Engineering Structures and Technologies最新文献_第4页

A STUDY ON ANALYTICAL T-STUB PRYING MODELS FOR RHS JOINTS IN TENSION RHS节理受拉t形桩解析撬取模型研究

Engineering Structures and Technologies Pub Date : 2019-03-25 DOI: 10.3846/EST.2019.8854

Andrej Mudrov, G. Šaučiuvėnas, A. Šapalas

引用次数: 2

EFFECT OF AL2O3 NANOPARTICLES ON CORROSION BEHAVIOR OF ALUIMNUM ALLOY (AL-4.5 WT% CU-1.5 WT% MG) FABRICATED BY POWDER METALLURGY AL2O3纳米粒子对粉末冶金铝合金（AL-4.5wt%CU-1.5wt%MG）腐蚀行为的影响

Engineering Structures and Technologies Pub Date : 2019-03-25 DOI: 10.3846/EST.2019.8860

M. Abbass, Bassma Finner Sultan

{"title":"EFFECT OF AL2O3 NANOPARTICLES ON CORROSION BEHAVIOR OF ALUIMNUM ALLOY (AL-4.5 WT% CU-1.5 WT% MG) FABRICATED BY POWDER METALLURGY","authors":"M. Abbass, Bassma Finner Sultan","doi":"10.3846/EST.2019.8860","DOIUrl":"https://doi.org/10.3846/EST.2019.8860","url":null,"abstract":"In this research the effect of Al2O3 nanoparticles on corrosion behavior of aluminum base alloy (Al-4.5 wt% Cu-1.5 wt% Mg) has been investigated. Nanocomopsites reinforced with variable contents of 1, 3 and 5 wt% of Al2O3 nanoparticles were fabricated using powder metallurgy. All samples were prepared from the base alloy powders under the best powder metallurgy processing conditions of 6 hr of mixing time, 450 MPa of compaction pressure and 560 °C of sintering temperature. Density and micro hardness measurements, and electrochemical corrosion tests are performed for all prepared samples in 3.5 wt% NaCl solution at room temperature using potentiostate instrument. It has been found that density and micro hardness of the nanocomposite increase with increasing of wt% Al2O3 nanoparticles to Al matrix. It was found from Tafel extrapolation method that corrosion rates of the nanocomposites reinforced with alumina nanoparticles were lower than that of base alloy. From results of corrosion test by potentiodynamic cyclic polarization method, it was found the pitting corrosion resistance improves with adding of Al2O3 nanoparticles. It was noticed that the pits disappear and the hysteresis loop disappears also from anodic polarization curve.","PeriodicalId":11839,"journal":{"name":"Engineering Structures and Technologies","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43048057","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}

引用次数: 6

SHEAR CAPACITY PREDICTION FOR STIRRUP-CORRODED RC BEAMS STRENGTHENED WITH FRP FRP加固砼砼砼砼砼砼砼梁抗剪承载力预测

Engineering Structures and Technologies Pub Date : 2019-03-25 DOI: 10.3846/EST.2019.8885

A. El-Sayed

{"title":"SHEAR CAPACITY PREDICTION FOR STIRRUP-CORRODED RC BEAMS STRENGTHENED WITH FRP","authors":"A. El-Sayed","doi":"10.3846/EST.2019.8885","DOIUrl":"https://doi.org/10.3846/EST.2019.8885","url":null,"abstract":"Corrosion of steel reinforcement represents one of the main causes of deterioration and degradation of reinforced concrete (RC) structures. Shear reinforcements (stirrups) as an outer reinforcement in RC beams are more susceptible to corrosion problems and damage. This paper describes an analytical procedure for predicting the shear capacity of stirrup-corroded RC beams strengthened in shear using FRP laminates. The procedure shows how to incorporate the effects of the damages due to corrosion of stirrups into the design equations. An experimental investigation has been conducted to provide experimental data on the shear capacity of RC beams with corrosion-damaged stirrups strengthened using carbon fiber reinforced polymer (CFRP) sheets. The experimental study comprised three beams of 200 mm wide, 350 mm deep, and 2800 mm long. The steel stirrups in the beams were corroded using an accelerated corrosion technique. After CFRP strengthening, the beams were tested in four-point bending under a simply supported span of 2400 mm. The shear capacity of the strengthened beams was predicted using the proposed procedure and compared with the experimental ones. Good correlations were found between the predicted and experimental shear strength of the beams.","PeriodicalId":11839,"journal":{"name":"Engineering Structures and Technologies","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43912186","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}

引用次数: 2

COMPARATIVE ANALYSIS OF THE BUCKLING FACTOR OF THE STEEL ARCH BRIDGES 钢拱桥屈曲系数的对比分析

Engineering Structures and Technologies Pub Date : 2019-03-25 DOI: 10.3846/EST.2019.8856

Sigutė Žilėnaitė

{"title":"COMPARATIVE ANALYSIS OF THE BUCKLING FACTOR OF THE STEEL ARCH BRIDGES","authors":"Sigutė Žilėnaitė","doi":"10.3846/EST.2019.8856","DOIUrl":"https://doi.org/10.3846/EST.2019.8856","url":null,"abstract":"The dominant axial compressive force makes the arches become extremely sensitive to the loss of stability. Their stability analysis was first initiated in the late 20th century. The first stability research of single arches was carried out inplane at the elastic stage of the arches. Later the behaviour of arches in the elastic-plastic stage, the initial stresses and geometric imperfections before the arch buckles were also assessed, the effective length of the arches and the out-of-the-plane arch strength conditions were being identified as well as the effect of the temperature on the stability of the arch. The expression of the critical force of the arches connected by vertical hangers with a chord and its dependant elements were defined by Petersen in the late 20th century. The design methodology for the formal design of arches connected by vertical hangers with a stiffening girder is presented in Annex D of the Eurocode 1993-2. Nevertheless, the area of application and the main assumptions are not defined. The first part of the comparative analysis identifies the assumptions for arch bridge modelling under which the buckling factor β dependence curves in Figure D.4 of Annex D to Eurocode 1993-2 can be applied. In the second part a comparison of the the normative βEC factor value and the one established by the numerical experiment with the increase in the number of hangers and change in the hanger network form is presented.","PeriodicalId":11839,"journal":{"name":"Engineering Structures and Technologies","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46236868","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}

引用次数: 1

THE PRELIMINARY DESIGN AND TECHNICAL-ECONOMIC EFFICIENCY OF THE TWO-LEVEL BRANCHED CABLE-STAYED BRIDGE 两层分支斜拉桥的初步设计及技术经济效益

Engineering Structures and Technologies Pub Date : 2019-03-25 DOI: 10.3846/EST.2019.8858

Modestas Stragys

引用次数: 3

THE INFLUENCE OF PLASTICISING ADMIXTURES ON DRYING SHRINKAGE OF CEMENTITIOUS COMPOSITES 增塑外加剂对胶凝复合材料干燥收缩的影响

Engineering Structures and Technologies Pub Date : 2018-11-13 DOI: 10.3846/EST.2018.6482

G. Skripkiūnas, M. Macijauskas, G. Yakovlev, A. Ignatyeva

{"title":"THE INFLUENCE OF PLASTICISING ADMIXTURES ON DRYING SHRINKAGE OF CEMENTITIOUS COMPOSITES","authors":"G. Skripkiūnas, M. Macijauskas, G. Yakovlev, A. Ignatyeva","doi":"10.3846/EST.2018.6482","DOIUrl":"https://doi.org/10.3846/EST.2018.6482","url":null,"abstract":"This article presents a research into the impact of plasticising admixtures on drying shrinkage of cementitious composites by evaluating the effectiveness of plasticising. Materials used in the study: Portland cement CEM I 42.5 R, plasticiser LS (modified lignosulphonates based), superplasticiser PCE (synthetic polycarboxylate esters based), superplasticiser MAP (modified acrylic polymers based), sand and water. The percentage change of plastic viscosity of cement paste indicates the effectiveness of plasticising of cementitious composites. The change of plastic viscosity has been tested by adding a specific amount of plasticising admixtures. The effectiveness of plasticising of pastes were tested using rotational viscometer. Chemical admixtures content in pastes varied from 0 to 1.2%. Drying shrinkage was tested based on length change of the specimens with fine aggregates. The method to minimise drying shrinkage of composites was established through use of plasticising admixtures. It has been found that by increasing plasticising admixture dosage from 0 to 1.2% the following changes occur: LS plasticising effectiveness increases by 35% while drying shrinkage decreases by 8%; MAP plasticising effectiveness increases by 70% while drying shrinkage decreases by 16%; PCE plasticising effectiveness increases by 80% while drying shrinkage decreases by 20%.","PeriodicalId":11839,"journal":{"name":"Engineering Structures and Technologies","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41495497","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}

引用次数: 1

A SYSTEMATIC REVIEW OF INFORMATION MODELLING OF INDIVIDUAL RESIDENTIAL BUILDINGS 个别住宅建筑资讯模型的系统检讨

Engineering Structures and Technologies Pub Date : 2018-11-13 DOI: 10.3846/EST.2018.6479

Darius Kalibatas, D. Kalibatienė, O. Kapliński

{"title":"A SYSTEMATIC REVIEW OF INFORMATION MODELLING OF INDIVIDUAL RESIDENTIAL BUILDINGS","authors":"Darius Kalibatas, D. Kalibatienė, O. Kapliński","doi":"10.3846/EST.2018.6479","DOIUrl":"https://doi.org/10.3846/EST.2018.6479","url":null,"abstract":"Rapidly growing building information modelling (BIM) in construction offers a number of advantages and new opportunities of improving efficiency and effectiveness of the construction process and enhancing the use of emerging technology throughout the project’s lifecycle, not only in new buildings, but also in existing ones, including overall infrastructure. Recently, there has been a great number of publications discussing BIM advantages in construction. A number of review papers summarising BIM usage cases have been published. However, as the preliminary research shows, not all organizations use BIM because of its disadvantages. Therefore, the main aim of this research is to study the extent of available literature on BIM, to determine the current situation of BIM usage, and summarise publications related to the application of BIM. The current study is limited solely to papers available in SpringerLink, ScienceDirect and Thomson Reuters Web of Sciences scientific databases. The obtained results make it clear that BIM case studies and research in academic journals show high level of BIM implementation in practice, and advantages of BIM. However, there are some limitations of BIM usage in practice. Moreover, new trends in the evolving BIM are presented and discussed in this paper.","PeriodicalId":11839,"journal":{"name":"Engineering Structures and Technologies","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47098679","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}

引用次数: 4

THE APPLICATION OF THE FINITE ELEMENT METHOD FOR STATIC BEHAVIOUR ANALYSIS OF THE ASYMMETRICAL ONE-PYLON SUSPENSION BRIDGE BUILT-IN BENDING CABLES OF DIFFERENT RIGIDITY 应用有限元法对不同刚度的非对称单塔悬索桥内嵌弯曲索进行静力性能分析

Engineering Structures and Technologies Pub Date : 2018-11-13 DOI: 10.3846/EST.2018.6481

Tatjana Grigorjeva, A. Paeglitis

引用次数: 1

THE ANALYSIS OF RATIONAL COMPONENT PARAMETERS FOR STRESS RIBBON THROUGH STEEL ARCH FOOTBRIDGES 钢拱人行桥应力带合理构件参数分析

Engineering Structures and Technologies Pub Date : 2018-11-13 DOI: 10.3846/EST.2018.6480

Vilius Karieta

引用次数: 0

ANALYSIS OF SHEAR DESIGN RECOMMENDATIONS FOR FRP REINFORCED CONCRETE BEAMS FRP筋混凝土梁抗剪设计建议分析

Engineering Structures and Technologies Pub Date : 2018-11-13 DOI: 10.3846/EST.2018.6478

M. Budvytis, A. C. Escamilla, Linas Juknevičius

引用次数: 4