
  • q factor
access type Accesso libero

Analysis of GNSS Data Using Precise Point Positioning Technique for the Determination of Permanent Station in Romania

Pubblicato online: 29 Oct 2015
Pagine: 31 - 37

Astratto

Abstract

To obtain the coordinates by means of precise point positioning (PPP) technique we need to use the undifferenced GPS pseudocode and carrier phase observations but to obtain the “precise” positioning we need precise orbit and clock data too. This products and other information for obtaining the results by using PPP technique on a centimeter level accuracy can be downloaded from different locations, but the most reliable satellite ephemerides and clock correction are available from International GNSS Service (IGS).

In the PPP analysis we determined the parameters such as the receiver clock error, ionospheric delays code biases, code multipath and the total neutral atmosphere delay of the observations. For the determination of the permanent station coordinates, using the PPP technique, we used precise orbit and clock solutions to enable absolute positioning of a single receiver.

In this article we present the results obtained by using the PPP technique on the permanent station Oradea, from which we can conclude that the PPP technique can be used for different GNSS application.

Parole chiave

  • IGS
  • positioning
  • precise orbit
  • clock solutions
access type Accesso libero

Case Study on Vulnerability Increase for a Reinforced Concrete Frame Structure

Pubblicato online: 29 Oct 2015
Pagine: 38 - 45

Astratto

Abstract

Seismic vulnerability for a structure represents the susceptibility to be affected by an event with a given intensity. The vulnerability of a structure can be influenced by the design methods or by different problems that may appear during the execution process.

This paper shows a case study for the vulnerability increase of a reinforced concrete frame structure in 2 different situations:

a) modification produced due to code changes, meaning P100-2006 respectively P100-2013;

b) modifications produced the structure taking into account the errors which have occurred during the execution process;

For both cases, capacity curves were plotted considering the nonlinear analysis, also called pushover. The numerical simulation was performed in SAP2000 software. These curves were compared with the response spectrum corresponding to the site conditions in order to obtain the performance point. For accurate results, fragility curves were plotted for both considered situations, according to previous research of the authors.

The paper emphasizes the importance of each stage during the execution of a structure. More over the differences in the vulnerability index show the importance on the overall behavior of the structure. Solution to increase strength and safety for the structure are also given at the end of the paper

Parole chiave

  • push-over analysis
  • deterministic analysis
  • vulnerability assessment
  • fragility curves

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