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Effect of Various Groins in a Series on Channel Bed Morphology: an Experimental Investigation 一系列不同腹沟对河床形态影响的实验研究
Stavební obzor - Civil Engineering Journal Pub Date : 2022-04-30 DOI: 10.14311/cej.2022.01.0016
Alauddin Mohammed, Rokshana Pervin, Md. Zakir Hasan
{"title":"Effect of Various Groins in a Series on Channel Bed Morphology: an Experimental Investigation","authors":"Alauddin Mohammed, Rokshana Pervin, Md. Zakir Hasan","doi":"10.14311/cej.2022.01.0016","DOIUrl":"https://doi.org/10.14311/cej.2022.01.0016","url":null,"abstract":"Alluvial rivers in Bangladesh are unstable keep changing their main channel, banklines, and so on. Groins are extensively used worldwide for shore protection from erosion, river navigation, beach reclamation among many other services. Improving the performance of groins is a crucial issue around the glove. Experimental investigations under clear water scour conditions have been conducted in this research to compare the performance of different groins in order to find out the suitable design of a groin. From the experimental runs, it is revealed that the groin models of different configurations behave in different ways. In the case of a solid I-shaped groin, a huge scour near the groin head and irregular bed pattern develop in the channel bed. While L-head and hockey-shaped groins improve the channel response a bit leading to decreased scour. Moreover, the hockey-shaped groin attracts the flow, and thus requires groin installation closely. The scour hole for a combined groin is relatively very small. As the scour endangers the stability of the groin structure, this turns out to be the most suitable one.","PeriodicalId":21974,"journal":{"name":"Stavební obzor - Civil Engineering Journal","volume":"11 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75008538","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
Service Life Prediction of Basalt Fiber Reinforced Concrete under Salt Freeze-thaw Cycles 盐冻融循环作用下玄武岩纤维混凝土寿命预测
Stavební obzor - Civil Engineering Journal Pub Date : 2022-04-30 DOI: 10.14311/cej.2022.01.0017
Wen-bin Xu, Zhirui Li
{"title":"Service Life Prediction of Basalt Fiber Reinforced Concrete under Salt Freeze-thaw Cycles","authors":"Wen-bin Xu, Zhirui Li","doi":"10.14311/cej.2022.01.0017","DOIUrl":"https://doi.org/10.14311/cej.2022.01.0017","url":null,"abstract":"To address the reduced durability of concrete structures under salt freeze-thaw erosion in Northwest China, basalt fiber reinforced concrete and common concrete with different mixing amounts were selected to predict their service life in three freeze-thaw conditions. Results showed that the damage on concrete under fresh water freeze-thaw condition is lower than that caused by salt freeze-thaw erosion, the addition of basalt fiber can effectively slow down the degradation of mechanical properties of concrete under salt freeze-thaw erosion, and the lowest degradation rate is reached when the content of basalt fiber is 0.15%. Fiber hinders the expansion of cracks and reduces the pores, and in turn improves the frost resistance durability of concrete. The service life prediction results obtained with Gray Model and Weibull Model are roughly similar, among which, Gray Model needs less sample volume, while Weibull Model presents more accurate prediction results.","PeriodicalId":21974,"journal":{"name":"Stavební obzor - Civil Engineering Journal","volume":"27 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83137932","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
MECHANICAL BEHAVIOR OF COMPOSITIONS OF GLASS-FIBER REINFORCED PLASTIC MORTAR PIPES BASED ON THEIR FUNCTIONING 基于功能的玻璃纤维增强塑料砂浆管组合物力学行为
Stavební obzor - Civil Engineering Journal Pub Date : 2022-04-30 DOI: 10.14311/cej.2022.01.0004
H. Shi, Chong Xue, Feng Qiao, Yancang Li
{"title":"MECHANICAL BEHAVIOR OF COMPOSITIONS OF GLASS-FIBER REINFORCED PLASTIC MORTAR PIPES BASED ON THEIR FUNCTIONING","authors":"H. Shi, Chong Xue, Feng Qiao, Yancang Li","doi":"10.14311/cej.2022.01.0004","DOIUrl":"https://doi.org/10.14311/cej.2022.01.0004","url":null,"abstract":"The experimental investigation on the mechanical parameters compositions of glass-fiber reinforced plastic mortar (GRPM) pipe is the basis of simulating and analyzing the mechanical characteristics of the complete structure of GRPM pipe. Due to the anisotropic material properties of GRPM pipe, the compressive property test is carried out, and the results show that the circumferential compressive strength(CCS) is 49.93Mpa, the axial compressive strength(ACS) is 40.79Mpa, the circumferential elastic modulus(CEM) is 4.84Gpa, and the axial elastic modulus(AEM) is 4.04Gpa. The difference between the CCS and ACS and EM is about 20%, as well as the CCS and EM are greater than the ACS and modulus of elasticity. Conclusions drawn from the tests provide an important basis for checking whether the materials meet the design requirements. \u0000 ","PeriodicalId":21974,"journal":{"name":"Stavební obzor - Civil Engineering Journal","volume":"32 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81085630","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
DESIGN AND RESEARCH OF ELECTRIC BRICKS TRANSPORTING CAR IN NON FIRED BRICKS FACTORY 非烧砖厂电动运砖车的设计与研究
Stavební obzor - Civil Engineering Journal Pub Date : 2022-04-30 DOI: 10.14311/cej.2022.01.0010
Lin Li
{"title":"DESIGN AND RESEARCH OF ELECTRIC BRICKS TRANSPORTING CAR IN NON FIRED BRICKS FACTORY","authors":"Lin Li","doi":"10.14311/cej.2022.01.0010","DOIUrl":"https://doi.org/10.14311/cej.2022.01.0010","url":null,"abstract":"Under the background of building energy saving, unburned bricks emerge as the time requires. The non-fired bricks need to be transported to the maintenance site by transporting equipment after being pressed and moulded, but now the transporting equipment in our country is simple and inefficient. In order to improve the production efficiency and promote the development of non-fired brick industry, the scheme of electric brick cart in this paper is put forward. This paper is centered on the design of electric brick cart. Firstly, the shortcomings of existing brick conveying equipment and the areas needing improvement are expounded, and the main research contents and the main structure scheme are put forward. Specific design includes structure design of main frame and loading car, calculation and selection of lifting system and motor, reducer and chain, calculation and selection of driving system, calculation and selection of motor and chain, selection and design of steering system and braking system. Finally, finite element analysis of bearing components is carried out and the design is summarized. The electric brick car designed in this paper has the advantages of energy saving, environmental protection, high transportation efficiency, simple operation, and can bring higher benefits to the brick factory without burning, and has broad application prospects.","PeriodicalId":21974,"journal":{"name":"Stavební obzor - Civil Engineering Journal","volume":"63 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73251823","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
STUDY ON MECHANICAL BEHAVIOR OF CABLE - STAYED BRIDGE SUPPORT SYSTEM IN MULTI - FULCRUM UNBALANCED ROTATION 多支点不平衡旋转斜拉桥支撑体系力学行为研究
Stavební obzor - Civil Engineering Journal Pub Date : 2022-04-30 DOI: 10.14311/cej.2022.01.0002
Zi-En Gu, Quansheng Sun, Meng Liu, D. Kong, Yang Guo
{"title":"STUDY ON MECHANICAL BEHAVIOR OF CABLE - STAYED BRIDGE SUPPORT SYSTEM IN MULTI - FULCRUM UNBALANCED ROTATION","authors":"Zi-En Gu, Quansheng Sun, Meng Liu, D. Kong, Yang Guo","doi":"10.14311/cej.2022.01.0002","DOIUrl":"https://doi.org/10.14311/cej.2022.01.0002","url":null,"abstract":"With the maturity and wide application of the bridge rotation construction technology, the single-fulcrum spherical hinge balance rotation can not meet the need of crossing over the high-speed railway catenary and other obstacles, so the unbalanced rotation construction is often needed. In order to ensure the stability and safety of the unbalanced rotation process, a multi-pivot rotation method is proposed. In this paper, the railway cable-stayed bridge over Harbin West Avenue is taken as the research object, and the multi-fulcrum rotating construction method over the metal contact network is adopted. The Abaqus finite element model is established, the influence of different rotation angular velocity, friction coefficient of slideway and position of support foot on the force of support system in the course of rotation is studied. The results show that, compared with the traditional single-pivot rotation, the force on the multi-pivot rotation support foot becomes the main force component, and the force on the spherical hinge decreases. The rotation angular velocity is positively correlated with Mises stress of the support foot and the spherical hinge. The friction coefficient of the slideway has a great influence on the force of the support foot. When the friction coefficient of the slideway changes in order of 0.02,0.04,0.06,0.08 and 0.1, the friction stress of the outer edge of the support foot increases linearly. Considering the force of spherical hinge and support foot, the best position of supporting foot is 7.3 m from the center of spherical hinge. The research in this paper can be used for reference in the future multi-pivot unbalanced rotation construction.","PeriodicalId":21974,"journal":{"name":"Stavební obzor - Civil Engineering Journal","volume":"5 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82492481","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
Knowledge Mapping Analysis of Digital Photogrammetry Research Using CiteSpace 基于CiteSpace的数字摄影测量研究的知识图谱分析
Stavební obzor - Civil Engineering Journal Pub Date : 2022-04-30 DOI: 10.14311/cej.2022.01.0014
Yongquan Ge, Yingchun Liu, Xiaodong Liu
{"title":"Knowledge Mapping Analysis of Digital Photogrammetry Research Using CiteSpace","authors":"Yongquan Ge, Yingchun Liu, Xiaodong Liu","doi":"10.14311/cej.2022.01.0014","DOIUrl":"https://doi.org/10.14311/cej.2022.01.0014","url":null,"abstract":"In order to clearly understand the current status and application trends of digital photogrammetry domestic and overseas research, taking the core journals of Web of Science as the data source, using bibliometric methods and CiteSpace to carry out statistical analysis of the relevant literature of digital photogrammetry research. The results show that since 2011, the research literature on digital photogrammetry has shown a steady growth year by year.  Digital photogrammetry is most closely related to the three disciplines of geology, earth science integration, and physical geography; countries such as the United States, the United Kingdom, Italy, and China publish the most papers, and these countries have strong research capabilities. Lane SN and Chandler JH have been shared with a high number of citations, who are representative scholars in this field; Digital photogrammetry contains multiple research directions. This article studies the research hotspots and frontiers of digital photogrammetry through keyword co-occurrence analysis and mutation detection analysis.","PeriodicalId":21974,"journal":{"name":"Stavební obzor - Civil Engineering Journal","volume":"30 4 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89085410","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 ON INFLUENCING FACTOR OF COST CONTROL OF EPC PROJECT BASED ON THE DEMATEL-ISM 基于dematel理论的epc项目成本控制影响因素分析
Stavební obzor - Civil Engineering Journal Pub Date : 2022-04-30 DOI: 10.14311/cej.2022.01.0006
Lin Li
{"title":"ANALYSIS ON INFLUENCING FACTOR OF COST CONTROL OF EPC PROJECT BASED ON THE DEMATEL-ISM","authors":"Lin Li","doi":"10.14311/cej.2022.01.0006","DOIUrl":"https://doi.org/10.14311/cej.2022.01.0006","url":null,"abstract":"The paper selects the influencing factors of EPC project’s cost control，analyzes and constructs the model of EPC project’s cost control from the point of view of system engineering，and utilizes the integrating DEMATEL—ISM method to study the relationships between the influencing factors and their impacts on cost control. And it gets the multilevel structure model of the influencing factors of EPC project’s cost control. The results show that project construction management level, procurement system, procurement process and standards project content acceptance and project settlement basis are the direct impacting factors of EPC project’s cost control. The study provides a reference of EPC project’s enterprises to improve project management level，effectively control project cost and achieve project management objectives.","PeriodicalId":21974,"journal":{"name":"Stavební obzor - Civil Engineering Journal","volume":"35 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83057979","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
EXAMINED AND ANALYSIS OF EMPIRICAL SEISMIC DAMAGE OF WORKSHOP BUILDING 厂房的经验震害检验与分析
Stavební obzor - Civil Engineering Journal Pub Date : 2022-04-30 DOI: 10.14311/cej.2022.01.0013
Si-Qi Li, Yongsheng Chen, Hong-bo Liu
{"title":"EXAMINED AND ANALYSIS OF EMPIRICAL SEISMIC DAMAGE OF WORKSHOP BUILDING","authors":"Si-Qi Li, Yongsheng Chen, Hong-bo Liu","doi":"10.14311/cej.2022.01.0013","DOIUrl":"https://doi.org/10.14311/cej.2022.01.0013","url":null,"abstract":"To deeply explore the typical damage characteristics and vulnerability characteristics of workshop building (WB) in actual earthquakes, the empirical field reconnaissance and observation of the WB damaged to varying degrees in the Mw 8.0 earthquake in Wenchuan County, Sichuan Province, China on May 12, 2008 were conducted. The investigation results indicated that the typical seismic damage forms of industrial buildings in multiple intensity regions were: local and overall collapse, column cracking and crane beam displacement, collapse and cracking of wall, and damage of supporting and connecting members, the field investigation pictures of typical seismic damage were provided, respectively. According to different typical failure characteristics, the seismic damage mechanism and seismic capacity were analyzed, and the measures and suggestions to improve the seismic capacity of industrial buildings with different material categories were conducted. The conclusions can provide necessary reference for the revision of the seismic code of industrial plants and the seismic intensity scale of China.","PeriodicalId":21974,"journal":{"name":"Stavební obzor - Civil Engineering Journal","volume":"98 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80988103","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
UBLOX F9P FOR GEODETIC MEASUREMENT ubloxf9p用于大地测量
Stavební obzor - Civil Engineering Journal Pub Date : 2022-04-30 DOI: 10.14311/cej.2022.01.0009
D. Zahradník, Zdeněk Vyskočil, Štěpán Hodík
{"title":"UBLOX F9P FOR GEODETIC MEASUREMENT","authors":"D. Zahradník, Zdeněk Vyskočil, Štěpán Hodík","doi":"10.14311/cej.2022.01.0009","DOIUrl":"https://doi.org/10.14311/cej.2022.01.0009","url":null,"abstract":"This article brings knowledge of the settings of the Ublox ZED-F9P device, which will allow to use  this receiver to build-up a simple low-cost GNSS device. The settings for the rover and base station functions are different and need to be done very accurately. Next we present a wiring scheme of the Ublox receiver with the Arduino system which as a whole device will enable the full functionality of the GNSS receiver as it is known from commonly used commercial devices. Ublox receiver was tested on accuracy and solution stability, results are shown in the article.  At our department we create devices usable for teaching students as users or developers.","PeriodicalId":21974,"journal":{"name":"Stavební obzor - Civil Engineering Journal","volume":"134 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89016093","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 ROLE OF TECHNICAL AND NATURAL SCIENCES IN STONE MONUMENTS CARE 技术和自然科学在石碑护理中的作用
Stavební obzor - Civil Engineering Journal Pub Date : 2021-12-31 DOI: 10.14311/cej.2021.04.0070
E. Matoušková, K. Kovářová
{"title":"THE ROLE OF TECHNICAL AND NATURAL SCIENCES IN STONE MONUMENTS CARE","authors":"E. Matoušková, K. Kovářová","doi":"10.14311/cej.2021.04.0070","DOIUrl":"https://doi.org/10.14311/cej.2021.04.0070","url":null,"abstract":"Stone monuments maintenance requires the systematic approach which should be based on the cooperation among specialist through more branches, especially from humanities, natural and technical sciences. The main aim of this article is to present the benefit of the cooperation among geologists and civil engineers and share preliminary results of the Czech Ministry of Culture project DG20P02OVV021 “Stone surface topography and its application in stone element restoration field”. Historic stone surfaces often contain stonemasons tool traces as an undoubtable part of historical monument value. The study and protection of the testimony of past is therefore very important. As a part of our project, we are conducting field and laboratory research of historic stone surfaces bearing the original tool traces. The studied area is the Prague urban conservation zone for its stone monuments richness from Romanesque to present days. First, the geological research of the stone masonry surface is conducted in the cooperation with archaeologists. The tool traces are documented, and the state of stone is described. Because of the negative influence of weathering processes on the stone durability, respectively tool traces, we decided to monitor the chosen historical stone surface using the hyperspectral analysis. Based on the analysis results we will be able to better understand the behaviour of stone surface and traces on it during the time.","PeriodicalId":21974,"journal":{"name":"Stavební obzor - Civil Engineering Journal","volume":"14 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87508947","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
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