Pub Date : 2017-12-21DOI: 10.3846/2029882X.2017.1418172
J. Correia, A. Jesus, R. Calçada
"Editorial. Structural integrity of materials and structures" Engineering Structures and Technologies, 9(4), pp. 157
《材料和结构的结构完整性》，《工程结构与技术》，9（4），第157页
{"title":"Structural integrity of materials and structures","authors":"J. Correia, A. Jesus, R. Calçada","doi":"10.3846/2029882X.2017.1418172","DOIUrl":"https://doi.org/10.3846/2029882X.2017.1418172","url":null,"abstract":"\"Editorial. Structural integrity of materials and structures\" Engineering Structures and Technologies, 9(4), pp. 157","PeriodicalId":11839,"journal":{"name":"Engineering Structures and Technologies","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49030506","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}
Pub Date : 2017-12-21DOI: 10.3846/2029882X.2017.1416311
E. Mesquita, Francisco Da Silva Brandão, Aldecira G. Diogenes, P. Antunes, H. Varum
The present paper shows the vibrational characterization tests of a clay brick heritage construction from XIX century, the Nossa Senhora das Dores Church, placed in Sobral, Brazil. In this study the calibration of the 3D finite element numerical model of the church was performed through ambient vibrational testing using the first three natural frequencies identified. The obtained results, namely the natural frequencies identified, and the calibrated model intends to give a contribute for understanding of the structural behavior of the Brazilian heritage constructions, and introduces relevant information for be used for safety assessment of the church along the time.
本文展示了19世纪巴西索布拉尔的Nossa Senhora das Dores教堂的粘土砖遗产建筑的振动特性测试。在这项研究中，通过使用确定的前三个固有频率进行环境振动测试，对教堂的三维有限元数值模型进行了校准。所获得的结果，即确定的固有频率，以及校准的模型旨在为理解巴西遗产建筑的结构行为做出贡献，并为教堂的安全评估提供相关信息。
{"title":"Ambient vibrational characterization of the Nossa Senhora das Dores Church","authors":"E. Mesquita, Francisco Da Silva Brandão, Aldecira G. Diogenes, P. Antunes, H. Varum","doi":"10.3846/2029882X.2017.1416311","DOIUrl":"https://doi.org/10.3846/2029882X.2017.1416311","url":null,"abstract":"The present paper shows the vibrational characterization tests of a clay brick heritage construction from XIX century, the Nossa Senhora das Dores Church, placed in Sobral, Brazil. In this study the calibration of the 3D finite element numerical model of the church was performed through ambient vibrational testing using the first three natural frequencies identified. The obtained results, namely the natural frequencies identified, and the calibrated model intends to give a contribute for understanding of the structural behavior of the Brazilian heritage constructions, and introduces relevant information for be used for safety assessment of the church along the time.","PeriodicalId":11839,"journal":{"name":"Engineering Structures and Technologies","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.3846/2029882X.2017.1416311","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43938340","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}
Pub Date : 2017-10-01DOI: 10.3846/2029882X.2017.1347528
B. Juodagalviene, Zenonas Turskis, Jonas Šaparauskas, A. Endriukaitytė
With this article we strive to create a theoretical valuation model based on multiple criteria mathematical methods by selecting a basic shape of single-family residential house‘s plan. Most of the researches and analysis discuss the interfaces of architectural shapes of the buildings with sustainability only in the buildings with unique design. Meanwhile, the model comprising a selection of a basic shape of the singlefamily house was not implemented. Our study evaluated the individual parameters associated with selection of the house shape: compactness, safety, material input, variability of premises and spaces. The SWARA (Step-Wise Weight Assessment Ratio Analysis) method is applied in the calculation of the relative importance of the criteria and the EDAS (The Method of Evaluation Based on Distance from Average Solution) method was used to prioritize the alternatives.
{"title":"Integrated multi-criteria evaluation of house’s plan shape based on the EDAS and SWARA methods","authors":"B. Juodagalviene, Zenonas Turskis, Jonas Šaparauskas, A. Endriukaitytė","doi":"10.3846/2029882X.2017.1347528","DOIUrl":"https://doi.org/10.3846/2029882X.2017.1347528","url":null,"abstract":"With this article we strive to create a theoretical valuation model based on multiple criteria mathematical methods by selecting a basic shape of single-family residential house‘s plan. Most of the researches and analysis discuss the interfaces of architectural shapes of the buildings with sustainability only in the buildings with unique design. Meanwhile, the model comprising a selection of a basic shape of the singlefamily house was not implemented. Our study evaluated the individual parameters associated with selection of the house shape: compactness, safety, material input, variability of premises and spaces. The SWARA (Step-Wise Weight Assessment Ratio Analysis) method is applied in the calculation of the relative importance of the criteria and the EDAS (The Method of Evaluation Based on Distance from Average Solution) method was used to prioritize the alternatives.","PeriodicalId":11839,"journal":{"name":"Engineering Structures and Technologies","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.3846/2029882X.2017.1347528","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44876364","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}
Pub Date : 2017-10-01DOI: 10.3846/2029882X.2017.1371085
B. Akinyemi, T. Omoniyi
In this study, bamboo fibres from Bambusa Vulgaris species were used as reinforcement materials for acrylic emulsion polymer modified concrete to determine their engineering properties and elemental compositions. Moisture absorption, density and percentage voids were investigated as well as the compressive strength, flexural strength and split tensile strength at 28, 45 and 60 days of air curing. Acrylic polymers reduced moisture intake, increased the densities and led to another increase in percentage of voids but composite samples with bamboo fibre inclusions at 1.5% and 10% polymers with 1.5% fibre an 15% polymers showed better physical properties than those with polymers only. Compressive and split tensile strength tests had similar results of optimum strength at 45 days while flexural strength test had optimum value at 60 days of air curing. This showed that the properties of unreinforced concrete could be improved through addition of fibres and polymers for use in structural applications.
{"title":"Engineering properties of acrylic emulsion polymer modified bamboo reinforced cement bonded composites","authors":"B. Akinyemi, T. Omoniyi","doi":"10.3846/2029882X.2017.1371085","DOIUrl":"https://doi.org/10.3846/2029882X.2017.1371085","url":null,"abstract":"In this study, bamboo fibres from Bambusa Vulgaris species were used as reinforcement materials for acrylic emulsion polymer modified concrete to determine their engineering properties and elemental compositions. Moisture absorption, density and percentage voids were investigated as well as the compressive strength, flexural strength and split tensile strength at 28, 45 and 60 days of air curing. Acrylic polymers reduced moisture intake, increased the densities and led to another increase in percentage of voids but composite samples with bamboo fibre inclusions at 1.5% and 10% polymers with 1.5% fibre an 15% polymers showed better physical properties than those with polymers only. Compressive and split tensile strength tests had similar results of optimum strength at 45 days while flexural strength test had optimum value at 60 days of air curing. This showed that the properties of unreinforced concrete could be improved through addition of fibres and polymers for use in structural applications.","PeriodicalId":11839,"journal":{"name":"Engineering Structures and Technologies","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.3846/2029882X.2017.1371085","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41610607","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}
Pub Date : 2017-10-01DOI: 10.3846/2029882X.2017.1382127
Z. Saidova, V. Grakhov, G. Yakovlev, A. Gordina, A. Zakharov
AbstractThe article contains a short overview of current research base state in the field of thermal analysis of glass-fiber reinforced polymer (GFRP). The relationship between temperature raise and specimens weight loss is presented. It is noted that results of experiments run by different scientists vary widely and cannot form a common GFRP behavior model under heating. To compare the effect of thermal exposure on GFRP of a number of Russian manufacturers, the thermal analysis of composite rebar was carried out. Weight fluctuation was recorded with temperature ranging from 22 to 500 °C. The results of visual estimation of the effect of heating GFRP specimen up to 200 °C is also presented. All experiments were conducted according to requirements of corresponding regulations.
{"title":"Thermal analysis of glass-fiber reinforced polymer rebars","authors":"Z. Saidova, V. Grakhov, G. Yakovlev, A. Gordina, A. Zakharov","doi":"10.3846/2029882X.2017.1382127","DOIUrl":"https://doi.org/10.3846/2029882X.2017.1382127","url":null,"abstract":"AbstractThe article contains a short overview of current research base state in the field of thermal analysis of glass-fiber reinforced polymer (GFRP). The relationship between temperature raise and specimens weight loss is presented. It is noted that results of experiments run by different scientists vary widely and cannot form a common GFRP behavior model under heating. To compare the effect of thermal exposure on GFRP of a number of Russian manufacturers, the thermal analysis of composite rebar was carried out. Weight fluctuation was recorded with temperature ranging from 22 to 500 °C. The results of visual estimation of the effect of heating GFRP specimen up to 200 °C is also presented. All experiments were conducted according to requirements of corresponding regulations.","PeriodicalId":11839,"journal":{"name":"Engineering Structures and Technologies","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.3846/2029882X.2017.1382127","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49037780","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}
Pub Date : 2017-10-01DOI: 10.3846/2029882X.2017.1380539
Fardad Haghpanah, H. Foroughi, Reza Behrou
In the past twenty years, sustainable development has become a challenging subject across many scientific fields. With the built environment as the major component of societies, sustainable constru...
{"title":"Sustainable seismic retrofitting of a RC building using performance based design approach","authors":"Fardad Haghpanah, H. Foroughi, Reza Behrou","doi":"10.3846/2029882X.2017.1380539","DOIUrl":"https://doi.org/10.3846/2029882X.2017.1380539","url":null,"abstract":"In the past twenty years, sustainable development has become a challenging subject across many scientific fields. With the built environment as the major component of societies, sustainable constru...","PeriodicalId":11839,"journal":{"name":"Engineering Structures and Technologies","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.3846/2029882X.2017.1380539","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41423175","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}
Pub Date : 2017-07-03DOI: 10.3846/2029882X.2017.1381044
M. Daugevičius
Different strengthening technique was evaluated in order to investigate the effect of prestress. The analysed beams were strengthened with non-prestressed CFRP and prestressed CFRP at different loading levels. It has allowed a better understanding about strengthening effectiveness. Results obtained by finite element analysis were compared with experimental results obtained by other researchers. Phased nonlinear analysis was used to simulate the behaviour of the strengthened beams. Performed analysis showed that it is possible to use finite element analysis in order to investigate a real behaviour of the strengthened elements in real structure.
{"title":"Numerical investigation of RC beams strengthened with prestressed CFRP","authors":"M. Daugevičius","doi":"10.3846/2029882X.2017.1381044","DOIUrl":"https://doi.org/10.3846/2029882X.2017.1381044","url":null,"abstract":"Different strengthening technique was evaluated in order to investigate the effect of prestress. The analysed beams were strengthened with non-prestressed CFRP and prestressed CFRP at different loading levels. It has allowed a better understanding about strengthening effectiveness. Results obtained by finite element analysis were compared with experimental results obtained by other researchers. Phased nonlinear analysis was used to simulate the behaviour of the strengthened beams. Performed analysis showed that it is possible to use finite element analysis in order to investigate a real behaviour of the strengthened elements in real structure.","PeriodicalId":11839,"journal":{"name":"Engineering Structures and Technologies","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.3846/2029882X.2017.1381044","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49623523","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}
Pub Date : 2017-06-14DOI: 10.3846/2029882X.2016.1277170
A. Kairytė, A. Ivdre, S. Vaitkus
Paper waste sludge (PWS) is the main and the greatest by-product in paper production process, and its elimination as well as destruction is a primary environmental problem. This research explores the feasibility of such wastes to be used in polyurethane foam composites. It is well known that using water as a sole blowing agent has major drawbacks such as long demould time, shrinkage, high diffusion rate of carbon dioxide and etc.; therefore, the bio-based propylene glycol (RPG) is used in order to solve such problems. The addition of 20 parts by weight (pbw) of RPG eliminates the primary shrinkage of the foam composites when PWS is used in the amount varying from 5% to 20%, and improves the dimensional stability at 70 oC and 90% relative humidity conditions. The addition of titanate coupling agent modified PWS particles increases the compressive strength of the final composites from 26% to 53%, from 17% to 31% and from 3% to 23% for, respectively, 10 pbw, 15 pbw and 20 pbw RPG extended foam composites.
{"title":"Dimensionally stable water-blown polyurethane foam extended with bio-based propylene glycol and modified with paper waste sludge","authors":"A. Kairytė, A. Ivdre, S. Vaitkus","doi":"10.3846/2029882X.2016.1277170","DOIUrl":"https://doi.org/10.3846/2029882X.2016.1277170","url":null,"abstract":"Paper waste sludge (PWS) is the main and the greatest by-product in paper production process, and its elimination as well as destruction is a primary environmental problem. This research explores the feasibility of such wastes to be used in polyurethane foam composites. It is well known that using water as a sole blowing agent has major drawbacks such as long demould time, shrinkage, high diffusion rate of carbon dioxide and etc.; therefore, the bio-based propylene glycol (RPG) is used in order to solve such problems. The addition of 20 parts by weight (pbw) of RPG eliminates the primary shrinkage of the foam composites when PWS is used in the amount varying from 5% to 20%, and improves the dimensional stability at 70 oC and 90% relative humidity conditions. The addition of titanate coupling agent modified PWS particles increases the compressive strength of the final composites from 26% to 53%, from 17% to 31% and from 3% to 23% for, respectively, 10 pbw, 15 pbw and 20 pbw RPG extended foam composites.","PeriodicalId":11839,"journal":{"name":"Engineering Structures and Technologies","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.3846/2029882X.2016.1277170","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42107860","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}
Pub Date : 2017-06-14DOI: 10.3846/2029882X.2017.1322919
Justas Slaitas, Z. Hlaváč, Arnoldas Šneideris
AbstractThis article examines flexural reinforced concrete structures condition assessment process in existing buildings on the stage where the reinforcement stress is between the yield and the tensile strength. The research is made on V. Jokūbaitis proposed methodology directly measuring the compression zone height, allowing us to evaluate the behavior of reinforced concrete beam fracture sufficiently precisely. This paper confirms the hypothesis that, when reinforcement reaches yielding stress, elastic strain dominates in concrete’s compression zone and it is reasonable to use triangular concrete compression zone diagram, without tensile concrete above crack evaluation. The methodology of reinforced concrete structures bearing capacity assessment according to limit normal section crack depth is proposed. There is established connection between bending moments, when reinforcement achieve yielding stress and tensile strength, which allows us to decide about structures bearing capacity reserve. The results...
{"title":"Flexural reinforced concrete elements normal section bearing capacity evaluation in fracture stage","authors":"Justas Slaitas, Z. Hlaváč, Arnoldas Šneideris","doi":"10.3846/2029882X.2017.1322919","DOIUrl":"https://doi.org/10.3846/2029882X.2017.1322919","url":null,"abstract":"AbstractThis article examines flexural reinforced concrete structures condition assessment process in existing buildings on the stage where the reinforcement stress is between the yield and the tensile strength. The research is made on V. Jokūbaitis proposed methodology directly measuring the compression zone height, allowing us to evaluate the behavior of reinforced concrete beam fracture sufficiently precisely. This paper confirms the hypothesis that, when reinforcement reaches yielding stress, elastic strain dominates in concrete’s compression zone and it is reasonable to use triangular concrete compression zone diagram, without tensile concrete above crack evaluation. The methodology of reinforced concrete structures bearing capacity assessment according to limit normal section crack depth is proposed. There is established connection between bending moments, when reinforcement achieve yielding stress and tensile strength, which allows us to decide about structures bearing capacity reserve. The results...","PeriodicalId":11839,"journal":{"name":"Engineering Structures and Technologies","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.3846/2029882X.2017.1322919","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42431736","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}
Pub Date : 2017-06-14DOI: 10.3846/2029882X.2017.1339296
I. Lill, Loreta Kanapeckiene, L. Tupėnaitė, Jurga Naimaviciene
AbstractRefurbishment of the building facades of residential buildings, including insulation, is often considered as the most energy efficient renovation measure with the largest potential. One of the solutions to increase energy efficiency is the selection of the appropriate insulation materials of the external walls. The article proposes the approach for selection of the insulation material based on SAW multiple criteria assessment method. The proposed methodology is applied for the case of insulation material selection in refurbishment of 12-storey building in Vilnius, Lithuania. Research reveals that rock wool outperforms other materials by thermal conductivity, light weigh, water vapour diffusion resistance, highest flammability class, durability and lowest emission of CO2 and is an efficient insulation to be used for sustainable refurbishment solutions.
{"title":"SELECTION OF THE INSULATION MATERIALS FOR REFURBISHMENT PURPOSES","authors":"I. Lill, Loreta Kanapeckiene, L. Tupėnaitė, Jurga Naimaviciene","doi":"10.3846/2029882X.2017.1339296","DOIUrl":"https://doi.org/10.3846/2029882X.2017.1339296","url":null,"abstract":"AbstractRefurbishment of the building facades of residential buildings, including insulation, is often considered as the most energy efficient renovation measure with the largest potential. One of the solutions to increase energy efficiency is the selection of the appropriate insulation materials of the external walls. The article proposes the approach for selection of the insulation material based on SAW multiple criteria assessment method. The proposed methodology is applied for the case of insulation material selection in refurbishment of 12-storey building in Vilnius, Lithuania. Research reveals that rock wool outperforms other materials by thermal conductivity, light weigh, water vapour diffusion resistance, highest flammability class, durability and lowest emission of CO2 and is an efficient insulation to be used for sustainable refurbishment solutions.","PeriodicalId":11839,"journal":{"name":"Engineering Structures and Technologies","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.3846/2029882X.2017.1339296","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46527691","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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