{"title":"Analysis of the effects of a wastewater treatment plant failure on the Drava river water quality","authors":"M. Jerković, M. Sokáč, L. Tadić","doi":"10.13167/2016.12.7","DOIUrl":"https://doi.org/10.13167/2016.12.7","url":null,"abstract":"1D model of the Drava River, between 00 + 543 rkm and 69 +118 rkm, was created by the MIKE 11 river-modeling tool. The aim of this model was to analyz","PeriodicalId":53887,"journal":{"name":"Electronic Journal of the Faculty of Civil Engineering Osijek-e-GFOS","volume":"7 1","pages":"57-65"},"PeriodicalIF":0.2,"publicationDate":"2016-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66266556","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The research presented in this paper was motivated by two problems regarding the properties of fresh self-compacting concrete (SCC). The first problem is that mixture properties can vary owing to different factors (composition, materials, ambient, etc.) and the second problem is that there is usually a restricted group of experimental results. Because of the importance of the properties of fresh SCC mixtures, different tests for determining its passing and filling ability, as well as segregation resistance, have been developed. In this paper, results from V-funnel and slump flow tests conducted on seven different concrete mixtures are presented. As a correlation between the measurements of V-funnel period tv and the slump flow period t500 is usually strong, in this paper, it was expanded using approximate-distance fuzzy least squares method. The goal was to perceive the possible range of these properties and, when applicable, to reduce the number of tests necessary during the production of SCC.
{"title":"FORMING A CORRELATION AMONG THE PROPERTIES OF FRESH SELF-COMPACTING CONCRETE USING FUZZY LEAST SQUARES MODEL","authors":"A. Savić, M. Aškrabić","doi":"10.13167/2016.12.8","DOIUrl":"https://doi.org/10.13167/2016.12.8","url":null,"abstract":"The research presented in this paper was motivated by two problems regarding the properties of fresh self-compacting concrete (SCC). The first problem is that mixture properties can vary owing to different factors (composition, materials, ambient, etc.) and the second problem is that there is usually a restricted group of experimental results. Because of the importance of the properties of fresh SCC mixtures, different tests for determining its passing and filling ability, as well as segregation resistance, have been developed. In this paper, results from V-funnel and slump flow tests conducted on seven different concrete mixtures are presented. As a correlation between the measurements of V-funnel period tv and the slump flow period t500 is usually strong, in this paper, it was expanded using approximate-distance fuzzy least squares method. The goal was to perceive the possible range of these properties and, when applicable, to reduce the number of tests necessary during the production of SCC.","PeriodicalId":53887,"journal":{"name":"Electronic Journal of the Faculty of Civil Engineering Osijek-e-GFOS","volume":"7 1","pages":"66-75"},"PeriodicalIF":0.2,"publicationDate":"2016-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66266566","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Old cores of European cities make more than 35% of the entire building stock in Europe, which and often form the social, financial, and touristic centers of cities. These old buildings require constant investments in terms of renewal and preservation to retain their usefulness. Existing risk management tools do not provide sufficient support when managing these types of projects. Hence, previously developed risk breakdown structures (RBSs) for projects on existing buildings were extended to enable simpler project management and clear visibility of critical risks. Previous studies focused on RBSs for construction projects in general. Research with respect on real life projects showed that some risk sources posed a greater threat and had more risk triggers than other risk sources. This study identified critical risk sources with respect to existing RBS and conducted a further analysis of these risk sources. The results of the study examined the fully developed RBS for existing building construction projects with further structuring of specific risk sources. Furthermore, the study identified stakeholders and assigned their risk resolution responsibilities.
{"title":"Risk management tool for improving project flows for construction projects on existing buildings","authors":"Z. Sigmund, M. Radujković","doi":"10.13167/2016.12.9","DOIUrl":"https://doi.org/10.13167/2016.12.9","url":null,"abstract":"Old cores of European cities make more than 35% of the entire building stock in Europe, which and often form the social, financial, and touristic centers of cities. These old buildings require constant investments in terms of renewal and preservation to retain their usefulness. Existing risk management tools do not provide sufficient support when managing these types of projects. Hence, previously developed risk breakdown structures (RBSs) for projects on existing buildings were extended to enable simpler project management and clear visibility of critical risks. Previous studies focused on RBSs for construction projects in general. Research with respect on real life projects showed that some risk sources posed a greater threat and had more risk triggers than other risk sources. This study identified critical risk sources with respect to existing RBS and conducted a further analysis of these risk sources. The results of the study examined the fully developed RBS for existing building construction projects with further structuring of specific risk sources. Furthermore, the study identified stakeholders and assigned their risk resolution responsibilities.","PeriodicalId":53887,"journal":{"name":"Electronic Journal of the Faculty of Civil Engineering Osijek-e-GFOS","volume":"7 1","pages":"76-85"},"PeriodicalIF":0.2,"publicationDate":"2016-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66266574","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The durability of hydraulic engineering structures mostly depends on the resistance of their concrete surfaces to mechanical abrasion. In this paper, we study the hydro-abrasive resistance and mechanical properties of concrete in which cement is partially replaced with fly ash in various proportions. To evaluate these concretes, we measured their compressive strength, flexural strength, static modulus of elasticity, ultrasound velocity through concrete, and sclerometer rebound. The hydro-abrasive resistance of concrete with 15% fly ash was similar to that of reference concrete without fly ash. However, concretes with more than 15% fly ash exhibited lower resistance to abrasive erosion than the reference concrete. Also, the mechanical properties of the concrete deteriorated as the fly ash content increased.
{"title":"HYDRO-ABRASIVE RESISTANCE AND MECHANICAL PROPERTIES OF CONCRETE WITH ADDED FLY ASH","authors":"Nenad Ristić, Zoran Grdić, Gordana Topličić-Ćurčić","doi":"10.13167/2015.11.1","DOIUrl":"https://doi.org/10.13167/2015.11.1","url":null,"abstract":"The durability of hydraulic engineering structures mostly depends on the resistance of their concrete surfaces to mechanical abrasion. In this paper, we study the hydro-abrasive resistance and mechanical properties of concrete in which cement is partially replaced with fly ash in various proportions. To evaluate these concretes, we measured their compressive strength, flexural strength, static modulus of elasticity, ultrasound velocity through concrete, and sclerometer rebound. The hydro-abrasive resistance of concrete with 15% fly ash was similar to that of reference concrete without fly ash. However, concretes with more than 15% fly ash exhibited lower resistance to abrasive erosion than the reference concrete. Also, the mechanical properties of the concrete deteriorated as the fly ash content increased.","PeriodicalId":53887,"journal":{"name":"Electronic Journal of the Faculty of Civil Engineering Osijek-e-GFOS","volume":"6 1","pages":"1-8"},"PeriodicalIF":0.2,"publicationDate":"2015-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66266319","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
As speed limits and traffic on city roads continue to increase, collisions between road vehicles and bridge columns are becoming more common. Current
随着城市道路上的速度限制和交通不断增加，道路车辆与桥柱之间的碰撞变得越来越普遍。当前的
{"title":"COLLISIONS OF ROAD VEHICLES WITH BRIDGE COLUMNS","authors":"Ervin Kožoman, H. Draganić, D. Varevac","doi":"10.13167/2015.11.4","DOIUrl":"https://doi.org/10.13167/2015.11.4","url":null,"abstract":"As speed limits and traffic on city roads continue to increase, collisions between road vehicles and bridge columns are becoming more common. Current","PeriodicalId":53887,"journal":{"name":"Electronic Journal of the Faculty of Civil Engineering Osijek-e-GFOS","volume":"6 1","pages":"29-39"},"PeriodicalIF":0.2,"publicationDate":"2015-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66266386","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Modern society has a growing need for the electricity. To protect the environment, future energy demand must be met with more environmentally friendly technologies, such as renewable energy sources. Because of its vast availability, solar radiation has been used for decades to generate electricity through photovoltaic systems (PV) for residential, educational, and commercial buildings. However, the growth of distributed generation (and renewable energy sources) across power systems in industrialized countries has created new challenges. Random renewable generation causes an imbalance between electricity production and consumption, so smart grids and microgrids may be solutions. In this article, we investigate improving the energy efficiency in the Faculty of Electrical Engineering building in Osijek by using a microgrid. To do so, we compared the total electricity consumption of the building and the production of a 10 kWp photovoltaic power plant on that building. The improvement in energy efficiency of the building produced a maximum savings of up to 10% of the building’s total electricity consumption.
{"title":"IMPROVING ENERGY EFFICIENCY IN BUILDINGS USING MICROGRIDS","authors":"Mario Primorac, Mario Šipoš, Z. Klaić","doi":"10.13167/2015.11.3","DOIUrl":"https://doi.org/10.13167/2015.11.3","url":null,"abstract":"Modern society has a growing need for the electricity. To protect the environment, future energy demand must be met with more environmentally friendly technologies, such as renewable energy sources. Because of its vast availability, solar radiation has been used for decades to generate electricity through photovoltaic systems (PV) for residential, educational, and commercial buildings. However, the growth of distributed generation (and renewable energy sources) across power systems in industrialized countries has created new challenges. Random renewable generation causes an imbalance between electricity production and consumption, so smart grids and microgrids may be solutions. In this article, we investigate improving the energy efficiency in the Faculty of Electrical Engineering building in Osijek by using a microgrid. To do so, we compared the total electricity consumption of the building and the production of a 10 kWp photovoltaic power plant on that building. The improvement in energy efficiency of the building produced a maximum savings of up to 10% of the building’s total electricity consumption.","PeriodicalId":53887,"journal":{"name":"Electronic Journal of the Faculty of Civil Engineering Osijek-e-GFOS","volume":"6 1","pages":"19-28"},"PeriodicalIF":0.2,"publicationDate":"2015-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66266341","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Stefan Micevski, A. Shoklarovski, B. Susinov, Sead Abazi
In this paper, we numerically analyze a 9.0-m-tall reinforced soil retaining wall in a platform embankment, simulating the behaviour of its various components by using software and material models. The two basic constituents of the structure are the fill material and reinforcement. The designed reinforced soil retaining wall was built using local materials (sand with fine particles) on a base of sandy gravel. The design was analyzed with various software packages such as TensarSoil, Slide, and Plaxis 2D. The results show that the wall meets the requirements for both static and seismic conditions.
{"title":"ANALYSIS OF A REINFORCED SOIL RETAINING WALL IN A PLATFORM EMBANKMENT","authors":"Stefan Micevski, A. Shoklarovski, B. Susinov, Sead Abazi","doi":"10.13167/2015.11.5","DOIUrl":"https://doi.org/10.13167/2015.11.5","url":null,"abstract":"In this paper, we numerically analyze a 9.0-m-tall reinforced soil retaining wall in a platform embankment, simulating the behaviour of its various components by using software and material models. The two basic constituents of the structure are the fill material and reinforcement. The designed reinforced soil retaining wall was built using local materials (sand with fine particles) on a base of sandy gravel. The design was analyzed with various software packages such as TensarSoil, Slide, and Plaxis 2D. The results show that the wall meets the requirements for both static and seismic conditions.","PeriodicalId":53887,"journal":{"name":"Electronic Journal of the Faculty of Civil Engineering Osijek-e-GFOS","volume":"6 1","pages":"40-49"},"PeriodicalIF":0.2,"publicationDate":"2015-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.13167/2015.11.5","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66266395","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Microsimulation traffic models are used to analyze and predict the functionality and safety of traffic networks, especially in critical areas such as
微仿真交通模型用于分析和预测交通网络的功能和安全性，特别是在关键领域，如
{"title":"USING A MICROSIMULATION TRAFFIC MODEL TO COMPARE TWO-LANE AND TURBO-ROUNDABOUTS","authors":"I. Kolak, I. I. Otkovic, I. Barišić","doi":"10.13167/2015.11.8","DOIUrl":"https://doi.org/10.13167/2015.11.8","url":null,"abstract":"Microsimulation traffic models are used to analyze and predict the functionality and safety of traffic networks, especially in critical areas such as","PeriodicalId":53887,"journal":{"name":"Electronic Journal of the Faculty of Civil Engineering Osijek-e-GFOS","volume":"6 1","pages":"71-80"},"PeriodicalIF":0.2,"publicationDate":"2015-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.13167/2015.11.8","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66266472","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Noise pollution is a major environmental problem in urban spaces worldwide. The first step toward noise abatement is determining and evaluating noise levels in order to best prioritize and implement protective measures. The city of Osijek, as is obligated by law and the European Directive, has done this by creating a noise map. In this paper, we present measures for noise abatement, showing some of the measures implemented in Osijek based on their noise map, and review possible methods for abating noise in the most vulnerable areas.
{"title":"EXAMPLES OF TRAFFIC NOISE ABATEMENT IN THE CITY OF OSIJEK","authors":"M. Zagvozda, Hrvoje Dragovan, Vesna Dragčević","doi":"10.13167/2015.11.2","DOIUrl":"https://doi.org/10.13167/2015.11.2","url":null,"abstract":"Noise pollution is a major environmental problem in urban spaces worldwide. The first step toward noise abatement is determining and evaluating noise levels in order to best prioritize and implement protective measures. The city of Osijek, as is obligated by law and the European Directive, has done this by creating a noise map. In this paper, we present measures for noise abatement, showing some of the measures implemented in Osijek based on their noise map, and review possible methods for abating noise in the most vulnerable areas.","PeriodicalId":53887,"journal":{"name":"Electronic Journal of the Faculty of Civil Engineering Osijek-e-GFOS","volume":"6 1","pages":"9-18"},"PeriodicalIF":0.2,"publicationDate":"2015-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66266333","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The Croatian territory, as part of the Mediterranean-trans-Asiatic belt, experiences pronounced earthquake activity. Seismic risk is the expected damage caused by earthquakes to buildings, measured both in social and economic losses, which can be described through seismic hazard, seismic vulnerability, and exposure. The city of Osijek is located in the eastern part of Croatia, and Retfala Nova is a residential settlement in the western part of the city. An important step in assessing earthquake loss is defining the exposure, so we created a form used to collect information on buildings and make a building database. In this paper, we estimated seismic vulnerability based on the capacity spectrum method, which involves constructing fragility curves and converting them to damage probability matrices, as well as constructing capacity curves.
{"title":"ASSESSING SEISMIC RISK IN RETFALA NOVA, OSIJEK","authors":"Maja Galista, M. Hadzima-Nyarko","doi":"10.13167/2015.11.6","DOIUrl":"https://doi.org/10.13167/2015.11.6","url":null,"abstract":"The Croatian territory, as part of the Mediterranean-trans-Asiatic belt, experiences pronounced earthquake activity. Seismic risk is the expected damage caused by earthquakes to buildings, measured both in social and economic losses, which can be described through seismic hazard, seismic vulnerability, and exposure. The city of Osijek is located in the eastern part of Croatia, and Retfala Nova is a residential settlement in the western part of the city. An important step in assessing earthquake loss is defining the exposure, so we created a form used to collect information on buildings and make a building database. In this paper, we estimated seismic vulnerability based on the capacity spectrum method, which involves constructing fragility curves and converting them to damage probability matrices, as well as constructing capacity curves.","PeriodicalId":53887,"journal":{"name":"Electronic Journal of the Faculty of Civil Engineering Osijek-e-GFOS","volume":"6 1","pages":"50-61"},"PeriodicalIF":0.2,"publicationDate":"2015-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66266406","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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