Romanian Journal of Transport Infrastructure最新文献_第9页

Flexible Pavement Design Criterion Based on Octahedral Shear Stresses 基于八面体剪切应力的柔性路面设计准则

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Romanian Journal of Transport Infrastructure Pub Date : 2017-07-01 DOI: 10.1515/rjti-2017-0054

Ş. Lazăr, C. Răcănel

{"title":"Flexible Pavement Design Criterion Based on Octahedral Shear Stresses","authors":"Ş. Lazăr, C. Răcănel","doi":"10.1515/rjti-2017-0054","DOIUrl":"https://doi.org/10.1515/rjti-2017-0054","url":null,"abstract":"Abstract The judicious pavement design is the key factor in achieving the longest service life and the lowest maintenance and rehabilitation costs. It is based on the consideration of the phenomena in which the pavement structures are subjected to exploitation and the limitation of their destructive effects. The aim of this study is to verify the possibility of implementing in the flexible pavement structures design practice of another design criterion based on limiting the bituminous mixtures creep phenomenon and that to be called: The criterion of admissible octahedral shear stresses in the bituminous layers. Estimation of octahedral shear stresses is done with a calculation model based on finite element method, and hereafter referred to as 2D ASFEM (2D Axi-Symmetric Finite Element Model). The paper presents the results obtained by modeling several specific calculation assumptions for the behaviour of flexible pavement structures in service. The study underlines the fact that the Octahedral Shear Stresses Ratio (OSSR) can be an additional design criterion to be taken into account when designing flexible pavement structures alongside other established criteria.","PeriodicalId":40630,"journal":{"name":"Romanian Journal of Transport Infrastructure","volume":"6 1","pages":"54 - 65"},"PeriodicalIF":0.1,"publicationDate":"2017-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/rjti-2017-0054","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49455443","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

Considerations on the Benefits of Using Recyclable Materials for Road Construction 关于道路建设中使用可回收材料的好处的考虑

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Romanian Journal of Transport Infrastructure Pub Date : 2017-07-01 DOI: 10.1515/rjti-2017-0053

D. Popescu, A. Burlacu

引用次数: 8

Numerical Models used for The Calculation of The Cable-Stayed Bridge at Km 0+540 over Danube-Black Sea Canal 多瑙河-黑海运河0+540 Km斜拉桥计算的数值模型

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Romanian Journal of Transport Infrastructure Pub Date : 2016-12-01 DOI: 10.1515/rjti-2016-0047

C. Mutu, I. Răcănel

{"title":"Numerical Models used for The Calculation of The Cable-Stayed Bridge at Km 0+540 over Danube-Black Sea Canal","authors":"C. Mutu, I. Răcănel","doi":"10.1515/rjti-2016-0047","DOIUrl":"https://doi.org/10.1515/rjti-2016-0047","url":null,"abstract":"Abstract Cable-stayed bridges are complex structures and for their design, the traditional calculation methods are hard, even impossible to use for a global analysis. Separate analyses for the each component of the bridge in a simplified manner can be conducted, but in this case the concurrence of the elements into the structure is not taken into account, leading to errors in estimating the structural response. For these structures, the construction method and the presence of the stays, which are elements having a nonlinear behaviour, implies to consider a nonlinear staged analysis including the second order effects in order to transmit form one stage to the other the stress-strain state. In the present time, thanks to the evolution and development of the calculation methods and computer analysis, cable-stayed bridges can be accurate analysed so that the obtained response is close to the behaviour of the structure during erection and later, in service. The aim of this paper is to present the results obtained using one of the finite element models and nonlinear staged analysis of the bridge at km 0+540 over Danube-Black Sea Canal near Agigea. Inside the paper, results related to the evolution of stress-strain state in principal structural elements of the bridge - pylons, stays and deck - during the execution and in final stage, in service are to be presented.","PeriodicalId":40630,"journal":{"name":"Romanian Journal of Transport Infrastructure","volume":"5 1","pages":"37 - 49"},"PeriodicalIF":0.1,"publicationDate":"2016-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/rjti-2016-0047","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66974157","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

Research Concerning The Distribution of Temperature in Asphalt Mixtures with The Help of Thermo-Physical Characteristics for Laboratory Tests 基于热物理特性的沥青混合料温度分布研究

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Romanian Journal of Transport Infrastructure Pub Date : 2016-12-01 DOI: 10.1515/rjti-2016-0046

P. Marc, C. Costescu

引用次数: 0

“Warm Mix Asphalt’’ for Airport Use 机场用“温拌沥青”

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Romanian Journal of Transport Infrastructure Pub Date : 2016-12-01 DOI: 10.1515/rjti-2016-0048

C. Petcu, C. Răcănel

引用次数: 0

The Roller-Ground Dynamic Interaction in The Compaction Process Through Vibrations for Road Construction 道路施工中振动压实过程中压路机与地面的动力相互作用

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Romanian Journal of Transport Infrastructure Pub Date : 2016-12-01 DOI: 10.1515/rjti-2016-0044

Bejan Sergiu

引用次数: 7

Improved Prioritization Criteria for Road Infrastructure Projects 改进道路基础设施项目优先排序标准

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Romanian Journal of Transport Infrastructure Pub Date : 2016-12-01 DOI: 10.1515/rjti-2016-0045

Heroiu Marcel Ionescu, S. Burduja, F. Burlacu

{"title":"Improved Prioritization Criteria for Road Infrastructure Projects","authors":"Heroiu Marcel Ionescu, S. Burduja, F. Burlacu","doi":"10.1515/rjti-2016-0045","DOIUrl":"https://doi.org/10.1515/rjti-2016-0045","url":null,"abstract":"Abstract This report’s main aim is to propose a methodology for assessing state-budget-funded projects based on a rigorous selection model, including clear and effective prioritization criteria. This report first argues that project prioritization and selection should be optimized against four dimensions: absorption, impact, legitimacy, and capacity. Second, it provides a diagnostic of the National Program for Local Development (PNDL), managed by the Ministry of Regional Development and Public Administration (MRDPA), as the most significant source of state-budget funding for local infrastructure projects. The PNDL’s current design and implementation leaves room for improvement, as reflected by the lack of strategic direction in allocating funds and the continued rise in the number of projects that get started without a feasible timeline for their completion. Further, this report makes recommendations for improvement of project evaluation and selection procedures for local infrastructure development projects, with a special focus on prioritization criteria and viable funding sources for each type of investment. The practical purpose is to enhance the efficiency and effectiveness of proposed investments, maximizing impact in the context of inherently limited available financial resources. A complementary focus is on opportunities for harmonizing and better coordinating investments across various sources of funding, in the context of nearly EUR 40 billion available to Romania from the EU for the 2014-2020 programming period.","PeriodicalId":40630,"journal":{"name":"Romanian Journal of Transport Infrastructure","volume":"5 1","pages":"10 - 27"},"PeriodicalIF":0.1,"publicationDate":"2016-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/rjti-2016-0045","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66973674","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

The Influence of The Static Layout on The Stress and Deformation State for Concrete Arched Bridges with Upper Carriageway 静布置对上行车道混凝土拱桥应力和变形状态的影响

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Romanian Journal of Transport Infrastructure Pub Date : 2016-12-01 DOI: 10.1515/rjti-2016-0049

I. Vlad, C. Chiotan

{"title":"The Influence of The Static Layout on The Stress and Deformation State for Concrete Arched Bridges with Upper Carriageway","authors":"I. Vlad, C. Chiotan","doi":"10.1515/rjti-2016-0049","DOIUrl":"https://doi.org/10.1515/rjti-2016-0049","url":null,"abstract":"Abstract Arch bridges were the first constructions with considerable spans built by man, due to the materials and technologies available at that time. Afterwards, these works of art have diversified and are now solutions used in countless situations, especially when crossing deep valleys. Both their economic and architectonic aspects are hard to combat and have led to selecting this type of structure for more and more locations. The paper will contain a brief presentation of some aspects regarding upper path concrete arch bridges composition and design methods. Also, it will have a case study regarding structural stresses over the different construction stages, and for several support hypotheses. The case study will reflect the Crivadia viaduct, situated on DN 66, at km 150+672. The bridge has a main span of 59.20m and an overall height of 15.00m, serving a 7.80m wide carriageway and two 2.20m wide footways. It has a total length of 107.60m. Based on the results of the case study, conclusions will be drawn regarding stress variation over the construction stages and under different support hypothesis, comparing these with the initial results.","PeriodicalId":40630,"journal":{"name":"Romanian Journal of Transport Infrastructure","volume":"5 1","pages":"61 - 74"},"PeriodicalIF":0.1,"publicationDate":"2016-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/rjti-2016-0049","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66974227","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

Concepts and new perspectives for long span bridges 大跨度桥梁的概念和新视角

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Romanian Journal of Transport Infrastructure Pub Date : 2016-07-01 DOI: 10.1515/rjti-2016-0043

F. Brancaleoni

引用次数: 2

Checking the low track lattice girder bridges for robustness 检查低轨格梁桥的坚固性

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Romanian Journal of Transport Infrastructure Pub Date : 2016-07-01 DOI: 10.1515/rjti-2016-0038

C. Bucur

引用次数: 0