Zeitschriften und Ausgaben

Volumen 23 (2021): Heft 1 (December 2021)

Volumen 22 (2020): Heft 1 (December 2020)

Volumen 21 (2019): Heft 1 (December 2019)

Volumen 20 (2018): Heft 1 (December 2018)

Volumen 19 (2017): Heft 1 (December 2017)

Zeitschriftendaten
Format
Zeitschrift
eISSN
2392-6139
Erstveröffentlichung
01 Dec 2017
Erscheinungsweise
1 Hefte pro Jahr
Sprachen
Englisch

Suche

Volumen 21 (2019): Heft 1 (December 2019)

Zeitschriftendaten
Format
Zeitschrift
eISSN
2392-6139
Erstveröffentlichung
01 Dec 2017
Erscheinungsweise
1 Hefte pro Jahr
Sprachen
Englisch

Suche

15 Artikel
Uneingeschränkter Zugang

Coastal Processes and Longshore Sediment Transport along Zemmouri Bay, Central East Coast of Algeria

Online veröffentlicht: 21 Jan 2020
Seitenbereich: 7 - 15

Zusammenfassung

Abstract

The coastline of Zemmouri Bay on the northeast coast of Algeria with about 50 km of shoreline has been eroding since 1970. Changes of the sandy shoreline are continuous and occur at diverse spatial and temporal scales. This erosion is a major crisis and it potentially impacts the coastal population and natural environment. In order to understand and predict these morphological changes, an accurate description of sediment transport by waves and currents and shoreline change is important. This paper presents a comprehensive study of wave refraction, current-driven sediment transport and shoreline change. Results show that the study area exhibits a great variety of shoreline evolution trends, with erosion prevailing in the eastern and central sectors and stability or even accretion in the Western area.

Schlüsselwörter

  • Zemmouri Bay
  • sediment transport
  • shoreline
  • hydrodynamic
  • coastal process
Uneingeschränkter Zugang

Study on the Non-Compliant Landfill from Bârlad in Vaslui County

Online veröffentlicht: 21 Jan 2020
Seitenbereich: 17 - 24

Zusammenfassung

Abstract

This paper presents a part of a comprehensive study on non-compliant landfill in Vaslui County. We have been tracking the subsidences taking place in the body of waste dumps and the amount of gas removed to take the best post-closure monitoring measures. In order to trace the behavior regarding the subsidence in the landfill body, there were placed in the ground 11 milestones/topographic landmarks of plastics, painted in white and red to be easily identified visually. Keeping them on the same positions made possible the analysis in the present study. Topographic surveys in the ground were performed once a month between April 2014 and September 2015. The results, interpretations and proposed solutions are presented in this paper.

Schlüsselwörter

  • landfill
  • modeling
  • settling
Uneingeschränkter Zugang

The Specifics of Use of Composite Materials in Consolidation of Historical Monuments

Online veröffentlicht: 21 Jan 2020
Seitenbereich: 25 - 33

Zusammenfassung

Abstract

The use of composite systems in protecting, preserving and maintaining historical monuments has become more and more used. There are several consolidation procedures with fiber-reinforced polymeric polymers that can be applied as required or on the basis of the basic material (concrete, masonry, wood, etc.). Besides the many advantages it provides, the application of composite systems in the rehabilitation of heritage buildings and historical monuments requires minimal workmanship. More and more cities are actively involved in the rehabilitation and preservation of heritage buildings and historical monuments by launching good practice guides to preserve local cultural heritage by applying composite elements as robust as possible without the need to modify the overall dimensions of the buildings through a classic covering.

Schlüsselwörter

  • composite materials
  • consolidation
  • historical monuments
Uneingeschränkter Zugang

Proper Infrastructure Design at High Vertical Loads, Nearby Waterfront Structures

Online veröffentlicht: 21 Jan 2020
Seitenbereich: 35 - 43

Zusammenfassung

Abstract

Hence economic growth requires more and more investments in the harbor area, especially nearby waterfront structures, a special attention must be taken into account regarding proper infrastructure design for structures with high vertical loads. At the same time, we have to consider the good behavior of the new design structures and also their impact on the existing nearby waterfront infrastructure. Being adjacent to waterfront structures and due to the limited available space, these structures are typically tall and narrow, and exert average soil pressures on the order of 300KPa. These loads can only be accommodated by ground with an adequate bearing capacity. This publication presents case studies of waterfront projects like grain silos storage facility. Available results for the certification and monitoring of the works are also presented, as well as other considerations based on the author’s experience.

Schlüsselwörter

  • proper infrastructure design
  • structures with high vertical loads
  • waterfront projects
Uneingeschränkter Zugang

Business Management Strategies for Business Development. Organization of the Territory and Planning of Construction Works

Online veröffentlicht: 21 Jan 2020
Seitenbereich: 45 - 50

Zusammenfassung

Abstract

In order for a project to be built with respect to quality, budget compliance and execution time - all required conditions, a professional management of site-level operations is required. The technical complexity, the importance of performing the work on the set deadline, the resource constraints and the substantial costs require the planning, programming and rigorous control of all the works.

Schlüsselwörter

  • business sustainability
  • optimization
  • planning
  • spatial planning
Uneingeschränkter Zugang

GPR Application for Risks Detection in Subsurface Engineering Construction Projects

Online veröffentlicht: 21 Jan 2020
Seitenbereich: 51 - 58

Zusammenfassung

Abstract

The aim of this work is to study and explore the causes of the landslide in different locations using Ground Penetrating Radar (GPR) technology. GPR uses the electromagnetic method related the high-frequency pulse that used widely in various field. The experimental study focused on the investigation of the landslide in the road by GPR method with antenna 200 MHz. The landslides become serious problems and required various technique and methods to investigate it in several places. GPR measurements present a useful technique for studies and investigation of the problem. The GPR can be categorized in the first place as an experimental method surveys landslide depths were recognized at 1-10 m below the natural terrain level. The results obtained revealed the causes of landslides on the road.

Schlüsselwörter

  • cavity
  • detection
  • GPR
  • landslide
  • methods
  • risk
Uneingeschränkter Zugang

Integrated Management - a Basic Component for Building a Quality System in Construction

Online veröffentlicht: 21 Jan 2020
Seitenbereich: 59 - 63

Zusammenfassung

Abstract

From ancient times, mankind needed organization and coordination to be able to carry out its projects. Thus, over time, as requirements grew larger, it naturally emerged the necessity, development and improvement, of the skills of manager, coordinator, of a project team.

The paper develops the integrated management concept and tries to apply it for quality system management in construction.

This paper uses the method of the synthesis of the studied documents to demonstrate the necessity to implement integrated management.

Schlüsselwörter

  • construction sector
  • integrated management
  • quality in construction
  • standard quality
Uneingeschränkter Zugang

The Quest for the Ideal Darcy-Weisbach Friction Factor Equation from the Perspective of a Building Services Engineer

Online veröffentlicht: 21 Jan 2020
Seitenbereich: 65 - 73

Zusammenfassung

Abstract

The calculation of the friction factor involved in the Darcy-Weisbach equation has a key role in the accurate assessment of distributed head losses. For the turbulent flow regime, this friction factor was mathematically expressed in the form of the Colebrook-White (C-W) equation, widely accepted by engineers and scientists. Nevertheless, the C-W equation is an implicit one and must be solved using numerical methods. This is a major disadvantage for the average engineer, who always prefers an explicit equation which could be easily integrated into his familiar spreadsheet environment. The present paper is investigating some of the most used explicit alternatives to the C-W equation, with respect to several case scenarios taken from typical Building Services hydraulic calculations.

Schlüsselwörter

  • Colebrook-White
  • explicit equations
  • friction factor
  • relative errors
Uneingeschränkter Zugang

Creating a Sustainable Business Model in the Construction Firm

Online veröffentlicht: 21 Jan 2020
Seitenbereich: 75 - 86

Zusammenfassung

Abstract

Every firm today is facing significant problems which are a consequence of the influence of external and internal factors. This necessitates strategic changes in its activities, which focus on the development of the basic elements of intangible assets - people, knowledge and system, whose effective combination allows building competitive advantage and company growth. The main, specific intangible resource of the company is the business model itself, which is the economic basis of the strategic behavior of the company. From this point of view the purpose of the study is: 1) developing a sustainable business model for the construction firm, 2) analyzing the mechanism by which the manager creates and/or develops his own sustainable business model, taking into account the specifics of the construction market.

Schlüsselwörter

  • business model
  • construction firm
  • sustainable development
  • sustainable construction
  • sustainable business mode
Uneingeschränkter Zugang

Dynamics of the External Environment (Market) and Strategic Behavior of the Construction Firm

Online veröffentlicht: 21 Jan 2020
Seitenbereich: 87 - 97

Zusammenfassung

Abstract

The dynamic changes in the external (and often inside) environment place every firm in front of serious new and unknown challenges and make it more difficult to adapt to them. Under these conditions known traditional short-term models of corporate behavior have an increasingly limited role and a chance for success. The main problem and goal of the company should be a clearly defined long-term strategy that allows building competitive advantages and performance. Therefore, the purpose of the study is to analyze the impact of a dynamic external environment (market) on strategic behavior by developing a conceptual model: “Dynamics of the external environment (market) - Strategic behavior - Competitive advantages” to be applied and tested in the activity of the construction firm.

Schlüsselwörter

  • competitive advantages
  • construction firm
  • dynamics of the external environment (market)
  • strategic behavior
Uneingeschränkter Zugang

Effect of Number and Position of Rotational Friction Dampers on Seismic Response of Steel Frame

Online veröffentlicht: 21 Jan 2020
Seitenbereich: 99 - 104

Zusammenfassung

Abstract

This paper deals with effect of number and position of friction dampers on seismic response of 2D steel frame. For the present study four structures with six storeys are subjected to a time history analysis. For each story are using two, four and six friction dampers with different positions keeping slip load and stiffness constant. To study the effect of number and position of dampers in structures, are analysed the time period, top roof displacement, maximum base shear and percentage energy dissipated in accordance with energy induced in the frame. The results indicate that number and placement of damper affects the structural response. A large number of dampers do not always lead to best benefit in terms of energy dissipation.

Schlüsselwörter

  • dissipation energy
  • friction damper non-linear time
  • history analysis
Uneingeschränkter Zugang

Tension and Compression Testing Machine for Friction Dampers

Online veröffentlicht: 21 Jan 2020
Seitenbereich: 105 - 108

Zusammenfassung

Abstract

The present paper shows the advantages in using this prototype of tension and compression test machine proposed by the authors. The mechanical behaviour of different materials and components can be easily obtained by using this type of device. The equipment enables a simplified change between the types of testing performed. The operators can quickly and easily change elements and accessories used in testing. This equipment is the suitable choice for evaluating different types of friction dampers.

Schlüsselwörter

  • compression
  • force-displacements diagram
  • tension
  • testing machine
Uneingeschränkter Zugang

Projects to Reduce the Coastal Erosion of the Romanian Black Sea Area

Online veröffentlicht: 21 Jan 2020
Seitenbereich: 109 - 114

Zusammenfassung

Abstract

The entire Romanian Black Sea coastline is subject to erosion under the conditions of coastal dynamics changing. The problem the Romanian coastal area is facing is the accelerated number of conflicts between coastal development and coastal erosion. The purpose of this article is to present the projects realized and proposed for the protection and rehabilitation of the Romanian coastal area. The implementation of projects from non-reimbursable European funds to reduce erosion in the coastal area of the Romanian Black Sea coast aims to protect and improve the quality of the environment and the standard of living.

Schlüsselwörter

  • Black Sea
  • coastal zone
  • projects
  • erosion
Uneingeschränkter Zugang

Aspects Regarding the Commercial Profitability of the Companies from Localities on the Coastal Area of Tulcea County

Online veröffentlicht: 21 Jan 2020
Seitenbereich: 115 - 120

Zusammenfassung

Abstract

The purpose of this paper is the analysis of the business environment in the coastal area of Tulcea county, by administrative-territorial units, with the help of a synthetic indicator to appreciate the economic-financial performance, the profit rate. The analysis was performed for year 2018, the economic phenomena and processes being captured at the spatial level. The results obtained from this work support the strategy for the rehabilitation of the coastal zone in order to increase the economic performances by adopting policies corresponding to the new realities.

Schlüsselwörter

  • business environment
  • coastal area
  • economic performance
Uneingeschränkter Zugang

Contributions to the Analysis of Building’s Durability Made of Local Materials

Online veröffentlicht: 21 Jan 2020
Seitenbereich: 121 - 126

Zusammenfassung

Abstract

This paper presents a synthesis of research carried out by authors on local materials used in construction over time in South Eastern Romania. The earth in various forms and technologies has been a perfectible building material that by technologies and specific procedures confers resistance and structural stability. For the research the authors have selected a few specific types of buildings detailing on structural compliance, their sustainability and the factors that led to the depreciation of the building.

Schlüsselwörter

  • durability
  • earthen buildings
  • local materials
15 Artikel
Uneingeschränkter Zugang

Coastal Processes and Longshore Sediment Transport along Zemmouri Bay, Central East Coast of Algeria

Online veröffentlicht: 21 Jan 2020
Seitenbereich: 7 - 15

Zusammenfassung

Abstract

The coastline of Zemmouri Bay on the northeast coast of Algeria with about 50 km of shoreline has been eroding since 1970. Changes of the sandy shoreline are continuous and occur at diverse spatial and temporal scales. This erosion is a major crisis and it potentially impacts the coastal population and natural environment. In order to understand and predict these morphological changes, an accurate description of sediment transport by waves and currents and shoreline change is important. This paper presents a comprehensive study of wave refraction, current-driven sediment transport and shoreline change. Results show that the study area exhibits a great variety of shoreline evolution trends, with erosion prevailing in the eastern and central sectors and stability or even accretion in the Western area.

Schlüsselwörter

  • Zemmouri Bay
  • sediment transport
  • shoreline
  • hydrodynamic
  • coastal process
Uneingeschränkter Zugang

Study on the Non-Compliant Landfill from Bârlad in Vaslui County

Online veröffentlicht: 21 Jan 2020
Seitenbereich: 17 - 24

Zusammenfassung

Abstract

This paper presents a part of a comprehensive study on non-compliant landfill in Vaslui County. We have been tracking the subsidences taking place in the body of waste dumps and the amount of gas removed to take the best post-closure monitoring measures. In order to trace the behavior regarding the subsidence in the landfill body, there were placed in the ground 11 milestones/topographic landmarks of plastics, painted in white and red to be easily identified visually. Keeping them on the same positions made possible the analysis in the present study. Topographic surveys in the ground were performed once a month between April 2014 and September 2015. The results, interpretations and proposed solutions are presented in this paper.

Schlüsselwörter

  • landfill
  • modeling
  • settling
Uneingeschränkter Zugang

The Specifics of Use of Composite Materials in Consolidation of Historical Monuments

Online veröffentlicht: 21 Jan 2020
Seitenbereich: 25 - 33

Zusammenfassung

Abstract

The use of composite systems in protecting, preserving and maintaining historical monuments has become more and more used. There are several consolidation procedures with fiber-reinforced polymeric polymers that can be applied as required or on the basis of the basic material (concrete, masonry, wood, etc.). Besides the many advantages it provides, the application of composite systems in the rehabilitation of heritage buildings and historical monuments requires minimal workmanship. More and more cities are actively involved in the rehabilitation and preservation of heritage buildings and historical monuments by launching good practice guides to preserve local cultural heritage by applying composite elements as robust as possible without the need to modify the overall dimensions of the buildings through a classic covering.

Schlüsselwörter

  • composite materials
  • consolidation
  • historical monuments
Uneingeschränkter Zugang

Proper Infrastructure Design at High Vertical Loads, Nearby Waterfront Structures

Online veröffentlicht: 21 Jan 2020
Seitenbereich: 35 - 43

Zusammenfassung

Abstract

Hence economic growth requires more and more investments in the harbor area, especially nearby waterfront structures, a special attention must be taken into account regarding proper infrastructure design for structures with high vertical loads. At the same time, we have to consider the good behavior of the new design structures and also their impact on the existing nearby waterfront infrastructure. Being adjacent to waterfront structures and due to the limited available space, these structures are typically tall and narrow, and exert average soil pressures on the order of 300KPa. These loads can only be accommodated by ground with an adequate bearing capacity. This publication presents case studies of waterfront projects like grain silos storage facility. Available results for the certification and monitoring of the works are also presented, as well as other considerations based on the author’s experience.

Schlüsselwörter

  • proper infrastructure design
  • structures with high vertical loads
  • waterfront projects
Uneingeschränkter Zugang

Business Management Strategies for Business Development. Organization of the Territory and Planning of Construction Works

Online veröffentlicht: 21 Jan 2020
Seitenbereich: 45 - 50

Zusammenfassung

Abstract

In order for a project to be built with respect to quality, budget compliance and execution time - all required conditions, a professional management of site-level operations is required. The technical complexity, the importance of performing the work on the set deadline, the resource constraints and the substantial costs require the planning, programming and rigorous control of all the works.

Schlüsselwörter

  • business sustainability
  • optimization
  • planning
  • spatial planning
Uneingeschränkter Zugang

GPR Application for Risks Detection in Subsurface Engineering Construction Projects

Online veröffentlicht: 21 Jan 2020
Seitenbereich: 51 - 58

Zusammenfassung

Abstract

The aim of this work is to study and explore the causes of the landslide in different locations using Ground Penetrating Radar (GPR) technology. GPR uses the electromagnetic method related the high-frequency pulse that used widely in various field. The experimental study focused on the investigation of the landslide in the road by GPR method with antenna 200 MHz. The landslides become serious problems and required various technique and methods to investigate it in several places. GPR measurements present a useful technique for studies and investigation of the problem. The GPR can be categorized in the first place as an experimental method surveys landslide depths were recognized at 1-10 m below the natural terrain level. The results obtained revealed the causes of landslides on the road.

Schlüsselwörter

  • cavity
  • detection
  • GPR
  • landslide
  • methods
  • risk
Uneingeschränkter Zugang

Integrated Management - a Basic Component for Building a Quality System in Construction

Online veröffentlicht: 21 Jan 2020
Seitenbereich: 59 - 63

Zusammenfassung

Abstract

From ancient times, mankind needed organization and coordination to be able to carry out its projects. Thus, over time, as requirements grew larger, it naturally emerged the necessity, development and improvement, of the skills of manager, coordinator, of a project team.

The paper develops the integrated management concept and tries to apply it for quality system management in construction.

This paper uses the method of the synthesis of the studied documents to demonstrate the necessity to implement integrated management.

Schlüsselwörter

  • construction sector
  • integrated management
  • quality in construction
  • standard quality
Uneingeschränkter Zugang

The Quest for the Ideal Darcy-Weisbach Friction Factor Equation from the Perspective of a Building Services Engineer

Online veröffentlicht: 21 Jan 2020
Seitenbereich: 65 - 73

Zusammenfassung

Abstract

The calculation of the friction factor involved in the Darcy-Weisbach equation has a key role in the accurate assessment of distributed head losses. For the turbulent flow regime, this friction factor was mathematically expressed in the form of the Colebrook-White (C-W) equation, widely accepted by engineers and scientists. Nevertheless, the C-W equation is an implicit one and must be solved using numerical methods. This is a major disadvantage for the average engineer, who always prefers an explicit equation which could be easily integrated into his familiar spreadsheet environment. The present paper is investigating some of the most used explicit alternatives to the C-W equation, with respect to several case scenarios taken from typical Building Services hydraulic calculations.

Schlüsselwörter

  • Colebrook-White
  • explicit equations
  • friction factor
  • relative errors
Uneingeschränkter Zugang

Creating a Sustainable Business Model in the Construction Firm

Online veröffentlicht: 21 Jan 2020
Seitenbereich: 75 - 86

Zusammenfassung

Abstract

Every firm today is facing significant problems which are a consequence of the influence of external and internal factors. This necessitates strategic changes in its activities, which focus on the development of the basic elements of intangible assets - people, knowledge and system, whose effective combination allows building competitive advantage and company growth. The main, specific intangible resource of the company is the business model itself, which is the economic basis of the strategic behavior of the company. From this point of view the purpose of the study is: 1) developing a sustainable business model for the construction firm, 2) analyzing the mechanism by which the manager creates and/or develops his own sustainable business model, taking into account the specifics of the construction market.

Schlüsselwörter

  • business model
  • construction firm
  • sustainable development
  • sustainable construction
  • sustainable business mode
Uneingeschränkter Zugang

Dynamics of the External Environment (Market) and Strategic Behavior of the Construction Firm

Online veröffentlicht: 21 Jan 2020
Seitenbereich: 87 - 97

Zusammenfassung

Abstract

The dynamic changes in the external (and often inside) environment place every firm in front of serious new and unknown challenges and make it more difficult to adapt to them. Under these conditions known traditional short-term models of corporate behavior have an increasingly limited role and a chance for success. The main problem and goal of the company should be a clearly defined long-term strategy that allows building competitive advantages and performance. Therefore, the purpose of the study is to analyze the impact of a dynamic external environment (market) on strategic behavior by developing a conceptual model: “Dynamics of the external environment (market) - Strategic behavior - Competitive advantages” to be applied and tested in the activity of the construction firm.

Schlüsselwörter

  • competitive advantages
  • construction firm
  • dynamics of the external environment (market)
  • strategic behavior
Uneingeschränkter Zugang

Effect of Number and Position of Rotational Friction Dampers on Seismic Response of Steel Frame

Online veröffentlicht: 21 Jan 2020
Seitenbereich: 99 - 104

Zusammenfassung

Abstract

This paper deals with effect of number and position of friction dampers on seismic response of 2D steel frame. For the present study four structures with six storeys are subjected to a time history analysis. For each story are using two, four and six friction dampers with different positions keeping slip load and stiffness constant. To study the effect of number and position of dampers in structures, are analysed the time period, top roof displacement, maximum base shear and percentage energy dissipated in accordance with energy induced in the frame. The results indicate that number and placement of damper affects the structural response. A large number of dampers do not always lead to best benefit in terms of energy dissipation.

Schlüsselwörter

  • dissipation energy
  • friction damper non-linear time
  • history analysis
Uneingeschränkter Zugang

Tension and Compression Testing Machine for Friction Dampers

Online veröffentlicht: 21 Jan 2020
Seitenbereich: 105 - 108

Zusammenfassung

Abstract

The present paper shows the advantages in using this prototype of tension and compression test machine proposed by the authors. The mechanical behaviour of different materials and components can be easily obtained by using this type of device. The equipment enables a simplified change between the types of testing performed. The operators can quickly and easily change elements and accessories used in testing. This equipment is the suitable choice for evaluating different types of friction dampers.

Schlüsselwörter

  • compression
  • force-displacements diagram
  • tension
  • testing machine
Uneingeschränkter Zugang

Projects to Reduce the Coastal Erosion of the Romanian Black Sea Area

Online veröffentlicht: 21 Jan 2020
Seitenbereich: 109 - 114

Zusammenfassung

Abstract

The entire Romanian Black Sea coastline is subject to erosion under the conditions of coastal dynamics changing. The problem the Romanian coastal area is facing is the accelerated number of conflicts between coastal development and coastal erosion. The purpose of this article is to present the projects realized and proposed for the protection and rehabilitation of the Romanian coastal area. The implementation of projects from non-reimbursable European funds to reduce erosion in the coastal area of the Romanian Black Sea coast aims to protect and improve the quality of the environment and the standard of living.

Schlüsselwörter

  • Black Sea
  • coastal zone
  • projects
  • erosion
Uneingeschränkter Zugang

Aspects Regarding the Commercial Profitability of the Companies from Localities on the Coastal Area of Tulcea County

Online veröffentlicht: 21 Jan 2020
Seitenbereich: 115 - 120

Zusammenfassung

Abstract

The purpose of this paper is the analysis of the business environment in the coastal area of Tulcea county, by administrative-territorial units, with the help of a synthetic indicator to appreciate the economic-financial performance, the profit rate. The analysis was performed for year 2018, the economic phenomena and processes being captured at the spatial level. The results obtained from this work support the strategy for the rehabilitation of the coastal zone in order to increase the economic performances by adopting policies corresponding to the new realities.

Schlüsselwörter

  • business environment
  • coastal area
  • economic performance
Uneingeschränkter Zugang

Contributions to the Analysis of Building’s Durability Made of Local Materials

Online veröffentlicht: 21 Jan 2020
Seitenbereich: 121 - 126

Zusammenfassung

Abstract

This paper presents a synthesis of research carried out by authors on local materials used in construction over time in South Eastern Romania. The earth in various forms and technologies has been a perfectible building material that by technologies and specific procedures confers resistance and structural stability. For the research the authors have selected a few specific types of buildings detailing on structural compliance, their sustainability and the factors that led to the depreciation of the building.

Schlüsselwörter

  • durability
  • earthen buildings
  • local materials

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