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Volume 16 (2021): Issue 1 (June 2021)

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Volume 8 (2013): Issue 1 (June 2013)

Volume 7 (2012): Issue 2 (November 2012)

Volume 7 (2012): Issue 1 (June 2012)

Journal Details
Format
Journal
eISSN
1338-7278
ISSN
1338-7278
First Published
29 Mar 2013
Publication timeframe
2 times per year
Languages
English

Search

Volume 8 (2013): Issue 1 (June 2013)

Journal Details
Format
Journal
eISSN
1338-7278
ISSN
1338-7278
First Published
29 Mar 2013
Publication timeframe
2 times per year
Languages
English

Search

12 Articles
Open Access

Role of Infiltration and Saturation Excess in Rainfall-Runoff Modelling in Small Catchments

Published Online: 21 May 2013
Page range: 5 - 12

Abstract

Abstract

The paper presents the essential differences in small catchment model behaviour depending on the assumed runoff procedure, i.e. infiltration or saturation excess. It suggests an appropriate model structure and a way to obtain the required boundary conditions. In order to design the flood mitigation measures in small catchments, there is a need of reliable prediction of their behaviour. Long time series of data are rather rare here and the simple models are usually not capable to reflect all the necessary variables and their distribution. However, more comprehensive models are usually very demanding with respect to input data. A model of Bykovicky stream catchment (6.3 km2) was built in the physically based distributed model GSSHA. Out of two years of rainfall-runoff data several events were used for model calibration. Gradually the model was changed in order to explain observed data better. First modelling outcomes suggested a significant influence of saturation excess on flood hydrographs in most of the scenarios. In order to reflect this, the model needs to contain groundwater related processes, but the data on groundwater table position was not available. Therefore a simple method how to obtain it was proposed and tested. The paper discusses the achievements of this modelling experiment.

Keywords

  • flood protection
  • small catchments
  • rainfall-runoff modelling
  • infiltration excess
  • saturation excess
Open Access

Integration of Occupational Safety to Contractors` or Subcontractors` Performance Evaluation in Construction Projects

Published Online: 21 May 2013
Page range: 13 - 24

Abstract

Abstract

Several factors should be considered by the owner and general contractor in the process of contractors` and subcontractors` selection and evaluation. The paper reviews the recent models addressed to guide general contractors in subcontractors’ selection process and in evaluation of different contractors during the execution of the project. Moreover the paper suggests the impact of different contractors’ performance to the overall level of occupational health and safety culture at the sites. It deals with the factors influencing the safety performance of contractors during construction and analyses the methods for assessing the safety performance of construction contractors. The results of contractors’ safety performance evaluation could be a useful tool in motivating contractors to achieve better safety outcomes or could have effect on owners` or general contractors’ decision making about contractors suitability for future contracting works.

Keywords

  • construction
  • contractors
  • subcontractors
  • contractors’ performance
  • contractors’ evaluation
Open Access

Implementation of MCA Method for Identification of Factors for Conceptual Cost Estimation of Residential Buildings

Published Online: 21 May 2013
Page range: 25 - 34

Abstract

Abstract

Conceptual cost estimation is important for construction projects. Either underestimation or overestimation of building raising cost may lead to failure of a project. In the paper authors present application of a multicriteria comparative analysis (MCA) in order to select factors influencing residential building raising cost. The aim of the analysis is to indicate key factors useful in conceptual cost estimation in the early design stage. Key factors are being investigated on basis of the elementary information about the function, form and structure of the building, and primary assumptions of technological and organizational solutions applied in construction process. The mentioned factors are considered as variables of the model which aim is to make possible conceptual cost estimation fast and with satisfying accuracy. The whole analysis included three steps: preliminary research, choice of a set of potential variables and reduction of this set to select the final set of variables. Multicriteria comparative analysis is applied in problem solution. Performed analysis allowed to select group of factors, defined well enough at the conceptual stage of the design process, to be used as a describing variables of the model.

Keywords

  • residential building cost
  • conceptual cost estimation
  • cost factors
  • multicriteria comparative analysis
Open Access

Software for the Design of Swimming Pool Dehumidifiers Units

Published Online: 21 May 2013
Page range: 35 - 42

Abstract

Abstract

The article deals with the description and solution of physical phenomena taking place during evaporation of water. The topicality of the theme is given a number of built indoor swimming pool and wellness centers at present. In addressing HVAC systems serving these areas, it is necessary to know the various design parameters in the interior including the water temperature as the pool temperature and humidity. Following is a description of the calculation module, air handling units, including optimizing the settings of the physical changes in order to ensure the lowest energy consumption for air treatment and required maintaining internal microclimate parameters.

Keywords

  • air-conditioning
  • evaporation from water surface
  • dehumidification of swimming pools
  • software development
Open Access

Temperature Stratification of Underfloor and Ceiling Based Air Heating Distribution System in an Experimental Room

Published Online: 21 May 2013
Page range: 43 - 50

Abstract

Abstract

Most of air heating and ventilating systems for passive houses inlet air in floors. It is assumed that a natural motion of air is led upwards, and so the right stratification of temperature in the space is ensured. However, in the case of excellently insulated buildings it is possible to assume that an upper inlet of air is also able to ensure the required layering of temperature. Within the experiment an influence of upper and down air inlet for temperature stratification in the space was followed. Night sensors of indoor air temperature are placed for measurement purposes. Measurements are done in the long term. The results from measurements show that both, vertical and horizontal stratification of temperature in rooms of passive houses are equal regardless of the fact, which system of air inlet is used.

Keywords

  • air heating
  • distribution
  • temperature
  • stratifikation
  • building
Open Access

Analysis of Coagulation Processes for the Groundwater Treatment

Published Online: 21 May 2013
Page range: 51 - 58

Abstract

Abstract

Coagulation process is widely used for removal of natural organic matters (NOM) and for water color intensity reduction. The efficiency of coagulation process depends on many different factors. Aim of this research is to investigate coagulation process under different conditions. During the research coagulation process was held at different pH values (5.5; 6.0; 6.5), at different water alkalinity and at different water turbidity. It was found that removal of NOM and water color intensity reduction is most effective at pH values from 5.5 to 6.0. At these conditions water color intensity reduction is most efficient, but removal of dissolved organic carbon (DOC) is the lowest. During the research it was also found that different water alkalinity and turbidity do not make significant influence on efficiency of coagulation process.

Keywords

  • drinking water
  • natural organic matter
  • coagulation
  • pH
  • alkalinity
  • turbidity
Open Access

Theoretical and Experimental Stress-Strain Analysis of Compressed Steel Members with Closed Cross-Sections

Published Online: 21 May 2013
Page range: 59 - 66

Abstract

Abstract

The paper presents fundamental information about experimental and theoretic-numerical research to determinate the load-carrying capacity of thin-walled cold-formed compressed steel members. The investigated members have closed cross-sections made from homogeneous materials. The theoretic-numerical analysis in this paper is oriented on the modeling of the initial deviations effects, caused by production process, on the load-carrying capacities of mentioned members, while the experimental investigation is to verify the theoretical results and to investigate the behavior of mentioned members during the loading process.

Keywords

  • Load-carrying capacity
  • initial deviations
  • thin-walled cold-formed profiles
Open Access

Multi-Functioning in Virtual Monitoring of Thin-Walled Bridges

Published Online: 21 May 2013
Page range: 67 - 78

Abstract

Abstract

Multi-functioning in virtual monitoring of thin-walled bridges is treated in present paper. The approach enables multiple functions in virtual monitoring of bridges made of integrated thin-walled members with their hierarchical configuration. Theoretical, numerical and experimental in situ assessment of the problem is presented. Some results of structural application are submitted.

Keywords

  • multi-functioning
  • optimization
  • thin-walled bridge
  • ultimate behavior
  • virtual monitoring
  • wave propagation
Open Access

Evaluation of Facility Management by Multivariate Statistics – Factor Analysis

Published Online: 21 May 2013
Page range: 79 - 86

Abstract

Abstract

Facility management is evolving, there is no exact than other sciences, although its development is fast forward. The knowledge and practical skills in facility management is not replaced, on the contrary, they complement each other. The existing low utilization of science in the field of facility management is mainly caused by the management of support activities are many variables and prevailing immediate reaction to the extraordinary situation arising from motives of those who have substantial experience and years of proven experience. Facility management is looking for a system that uses organized knowledge and will form the basis, which grows from a wide range of disciplines. Significant influence on its formation as a scientific discipline is the "structure, which follows strategy". The paper deals evaluate technology building as part of an facility management by multivariate statistic - factor analysis.

Keywords

  • facility management
  • technology building
  • factor analysis
Open Access

Lean Production as an Innovative Approach to Construction

Published Online: 21 May 2013
Page range: 87 - 96

Abstract

Abstract

Lean production presents a new approach to the construction management which has enabled enterprises to attain very high levels of efficiency, competitiveness and flexibility in production systems. Nowadays, a number of industrial processes are managed in accordance with these advanced management principles [1]. The principles of lean production are applied within the integrated design and delivery solutions (IDDS) and prefabricated construction.

IDDS uses collaborative work processes and enhanced skills, with integrated data, information, and knowledge management to minimize structural and process inefficiencies and to enhance the value delivered during design, build, and operation, and across projects. Prefabrication presents a one of opportunities for construction methods, which allows the compliance with principles of sustainable design, provides the potential benefits such as faster construction, fewer housing defects, reduction in energy use and waste and elimination of environmental and safety risks.

This paper presents the lean production within the IDDS and its potential in the modern prefabrication. There is created a field providing of benefits of lean production in construction industry.

Keywords

  • lean production
  • prefabrication
  • integrated design and delivery solutions (IDDS)
  • construction industry
Open Access

Assessing Flood Mitigation Alternatives in Brezovička Village in Slovakia

Published Online: 21 May 2013
Page range: 97 - 106

Abstract

Abstract

Flooding due to extreme rain events in urban environments is a problem and a growing concern. There is an increasing demand for a new paradigm to improve flood-mitigation decision processes that calls for riskreduction strategies at several levels. Therefore is a challenge in assessing and comparing different flood mitigation measures. The aim of this paper is to explore a new method to improve an environmental impact assessment of flood-mitigation measures in decision processes by risk analysis method.

Keywords

  • flood mitigation measures
  • environmental impact assessment (EIA)
  • alternatives
  • risk analysis (RA)
Open Access

State of the Art in the Utilization of Deck Bridges with Encased Filler-Beams in the Standard Construction Practice

Published Online: 21 May 2013
Page range: 107 - 114

Abstract

Abstract

Deck bridges with encased filler-beams have been used in construction for a long time. Nowadays they are employed mainly in the refurbishment of railways and in road construction. Regarding the method of construction, they can be divided into monolithic/cast-in-place (constructed fully in its final location) or prefabricated/precast structures (built at another location and then transported to their final location for placement in the full structure). Both methods of construction have certain advantages and disadvantages. Decision-making and selecting a better alternative depends on the building conditions and a means of transport (whether a road or railway) running on the bridge.

Keywords

  • deck bridges
  • encased beams
  • construction
12 Articles
Open Access

Role of Infiltration and Saturation Excess in Rainfall-Runoff Modelling in Small Catchments

Published Online: 21 May 2013
Page range: 5 - 12

Abstract

Abstract

The paper presents the essential differences in small catchment model behaviour depending on the assumed runoff procedure, i.e. infiltration or saturation excess. It suggests an appropriate model structure and a way to obtain the required boundary conditions. In order to design the flood mitigation measures in small catchments, there is a need of reliable prediction of their behaviour. Long time series of data are rather rare here and the simple models are usually not capable to reflect all the necessary variables and their distribution. However, more comprehensive models are usually very demanding with respect to input data. A model of Bykovicky stream catchment (6.3 km2) was built in the physically based distributed model GSSHA. Out of two years of rainfall-runoff data several events were used for model calibration. Gradually the model was changed in order to explain observed data better. First modelling outcomes suggested a significant influence of saturation excess on flood hydrographs in most of the scenarios. In order to reflect this, the model needs to contain groundwater related processes, but the data on groundwater table position was not available. Therefore a simple method how to obtain it was proposed and tested. The paper discusses the achievements of this modelling experiment.

Keywords

  • flood protection
  • small catchments
  • rainfall-runoff modelling
  • infiltration excess
  • saturation excess
Open Access

Integration of Occupational Safety to Contractors` or Subcontractors` Performance Evaluation in Construction Projects

Published Online: 21 May 2013
Page range: 13 - 24

Abstract

Abstract

Several factors should be considered by the owner and general contractor in the process of contractors` and subcontractors` selection and evaluation. The paper reviews the recent models addressed to guide general contractors in subcontractors’ selection process and in evaluation of different contractors during the execution of the project. Moreover the paper suggests the impact of different contractors’ performance to the overall level of occupational health and safety culture at the sites. It deals with the factors influencing the safety performance of contractors during construction and analyses the methods for assessing the safety performance of construction contractors. The results of contractors’ safety performance evaluation could be a useful tool in motivating contractors to achieve better safety outcomes or could have effect on owners` or general contractors’ decision making about contractors suitability for future contracting works.

Keywords

  • construction
  • contractors
  • subcontractors
  • contractors’ performance
  • contractors’ evaluation
Open Access

Implementation of MCA Method for Identification of Factors for Conceptual Cost Estimation of Residential Buildings

Published Online: 21 May 2013
Page range: 25 - 34

Abstract

Abstract

Conceptual cost estimation is important for construction projects. Either underestimation or overestimation of building raising cost may lead to failure of a project. In the paper authors present application of a multicriteria comparative analysis (MCA) in order to select factors influencing residential building raising cost. The aim of the analysis is to indicate key factors useful in conceptual cost estimation in the early design stage. Key factors are being investigated on basis of the elementary information about the function, form and structure of the building, and primary assumptions of technological and organizational solutions applied in construction process. The mentioned factors are considered as variables of the model which aim is to make possible conceptual cost estimation fast and with satisfying accuracy. The whole analysis included three steps: preliminary research, choice of a set of potential variables and reduction of this set to select the final set of variables. Multicriteria comparative analysis is applied in problem solution. Performed analysis allowed to select group of factors, defined well enough at the conceptual stage of the design process, to be used as a describing variables of the model.

Keywords

  • residential building cost
  • conceptual cost estimation
  • cost factors
  • multicriteria comparative analysis
Open Access

Software for the Design of Swimming Pool Dehumidifiers Units

Published Online: 21 May 2013
Page range: 35 - 42

Abstract

Abstract

The article deals with the description and solution of physical phenomena taking place during evaporation of water. The topicality of the theme is given a number of built indoor swimming pool and wellness centers at present. In addressing HVAC systems serving these areas, it is necessary to know the various design parameters in the interior including the water temperature as the pool temperature and humidity. Following is a description of the calculation module, air handling units, including optimizing the settings of the physical changes in order to ensure the lowest energy consumption for air treatment and required maintaining internal microclimate parameters.

Keywords

  • air-conditioning
  • evaporation from water surface
  • dehumidification of swimming pools
  • software development
Open Access

Temperature Stratification of Underfloor and Ceiling Based Air Heating Distribution System in an Experimental Room

Published Online: 21 May 2013
Page range: 43 - 50

Abstract

Abstract

Most of air heating and ventilating systems for passive houses inlet air in floors. It is assumed that a natural motion of air is led upwards, and so the right stratification of temperature in the space is ensured. However, in the case of excellently insulated buildings it is possible to assume that an upper inlet of air is also able to ensure the required layering of temperature. Within the experiment an influence of upper and down air inlet for temperature stratification in the space was followed. Night sensors of indoor air temperature are placed for measurement purposes. Measurements are done in the long term. The results from measurements show that both, vertical and horizontal stratification of temperature in rooms of passive houses are equal regardless of the fact, which system of air inlet is used.

Keywords

  • air heating
  • distribution
  • temperature
  • stratifikation
  • building
Open Access

Analysis of Coagulation Processes for the Groundwater Treatment

Published Online: 21 May 2013
Page range: 51 - 58

Abstract

Abstract

Coagulation process is widely used for removal of natural organic matters (NOM) and for water color intensity reduction. The efficiency of coagulation process depends on many different factors. Aim of this research is to investigate coagulation process under different conditions. During the research coagulation process was held at different pH values (5.5; 6.0; 6.5), at different water alkalinity and at different water turbidity. It was found that removal of NOM and water color intensity reduction is most effective at pH values from 5.5 to 6.0. At these conditions water color intensity reduction is most efficient, but removal of dissolved organic carbon (DOC) is the lowest. During the research it was also found that different water alkalinity and turbidity do not make significant influence on efficiency of coagulation process.

Keywords

  • drinking water
  • natural organic matter
  • coagulation
  • pH
  • alkalinity
  • turbidity
Open Access

Theoretical and Experimental Stress-Strain Analysis of Compressed Steel Members with Closed Cross-Sections

Published Online: 21 May 2013
Page range: 59 - 66

Abstract

Abstract

The paper presents fundamental information about experimental and theoretic-numerical research to determinate the load-carrying capacity of thin-walled cold-formed compressed steel members. The investigated members have closed cross-sections made from homogeneous materials. The theoretic-numerical analysis in this paper is oriented on the modeling of the initial deviations effects, caused by production process, on the load-carrying capacities of mentioned members, while the experimental investigation is to verify the theoretical results and to investigate the behavior of mentioned members during the loading process.

Keywords

  • Load-carrying capacity
  • initial deviations
  • thin-walled cold-formed profiles
Open Access

Multi-Functioning in Virtual Monitoring of Thin-Walled Bridges

Published Online: 21 May 2013
Page range: 67 - 78

Abstract

Abstract

Multi-functioning in virtual monitoring of thin-walled bridges is treated in present paper. The approach enables multiple functions in virtual monitoring of bridges made of integrated thin-walled members with their hierarchical configuration. Theoretical, numerical and experimental in situ assessment of the problem is presented. Some results of structural application are submitted.

Keywords

  • multi-functioning
  • optimization
  • thin-walled bridge
  • ultimate behavior
  • virtual monitoring
  • wave propagation
Open Access

Evaluation of Facility Management by Multivariate Statistics – Factor Analysis

Published Online: 21 May 2013
Page range: 79 - 86

Abstract

Abstract

Facility management is evolving, there is no exact than other sciences, although its development is fast forward. The knowledge and practical skills in facility management is not replaced, on the contrary, they complement each other. The existing low utilization of science in the field of facility management is mainly caused by the management of support activities are many variables and prevailing immediate reaction to the extraordinary situation arising from motives of those who have substantial experience and years of proven experience. Facility management is looking for a system that uses organized knowledge and will form the basis, which grows from a wide range of disciplines. Significant influence on its formation as a scientific discipline is the "structure, which follows strategy". The paper deals evaluate technology building as part of an facility management by multivariate statistic - factor analysis.

Keywords

  • facility management
  • technology building
  • factor analysis
Open Access

Lean Production as an Innovative Approach to Construction

Published Online: 21 May 2013
Page range: 87 - 96

Abstract

Abstract

Lean production presents a new approach to the construction management which has enabled enterprises to attain very high levels of efficiency, competitiveness and flexibility in production systems. Nowadays, a number of industrial processes are managed in accordance with these advanced management principles [1]. The principles of lean production are applied within the integrated design and delivery solutions (IDDS) and prefabricated construction.

IDDS uses collaborative work processes and enhanced skills, with integrated data, information, and knowledge management to minimize structural and process inefficiencies and to enhance the value delivered during design, build, and operation, and across projects. Prefabrication presents a one of opportunities for construction methods, which allows the compliance with principles of sustainable design, provides the potential benefits such as faster construction, fewer housing defects, reduction in energy use and waste and elimination of environmental and safety risks.

This paper presents the lean production within the IDDS and its potential in the modern prefabrication. There is created a field providing of benefits of lean production in construction industry.

Keywords

  • lean production
  • prefabrication
  • integrated design and delivery solutions (IDDS)
  • construction industry
Open Access

Assessing Flood Mitigation Alternatives in Brezovička Village in Slovakia

Published Online: 21 May 2013
Page range: 97 - 106

Abstract

Abstract

Flooding due to extreme rain events in urban environments is a problem and a growing concern. There is an increasing demand for a new paradigm to improve flood-mitigation decision processes that calls for riskreduction strategies at several levels. Therefore is a challenge in assessing and comparing different flood mitigation measures. The aim of this paper is to explore a new method to improve an environmental impact assessment of flood-mitigation measures in decision processes by risk analysis method.

Keywords

  • flood mitigation measures
  • environmental impact assessment (EIA)
  • alternatives
  • risk analysis (RA)
Open Access

State of the Art in the Utilization of Deck Bridges with Encased Filler-Beams in the Standard Construction Practice

Published Online: 21 May 2013
Page range: 107 - 114

Abstract

Abstract

Deck bridges with encased filler-beams have been used in construction for a long time. Nowadays they are employed mainly in the refurbishment of railways and in road construction. Regarding the method of construction, they can be divided into monolithic/cast-in-place (constructed fully in its final location) or prefabricated/precast structures (built at another location and then transported to their final location for placement in the full structure). Both methods of construction have certain advantages and disadvantages. Decision-making and selecting a better alternative depends on the building conditions and a means of transport (whether a road or railway) running on the bridge.

Keywords

  • deck bridges
  • encased beams
  • construction

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