International Journal of Civil and Structural Engineering最新文献

An Analytical Hierarchy Process of Delay causes in Highway Construction Projects in Iran 伊朗公路建设项目延误原因的层次分析法

International Journal of Civil and Structural Engineering Pub Date : 2018-09-17 DOI: 10.15224/978-1-63248-150-4-27

Kiyanoosh Golchin Rad, Soo-Yong Kim

{"title":"An Analytical Hierarchy Process of Delay causes in Highway Construction Projects in Iran","authors":"Kiyanoosh Golchin Rad, Soo-Yong Kim","doi":"10.15224/978-1-63248-150-4-27","DOIUrl":"https://doi.org/10.15224/978-1-63248-150-4-27","url":null,"abstract":"Recently, the highway construction projects in Iran have been confronted with delay, terminated, or postponed for several years. Although widespread studies have been investigated, regarding to delay issue in developed and developing countries, however, only few studies addressed in Iran. Due to the importance of delay issue and lack of sufficient studies regarding to this topic in Iran, this study aimed to first, discover the most significant causes of delay in highway construction projects, second; prioritize, and rank the critical factors, in order to highlight them for highway construction projects authorities. A verified questionnaire prepared and distributed among the experts in the construction projects of Iran. The valid collected data analyzed by Exploratory Factor Analysis (EFA) to uncover the underlying structure of variables and reduce the number of them. Moreover, Analytical Hierarchy Process (AHP), as one of the prevalent decisions making tools, applied to prioritize and rank the significant factors. The study results revealed that the “Design” and “Contractor” were manifested as the most critical criteria regarding to delay in highway construction projects in Iran. Besides, poor procurement of construction materials, delay in manufacturing materials and accidents during construction were discovered as the most significant factors causing delay. This study contributed first to identify and prioritize the most significant causes of delay in construction projects in Iran, as a developing country, because of lack of sufficient studies regarding to this topic. Additionally it highlights the causes of delay for any involving parties in Iran construction projects in order to eliminate delay. Keywords—component, formatting, style, styling, insert (key words)","PeriodicalId":162063,"journal":{"name":"International Journal of Civil and Structural Engineering","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132230835","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: 0

Numerical Modelling of large diameter monopiles supporting OWT-Head stiffness assessment in Nonhomogeneous Soils 非均质土中大直径单桩owt头刚度评估的数值模拟

International Journal of Civil and Structural Engineering Pub Date : 2018-09-17 DOI: 10.15224/978-1-63248-150-4-34

A. Hemza, Amar Bouzid Djillali

{"title":"Numerical Modelling of large diameter monopiles supporting OWT-Head stiffness assessment in Nonhomogeneous Soils","authors":"A. Hemza, Amar Bouzid Djillali","doi":"10.15224/978-1-63248-150-4-34","DOIUrl":"https://doi.org/10.15224/978-1-63248-150-4-34","url":null,"abstract":"Many countries are now planning to build new wind farms with high capacity up to 5MW. Consequently, the size of the foundation increased. This kind of structures are subjected to fatigue damage from environmental loading mainly due to wind and waves as well as from cyclic loading imposed through the rotational frequency (1P) through mass and aerodynamic imbalances and from the blade passing frequency (3P) of the wind turbine which makes their behavior dynamically very sensitive. That is why natural frequency must be determined with accuracy in order to avoid the resonance of the system. This paper presents a numerical procedure which combines the finite element method based on the 2D discretization in the radial plane and the Fourier series based on expansion of displacements and forces in the circumferential direction. Firstly analytical expressions of stiffnesses of foundations with large diameter embedded in soils with different stiffness profile are established. Secondly and in order to check the accuracy of the proposed formulas, a mathematical model approach based on nondimensional parameters is used to calculate the natural frequency taking into account the soil structure interaction (SSI) compared with measured frequency in five wind farms selected from the litterature. Keywords—Offshore Wind Turbines; Semi-analytical FE analysis; DNV/Risø; Monopiles foundations; Natural frequency.","PeriodicalId":162063,"journal":{"name":"International Journal of Civil and Structural Engineering","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126323672","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: 0

Nanoindentation investigations of electrodeposited on steel substrate corrosion-protective zinc coating, additionally improved by Cr III conversion layer 电沉积钢基体上的纳米压痕研究

International Journal of Civil and Structural Engineering Pub Date : 2018-09-17 DOI: 10.15224/978-1-63248-150-4-35

D. Guergova, D. Stoychev, N. Boshkova, R. Iankov, S. Cherneva

{"title":"Nanoindentation investigations of electrodeposited on steel substrate corrosion-protective zinc coating, additionally improved by Cr III conversion layer","authors":"D. Guergova, D. Stoychev, N. Boshkova, R. Iankov, S. Cherneva","doi":"10.15224/978-1-63248-150-4-35","DOIUrl":"https://doi.org/10.15224/978-1-63248-150-4-35","url":null,"abstract":"The protective Zn coatings on steel substrates are preferable because the zinc layers play a role of “sacrificial coatings” due to their more negative electrode potential compared to steel substrate. Besides, their protective ability strongly depends from aggressive nature of environment, which determines the need of additional efforts. Vastly improvement of the chemical stability and protective ability of the Zn coatings give the additional treatments aiming the formation of “finishing“ conversion layer with desired chemical-resistant composition on the Zn surface influencing against corrosion attack. Having in mind the chemical nature of the conversion layers, it is possible to predict the improvement of the chemical and mechanical properties of the system “Conversion layer”/”Zinc coating”/”Steel substrate”. The present study shows the results obtained concerning the indentation modulus and indentation hardness of the Cr III conversion layers and their dependence in the depth of indentation for the studied systems. The thickness of the steel substrate, protective Zn coating and finishing conversion layer are 820, 5 and 0,15 μm, respectively. It was established that the system “Conversion layer”/”Zinc coating”/”Steel substrate” is characterized with higher indentation hardness and modulus than the system ”Zinc coating”/”Steel substrate”, which improves their wear resistance and corrosion protection. Keywords—nanoindentation, mechanical properties, corrosion-protective zinc coatings, conversion layers","PeriodicalId":162063,"journal":{"name":"International Journal of Civil and Structural Engineering","volume":"83 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114489779","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: 0

Effect of coral cell on beach deformation by 3-D hydraulic model experiment 珊瑚细胞对海滩变形影响的三维水力模型试验

International Journal of Civil and Structural Engineering Pub Date : 2018-08-19 DOI: 10.15224/978-1-63248-158-0-13

H. Park, Kwang-Soo Lee, K. Lim, Sang Kil Park

{"title":"Effect of coral cell on beach deformation by 3-D hydraulic model experiment","authors":"H. Park, Kwang-Soo Lee, K. Lim, Sang Kil Park","doi":"10.15224/978-1-63248-158-0-13","DOIUrl":"https://doi.org/10.15224/978-1-63248-158-0-13","url":null,"abstract":"Recently, coastal environmental pollution is getting serious. Among these, beach erosion has great a significant impact. These coastal structures are made to minimize the loss of sand beach. For this reason, submerged breakwater has been indiscriminately constructed that is planned throughout south korea. In order to prevent erosion, some advanced countries have been installed submerged breakwater or breakwater. Despite of its purpose to keep the shoreline of the beach, it has a quite a few problems. In addition, the purpose of utilizing the space of the marine leisure users does not like that because of the disconnection of the sea using sea space. These methods have resulted in a further erosion of the beach. Therefore, in this study, we propose to develop a economical method of artificial coral cell model that can mitigate degree rate of beach erosion and improve coastal environments without installing the submerged breakwater or breakwater for the maintenance. We compared and analyzed the topographic changes of the artificial coral reef method and the these methods through the 3-D hydraulic experiment. As a result of the experiment, we confirmed the superiority of the deformation effect of the coral cell over submerged breakwater, it demonstrated the effectiveness of prevention of loss of sand and improvement of water quality.","PeriodicalId":162063,"journal":{"name":"International Journal of Civil and Structural Engineering","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126487474","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: 0

Shear Behavior of Fiber Reinforced Concrete Beams Reinforced with Basalt FRP Bars 玄武岩FRP筋加固纤维混凝土梁的抗剪性能

International Journal of Civil and Structural Engineering Pub Date : 2017-12-10 DOI: 10.15224/978-1-63248-139-9-29

Abathar Al-Hamrani, N. Al-Nuaimi, W. Alnahhal

{"title":"Shear Behavior of Fiber Reinforced Concrete Beams Reinforced with Basalt FRP Bars","authors":"Abathar Al-Hamrani, N. Al-Nuaimi, W. Alnahhal","doi":"10.15224/978-1-63248-139-9-29","DOIUrl":"https://doi.org/10.15224/978-1-63248-139-9-29","url":null,"abstract":"This paper is focusing mainly on studying the shear behavior of basalt fiber reinforced concrete (BFRC) beams reinforced with basalt (BFRP) bars. Reinforced concrete beams reinforced with basalt bars were tested under shear loading test until failure. The beams were reinforced with sand coated BFRP bars as a flexural reinforcement, in addition to the discrete basalt macro-fibers, which were added to the concrete mix at two different volume fractions namely, 0.75%, and 1.5%. Two mixes with the aforementioned volume fractions were prepared and cured for 28 days before testing. The main parameters were the reinforcement ratio, the span to depth ratio and the volume fraction of discrete basalt minibars. Test Results showed a significant increase in the shear strength as the reinforcement ratio increases. In addition, using lower span to depth ratio resulted in an increase in the shear capacity. It has also revealed that using higher percentages of discrete basalt fibers enhanced the shear capacity, reduced the beam deflection, reduced the cracks width and propagation, and improved the beam ductility before failure. Keywords— Shear behavior, Basalt bars, Basalt macro-fibers, Beam ductility.","PeriodicalId":162063,"journal":{"name":"International Journal of Civil and Structural Engineering","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129917849","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

DEVELOPING A PUBLIC-PRIVATE PARTNERSHIP PERFORMANCE FRAMEWORK FOR TRANSPORT AND HEALTH SECTOR STAKEHOLDERS IN THE UK AND GHANA 为联合王国和加纳的运输和卫生部门利益攸关方制定公私伙伴关系绩效框架

International Journal of Civil and Structural Engineering Pub Date : 2017-09-02 DOI: 10.15224/978-1-63248-132-0-62

E. Donkoh, Martin Murphy, R. Eadie

{"title":"DEVELOPING A PUBLIC-PRIVATE PARTNERSHIP PERFORMANCE FRAMEWORK FOR TRANSPORT AND HEALTH SECTOR STAKEHOLDERS IN THE UK AND GHANA","authors":"E. Donkoh, Martin Murphy, R. Eadie","doi":"10.15224/978-1-63248-132-0-62","DOIUrl":"https://doi.org/10.15224/978-1-63248-132-0-62","url":null,"abstract":"Public Private Partnerships (PPP) have been used in the construction industry to deliver critical infrastructure projects in various sectors. PPPs performance improvement is a current stakeholder concern due to numerous project failures. This research compares PPPs transport and health sector infrastructure in the United Kingdom and Ghana to produce a sustainable performance improvement model. The research aim is twofold: first, to develop an empirical performance improvement model for PPP best practice implementation for the UK and Ghanaian transport and health sectors. Secondly, it will examine and compare the UK and Ghanaian PPP transport and health sector stakeholders’ Critical Success Factors (CSF) and risks. A rigorous literature review on complex IPs was conducted into PPP transport and health sectors to identify stakeholders CSF and risks in infrastructure sector projects. Four (4) Delphi expert panels and statistical analysis will be used to identify the CSF and risks for successful implementation. The proposed research will establish valuable information for the public and private sectors’ stakeholder interests when investing in transport and health infrastructure projects through PPP in both the UK and Ghanaian construction industries.","PeriodicalId":162063,"journal":{"name":"International Journal of Civil and Structural Engineering","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132247672","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: 0

Fatigue Analysis of Polyethylene Fuel Tanks Used in Buses 客车用聚乙烯油箱的疲劳分析

International Journal of Civil and Structural Engineering Pub Date : 2015-09-27 DOI: 10.15224/978-1-63248-070-5-48

E. Akay, Gokay Simitcioglu, H. Ustaoğlu, H. Türkmen, Sedat Süsler, S. Ayhun, Serter Atamer, V. Dogan, Y. Erginsoy, Z. Mecitoğlu

{"title":"Fatigue Analysis of Polyethylene Fuel Tanks Used in Buses","authors":"E. Akay, Gokay Simitcioglu, H. Ustaoğlu, H. Türkmen, Sedat Süsler, S. Ayhun, Serter Atamer, V. Dogan, Y. Erginsoy, Z. Mecitoğlu","doi":"10.15224/978-1-63248-070-5-48","DOIUrl":"https://doi.org/10.15224/978-1-63248-070-5-48","url":null,"abstract":"In this paper, the fatigue analysis part of a project which aims to develop a computer aided methodology for developing/designing of the polyethylene fuel tanks is presented. The fatigue performance of the polyethylene material based on the stress-life (S-N) approach is obtained by coupon tests. Dynamic “g forces”, which act on the fuel tanks as base excitations, are obtained from the specific bad road runway experiments by the Mercedes-Benz Turk (MBT) R&D Center. In the finite element simulation, dynamic stresses are obtained for different fullness ratios of the tank by using PERMAS V15. Fluid-structure interaction problem is also considered, fluid (fuel) is modeled with acoustic elements, and structure (tank) is modeled with shell elements. Fatigue life prediction of the fuel tank is conducted by using the FEMFAT (Finite Element Fatigue Analysis) program. After evaluating results, some geometry optimization is performed. Finally, all fatigue analysis results are compared with the hydro-pulse test results for validation. Keywords— polyethylene, finite element method, fatigue","PeriodicalId":162063,"journal":{"name":"International Journal of Civil and Structural Engineering","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114894764","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: 0

Mechanism of Bone-like Apatite Formation on Anodised Titanium under UV Irradiation 紫外线照射下阳极氧化钛表面形成骨状磷灰石的机理

International Journal of Civil and Structural Engineering Pub Date : 2015-05-27 DOI: 10.15224/978-1-63248-062-0-37

H. Abdullah, M. I. Idris, Te Chuan Lee

{"title":"Mechanism of Bone-like Apatite Formation on Anodised Titanium under UV Irradiation","authors":"H. Abdullah, M. I. Idris, Te Chuan Lee","doi":"10.15224/978-1-63248-062-0-37","DOIUrl":"https://doi.org/10.15224/978-1-63248-062-0-37","url":null,"abstract":"— Anodic oxidation is an electrochemical method for the production of ceramic films on a metallic substrate. It had been widely used to deposit the ceramic coatings on the metals surface. UV light was used to accelerate the bone-like apatite formation on the anodised titanium in this study. The processing was composed of two steps which were UV light treatment after anodic oxidation, and UV light illumination during simulated body fluid (SBF). This study aims to study the mechanism of bone-like apatite formation on the surface of anodised titanium under UV irradiation. High purity titanium foils were anodised at 350 V, 70 mA.cm -2 in electrolytic solution containing glycerophosphate disodium salt pentahydrate (β-GP) and calcium acetate monohydrate (CA) for 10 minutes. UV light treatment was conducted in pH-adjusted distilled water (pH 1) for 12 hours. Next, SBF was carried out by illuminating with UV lamp for 1 week. Anodised titanium foils were characterised by using field emission scanning electron microscopy (FESEM) and fourier transform infrared spectroscopy (FTIR). The results showed that bone-like apatite started to form at concave surface due to the presence of nucleation site. The surface of anodised titanium was fully covered by bone-like apatite after soaking in SBF for 4 days. Denser bone-like apatite was formed after 7 days immersion in SBF. The mechanism of the growth of bone-like apatite was illustrated. The FTIR results showed that carbonated bone-like apatite was formed on the surface on anodised titanium. The result indicated that the anodised titanium in mixture of β-GP + CA possess excellent apatite-forming ability under UV irradiation.","PeriodicalId":162063,"journal":{"name":"International Journal of Civil and Structural Engineering","volume":"89 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127892820","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

Surface Characterisation of Bioactive Titanium Formed Via Anodic Oxidation 阳极氧化制备生物活性钛的表面表征

International Journal of Civil and Structural Engineering Pub Date : 2015-05-27 DOI: 10.15224/978-1-63248-062-0-33

H. Abdullah, M. A. Selimin, M. I. Idris, N. Anjang, Z. Malik

{"title":"Surface Characterisation of Bioactive Titanium Formed Via Anodic Oxidation","authors":"H. Abdullah, M. A. Selimin, M. I. Idris, N. Anjang, Z. Malik","doi":"10.15224/978-1-63248-062-0-33","DOIUrl":"https://doi.org/10.15224/978-1-63248-062-0-33","url":null,"abstract":"Anodic oxidation (AO) is one of surface modification method that able to produce specific topographies and enhance bone growth of the titanium (Ti). Modifying the oxide layer of titanium from smooth (bioinert) to rough/porous (bioactive) surface makes this material able to be used as artificial implant for biomedical application. In this study, the effect of AO on the characteristics of titanium in different electrolytes is evaluated. Anodised Ti was prepared using AO method in two different electrolytes (acetic and sulphuric acid) with same concentration (0.3 M). The applied voltage were varied range 50 – 200 V, with constant 75 mA.cm-2 of current density for 10 min of oxidation process at room temperature. The anodised titanium films were characterised using X-ray Diffractometer (XRD), field emission scanning electron microscopy (FESEM) and atomic force microscopy (AFM). From this study, it is proven that the strong acid (sulphuric acid) is more effective to be used as electrolyte in order to produce rougher surface (formation of anatase and rutile) compared to weak acid (acetic acid) which able to produce small amount of anatase only","PeriodicalId":162063,"journal":{"name":"International Journal of Civil and Structural Engineering","volume":"2021 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122729769","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

Asphalt concrete mixture with recycled aggregates and modified bitumen at reduced temperature 由再生骨料和改性沥青在降低温度下混合而成的沥青混凝土

International Journal of Civil and Structural Engineering Pub Date : 2015-05-27 DOI: 10.15224/978-1-63248-062-0-34

P. Gonzalez, M. A. Pérez, I. I. Vega, D. Fresno, Angel Vega Zamanillo

引用次数: 0