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Zeitschriftendaten
Format
Zeitschrift
eISSN
1338-3973
ISSN
1338-3973
Erstveröffentlichung
23 May 2011
Erscheinungsweise
4 Hefte pro Jahr
Sprachen
Englisch

Suche

Volumen 21 (2013): Heft 3 (September 2013)

Zeitschriftendaten
Format
Zeitschrift
eISSN
1338-3973
ISSN
1338-3973
Erstveröffentlichung
23 May 2011
Erscheinungsweise
4 Hefte pro Jahr
Sprachen
Englisch

Suche

5 Artikel
access type Uneingeschränkter Zugang

Some Remarks on the Choice of Ductility Class for Earthquake-Resistant Steel Structures

Online veröffentlicht: 08 Oct 2013
Seitenbereich: 1 - 10

Zusammenfassung

Abstract

The implementation of the Eurocodes in current structural design practice has brought about a new emphasis on the design of earthquake-resistant structures. In some European countries, new earthquake zones have been defined; henceforth, the design requirements of many ongoing projects have changed as well. The choice of the ductility class of steel structures as one of the key design parameters, the consequences of this choice on design procedure, and some applications of the Eurocode 8 design criteria by comparing French and Slovak national practice are discussed, using a practical example of a structure.

Schlüsselwörter

  • Earthquake-resistant design
  • ductility
  • steel structure
  • Eurocode 8
access type Uneingeschränkter Zugang

Can Material Pits in the Vicinity of a Polder Threaten its Safety?

Online veröffentlicht: 08 Oct 2013
Seitenbereich: 11 - 18

Zusammenfassung

Abstract

The frequent occurrence of floods recently has motivated discussions by experts on reviewing the safety of flood protection structures. The simulation of flood discharges belongs among transient flow tasks. Due to the randomness of the phenomenon, as well as the often unknown geological composition of the environment in which the flooding occurs, this question has become very complicated. The finite element method (FEM) is one of the methods for reviewing risk factors endangering the stability of hydraulic structures. In this article the application of FEM is mentioned in assessing the stability of the subsoil of the Borša polder in Slovakia.

Schlüsselwörter

  • Flood
  • polder
  • subsoil
  • uplift
  • filtration velocity
  • safety
  • finite element method
access type Uneingeschränkter Zugang

Silo with a Corrugated Sheet Wall

Online veröffentlicht: 08 Oct 2013
Seitenbereich: 19 - 30

Zusammenfassung

Abstract

Silos and tanks are currently being used to create reserves of stored materials. Their importance is based on balancing the production and consumption of bulk materials to establish an adequate reserve throughout the year. The case study introduced within the framework of this paper focuses on thin-walled silos made of corrugated sheets and on an approach for designing these types of structures. The storage of bulk materials causes compression or tensile stresses in the walls of a silo structure. The effect of a frictional force in the silo walls creates an additional bending moment in a wave, which ultimately affects the resulting bending moments. Several mathematical and physical models were used in order to examine various types of loading and their effects on a structure. Subsequently, the accuracy of the computational models was verified by experimental measurements on a grain silo in Bojničky, Slovakia. A comparison of the experimental and mathematical models shows a reasonable match and confirms the load specifications, while indicating that the mathematical model was correct.

Schlüsselwörter

  • Thin-walled silo
  • corrugated sheet
  • bulk material
  • horizontal pressure
  • friction in a wall
access type Uneingeschränkter Zugang

Parameters Influencing the Response of a Base-Isolated Building

Online veröffentlicht: 08 Oct 2013
Seitenbereich: 31 - 42

Zusammenfassung

Abstract

In order to illustrate the effect of damping on the response of a base-isolated building, a large investigation was undertaken. It consists of a parametric study, which takes into account the progressive variation of the damping ratio (10% to 30%) under different seismic excitations. Using a time history analysis of displacements and accelerations at various levels of the building, the results show that the efficiency of the isolator increases with the assumed damping ratio, provided that the latter is less than or equal to 20%. Beyond this value, the isolator becomes less useful.

Schlüsselwörter

  • Damping
  • base isolation
  • LRB
  • seismic excitation
  • hysteresis
access type Uneingeschränkter Zugang

An Analysis of Regional Snow Assessments at Selected Hydrological Stations on the Danube and Tisza Rivers

Online veröffentlicht: 08 Oct 2013
Seitenbereich: 43 - 56

Zusammenfassung

Abstract

Precipitation falling on a land surface is one of the most important elements of the hydrological cycle, and it is the only input term of the water balance on the Earth´s surface. On those areas of the Earth where a part of the annual precipitation falls in the form of snow, the rhythm of the hydrological cycle, i.e., the water balance within a year, follows a pattern that deviates from that of the precipitation record. Precipitation falling in a solid state enters the hydrological cycle with a time lag that might be as much as several months after the precipitation event. Therefore, instead of considering the observed values of precipitation when describing the various elements of the hydrological cycle, it is more expedient to take the surface water input into account. This is a fraction of the precipitation which is present on the land surface in a liquid state. Consequently, the most important task of the various snow models within the rainfall - runoff and water budget schemes is to transform the precipitation values observed into surface water input values. Spring time runoff largely depends on the snowmelt component, and it gives the possibility of estimating the expected seasonal volume of the flow and flood peaks. Seasonal forecasts based on the relationship between snow resources and expected precipitation during the spring months have been analyzed for the Danube and Tisza rivers.

Schlüsselwörter

  • HOLV snowmelt model
  • early warning
  • spring floods
5 Artikel
access type Uneingeschränkter Zugang

Some Remarks on the Choice of Ductility Class for Earthquake-Resistant Steel Structures

Online veröffentlicht: 08 Oct 2013
Seitenbereich: 1 - 10

Zusammenfassung

Abstract

The implementation of the Eurocodes in current structural design practice has brought about a new emphasis on the design of earthquake-resistant structures. In some European countries, new earthquake zones have been defined; henceforth, the design requirements of many ongoing projects have changed as well. The choice of the ductility class of steel structures as one of the key design parameters, the consequences of this choice on design procedure, and some applications of the Eurocode 8 design criteria by comparing French and Slovak national practice are discussed, using a practical example of a structure.

Schlüsselwörter

  • Earthquake-resistant design
  • ductility
  • steel structure
  • Eurocode 8
access type Uneingeschränkter Zugang

Can Material Pits in the Vicinity of a Polder Threaten its Safety?

Online veröffentlicht: 08 Oct 2013
Seitenbereich: 11 - 18

Zusammenfassung

Abstract

The frequent occurrence of floods recently has motivated discussions by experts on reviewing the safety of flood protection structures. The simulation of flood discharges belongs among transient flow tasks. Due to the randomness of the phenomenon, as well as the often unknown geological composition of the environment in which the flooding occurs, this question has become very complicated. The finite element method (FEM) is one of the methods for reviewing risk factors endangering the stability of hydraulic structures. In this article the application of FEM is mentioned in assessing the stability of the subsoil of the Borša polder in Slovakia.

Schlüsselwörter

  • Flood
  • polder
  • subsoil
  • uplift
  • filtration velocity
  • safety
  • finite element method
access type Uneingeschränkter Zugang

Silo with a Corrugated Sheet Wall

Online veröffentlicht: 08 Oct 2013
Seitenbereich: 19 - 30

Zusammenfassung

Abstract

Silos and tanks are currently being used to create reserves of stored materials. Their importance is based on balancing the production and consumption of bulk materials to establish an adequate reserve throughout the year. The case study introduced within the framework of this paper focuses on thin-walled silos made of corrugated sheets and on an approach for designing these types of structures. The storage of bulk materials causes compression or tensile stresses in the walls of a silo structure. The effect of a frictional force in the silo walls creates an additional bending moment in a wave, which ultimately affects the resulting bending moments. Several mathematical and physical models were used in order to examine various types of loading and their effects on a structure. Subsequently, the accuracy of the computational models was verified by experimental measurements on a grain silo in Bojničky, Slovakia. A comparison of the experimental and mathematical models shows a reasonable match and confirms the load specifications, while indicating that the mathematical model was correct.

Schlüsselwörter

  • Thin-walled silo
  • corrugated sheet
  • bulk material
  • horizontal pressure
  • friction in a wall
access type Uneingeschränkter Zugang

Parameters Influencing the Response of a Base-Isolated Building

Online veröffentlicht: 08 Oct 2013
Seitenbereich: 31 - 42

Zusammenfassung

Abstract

In order to illustrate the effect of damping on the response of a base-isolated building, a large investigation was undertaken. It consists of a parametric study, which takes into account the progressive variation of the damping ratio (10% to 30%) under different seismic excitations. Using a time history analysis of displacements and accelerations at various levels of the building, the results show that the efficiency of the isolator increases with the assumed damping ratio, provided that the latter is less than or equal to 20%. Beyond this value, the isolator becomes less useful.

Schlüsselwörter

  • Damping
  • base isolation
  • LRB
  • seismic excitation
  • hysteresis
access type Uneingeschränkter Zugang

An Analysis of Regional Snow Assessments at Selected Hydrological Stations on the Danube and Tisza Rivers

Online veröffentlicht: 08 Oct 2013
Seitenbereich: 43 - 56

Zusammenfassung

Abstract

Precipitation falling on a land surface is one of the most important elements of the hydrological cycle, and it is the only input term of the water balance on the Earth´s surface. On those areas of the Earth where a part of the annual precipitation falls in the form of snow, the rhythm of the hydrological cycle, i.e., the water balance within a year, follows a pattern that deviates from that of the precipitation record. Precipitation falling in a solid state enters the hydrological cycle with a time lag that might be as much as several months after the precipitation event. Therefore, instead of considering the observed values of precipitation when describing the various elements of the hydrological cycle, it is more expedient to take the surface water input into account. This is a fraction of the precipitation which is present on the land surface in a liquid state. Consequently, the most important task of the various snow models within the rainfall - runoff and water budget schemes is to transform the precipitation values observed into surface water input values. Spring time runoff largely depends on the snowmelt component, and it gives the possibility of estimating the expected seasonal volume of the flow and flood peaks. Seasonal forecasts based on the relationship between snow resources and expected precipitation during the spring months have been analyzed for the Danube and Tisza rivers.

Schlüsselwörter

  • HOLV snowmelt model
  • early warning
  • spring floods

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