Roads and Bridges-Drogi i Mosty最新文献_第5页

Characteristics of concrete mix air-entrainment applying the sequential pressure method 应用序贯压力法研究混凝土掺合物的掺气特性

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Roads and Bridges-Drogi i Mosty Pub Date : 2020-06-30 DOI: 10.7409/RABDIM.020.007

K. Dziedzic, M. Dąbrowski, A. Antolik, A. Glinicki

引用次数: 3

Multi-factor method of comparison of the geometrical condition of railway tracks on bridges and tests sections 桥梁与试验段轨道几何状况的多因素比较方法

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Roads and Bridges-Drogi i Mosty Pub Date : 2020-06-30 DOI: 10.7409/RABDIM.020.008

H. Bałuch

引用次数: 0

Testing the cement, hydrated lime and cement by-pass dust mixtures hydration 水泥、水化石灰和水泥旁通粉尘混合料水化试验

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Roads and Bridges-Drogi i Mosty Pub Date : 2020-06-30 DOI: 10.7409/RABDIM.020.009

Z. Owsiak, P. Czapik, J. Zapała-Sławeta

引用次数: 7

Effect of various de-icers containing chloride ions on scaling resistance and chloride penetration depth of highway concrete 含氯离子的各种除冰剂对公路混凝土抗结垢性及氯离子渗透深度的影响

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Roads and Bridges-Drogi i Mosty Pub Date : 2020-03-31 DOI: 10.7409/RABDIM.020.003

P. Reiterman, M. Keppert

引用次数: 10

Application of the new viscoelastic method of thermal stress calculation to the analysis of low-temperature cracking of ashpalt layers 热应力计算的粘弹性新方法在灰泥层低温开裂分析中的应用

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Roads and Bridges-Drogi i Mosty Pub Date : 2020-03-31 DOI: 10.7409/RABDIM.020.002

J. Judycki

引用次数: 3

Study of the temperature field and the thermo-elastic state of the multilayer soil-steel structure 多层钢-土结构温度场及热弹性状态研究

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Roads and Bridges-Drogi i Mosty Pub Date : 2020-03-31 DOI: 10.7409/RABDIM.020.004

V. Kovalchuk, Yuriy Hnativ, J. Luchko, M. Sysyn

引用次数: 11

Differences between the traffic model and the actual road traffic and its structure 交通模型与实际道路交通及其结构的差异

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Roads and Bridges-Drogi i Mosty Pub Date : 2020-03-31 DOI: 10.7409/RABDIM.020.005

Agnieszka Łukasiewicz, M. Świtała

引用次数: 0

Causes of the Morandi viaduct disaster in Genoa as a contribution to the design of pre-stressed structures 热那亚莫兰迪高架桥灾难的原因，对预应力结构设计的贡献

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Roads and Bridges-Drogi i Mosty Pub Date : 2020-03-31 DOI: 10.7409//RABDIM.020.001

J. Rymsza

{"title":"Causes of the Morandi viaduct disaster in Genoa as a contribution to the design of pre-stressed structures","authors":"J. Rymsza","doi":"10.7409//RABDIM.020.001","DOIUrl":"https://doi.org/10.7409//RABDIM.020.001","url":null,"abstract":"The article analyses the causes of the Morandi viaduct disaster in Genoa. This three-span viaduct was a part of the A10 motorway leading to Savona. The structure of the viaduct supports was unusual. A pylon to each of the frame support was added and cantilevers to each pylon by means of a pair of suspended cables. The construction of the cable used was also atypical. The concreted cable had a rectangular cross-section and was a steel and concrete composite element. The concrete in this element was compressed with steel tendons so that it could transfer the tensile forces generated by the traffic load. The durability of the concreted cable subjected to tension was low. The article provides information on the technical condition of the viaduct and the way of strengthening the cables in the early 1990s. At that time, the author of the article visited this structure. He had a different concept of reinforcement than the one that was implemented. In August 2018, the viaduct disaster occurred, as a result of which one of the structure supports collapsed, and in June 2019, during the demolition process, the other two supports were blown up. Since in Venezuela and Libya there are still two more bridges with a structure similar to that in Italy, the concept of reinforcing them, as proposed by the author of the article 25 years ago, may still be useful.","PeriodicalId":44000,"journal":{"name":"Roads and Bridges-Drogi i Mosty","volume":"1 1","pages":"5-25"},"PeriodicalIF":0.5,"publicationDate":"2020-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83133116","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

Analysis of flexible pavement performance prediction models based on structural behaviour 基于结构性能的柔性路面性能预测模型分析

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Roads and Bridges-Drogi i Mosty Pub Date : 2019-12-31 DOI: 10.7409/RABDIM.019.017

Paulius Paplauskas, A. Vaitkus, R. Kleizienė

引用次数: 0

The assessment of stability at compression of steel pipes considering effects of uniform corrosion 考虑均匀腐蚀影响的钢管压缩稳定性评价

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Roads and Bridges-Drogi i Mosty Pub Date : 2019-12-31 DOI: 10.7409/RABDIM.019.018

A. Glinicka, S. Imiełowski

{"title":"The assessment of stability at compression of steel pipes considering effects of uniform corrosion","authors":"A. Glinicka, S. Imiełowski","doi":"10.7409/RABDIM.019.018","DOIUrl":"https://doi.org/10.7409/RABDIM.019.018","url":null,"abstract":"In aggressive environments structural steel components of engineering structures may become affected by corrosion. Even with corrosion protection, their critical load capacity and stability are seriously affected by the consequences of corrosion in aggressive environments due to impurities and possible failures. In this paper a critical state analysis of corroded struts is presented. The input data for the analysis was taken from laboratory corrosion tests in which steel pipes of a few different diameters were subjected to the attack of sulphuric and hydrochloric acids and placed in salt spray tester. The loss of material due to corrosion was determined and graphs, presenting the loss of material as a function of pipe diameter and the corrosion rate over time, were determined. The relative decrease of the maximum elastic strain energy which can be stored in the strut and the relative decrease of the critical load of elastic buckling were calculated for a series of corroded pipes. The curves of the relative change of the maximum elastic strain energy and the relative change of critical load over the time of corrosion progression were found to follow a similar path. For determining the critical load for a given strut, boundary conditions are taken into consideration. However, it is not necessary in the case of maximum elastic strain energy, which makes it a more convenient stability measure of the critical load capacity of strut.","PeriodicalId":44000,"journal":{"name":"Roads and Bridges-Drogi i Mosty","volume":"1 1","pages":"267-281"},"PeriodicalIF":0.5,"publicationDate":"2019-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74478096","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