Slovak Journal of Civil Engineering最新文献_第3页

Hydraulic Calculations of a Telescopic Water Intake 伸缩式取水口的水力计算

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Slovak Journal of Civil Engineering Pub Date : 2023-06-01 DOI: 10.2478/sjce-2023-0013

A. Lipin, A. Sepahvand, N. Rustamova

{"title":"Hydraulic Calculations of a Telescopic Water Intake","authors":"A. Lipin, A. Sepahvand, N. Rustamova","doi":"10.2478/sjce-2023-0013","DOIUrl":"https://doi.org/10.2478/sjce-2023-0013","url":null,"abstract":"Abstract Telescopic water intake structures allow for the selective intake of water from the top layers of a reservoir. A telescopic water intake has a high degree of mobility, and a wide field of application; at the same time, it is very simple and convenient to operate. Despite these advantages, an exact calculation method for a telescopic water intake is lacking (Lipin, 2020; Lipin, 2022). Therefore, the purpose of this research is to develop an exact calculation method for a telescopic water intake. In order to perform this task, all the structural elements of a telescopic water intake were analyzed separately by means of existing hydraulic principles. The impact of the critical submergence depth of the water intake funnel on the operability of a telescopic water intake was studied, and an equation for the critical submergence depth calculation was proposed. The optimal range of the flow rate coefficient ( μ =0.30 - 0.45) was proposed for calculating the funnel flow rate, and the correlation between the flow rate and funnel inlet diameter was defined. The optimal curvature radius of the elbow was proposed. In order to verify the above mentioned parameters and correlations, analytical and numerical calculations of specific examples were performed. The results of the numerical modelling demonstrated that the critical submergence depth and shape of the water intake funnel, as defined by the analytical calculations, ensured its effective operation free of cavitation and vortexes. The analytically calculated dimensions of the telescopic column, following the numerical modelling results, provided normal hydraulic conditions without active cavitation. According to the numerical modelling, the proposed curvature radius of the elbow was sufficient to avoid significant cavitation and vortex formation in the elbow structure. This research can provide guidance for the design of telescopic water intake structures.","PeriodicalId":43574,"journal":{"name":"Slovak Journal of Civil Engineering","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41474310","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

Verification of the Ramberg-Osgood Material Model for the Fire Design of Steel Members 钢构件防火设计中Ramberg-Osgood材料模型的验证

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Slovak Journal of Civil Engineering Pub Date : 2023-06-01 DOI: 10.2478/sjce-2023-0008

Samer Nemer

{"title":"Verification of the Ramberg-Osgood Material Model for the Fire Design of Steel Members","authors":"Samer Nemer","doi":"10.2478/sjce-2023-0008","DOIUrl":"https://doi.org/10.2478/sjce-2023-0008","url":null,"abstract":"Abstract In this paper, the modified Ramberg-Osgood constitutive equations for calculating the stress-strain of steel at elevated temperatures using the parameters determined based on the transient state tensile test results achieved at the Helsinki University of Technology are verified. This is done by numerically comparing the global and local buckling capacities of I-shaped steel members incorporating the modified Ramberg-Osgood model along with the material model given in the fire section of Eurocode EN1993-1-2. For this purpose, a numerical model using the ABAQUS software was developed. Then, nonlinear analyses with imperfections (GMNIA) were performed to compare the buckling capacities of the steel columns and beams of four different hot-rolled cross-sections (IPE160, IPE180, HE100B, HE500B), made of steel grade S355, at three different temperatures (400°C, 500°C, 600°C). The results showed that adopting the modified Ramberg-Osgood model can lead to the same buckling capacities resulting when using the EN1993-1-2 material model for steel temperatures of less than 400°C. However, adopting this model for 600°C overestimates the buckling capacities in most cases.","PeriodicalId":43574,"journal":{"name":"Slovak Journal of Civil Engineering","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43377069","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

Analysis of Indoor Air Quality in a Kindergarten 某幼儿园室内空气质量分析

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Slovak Journal of Civil Engineering Pub Date : 2023-06-01 DOI: 10.2478/sjce-2023-0007

Petra Stiborova, Andrea Badurova, I. Skotnicova

引用次数: 0

Comparative Study of the Lightening of Concrete Through the Use of Recycled Tire Rubber and Expanded Clay Aggregate 再生轮胎橡胶与膨胀粘土骨料对混凝土轻量化的比较研究

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Slovak Journal of Civil Engineering Pub Date : 2023-06-01 DOI: 10.2478/sjce-2023-0009

R. Djebien, Rachid Kebout, Amel Bouabaz

{"title":"Comparative Study of the Lightening of Concrete Through the Use of Recycled Tire Rubber and Expanded Clay Aggregate","authors":"R. Djebien, Rachid Kebout, Amel Bouabaz","doi":"10.2478/sjce-2023-0009","DOIUrl":"https://doi.org/10.2478/sjce-2023-0009","url":null,"abstract":"Abstract The waste of tire rubber is characterized by the generation of huge amounts, which is annually discarded. This waste causes problems for human health and the environment. Thus, the valorization of recycled tire rubber in concrete production is considered as an alternative and sustainable solution. This experimental work is a comparative study, which aims to investigate the possibility of using recycled tire rubber as a fine aggregate in the production of lightweight concrete. To achieve this objective, two types of lightweight concrete containing (35, 70 and 100%) of expanded clay and (5, 10 and 15%) of recycled tire rubber as a fine aggregate were produced. Their fresh properties were investigated using slump, density and air content tests, while the hardened properties were investigated by compressive strength, flexural strength, ultrasonic pulse velocity, and water absorption tests. The results obtained showed that the utilization of both expanded clay aggregate and recycled tire rubber leads to a reduction in density and mechanical strength but increases the porosity of lightweight concrete. However, the lightweight concrete containing the expanded clay aggregate had a higher efficiency factor than those containing recycled tire rubber.","PeriodicalId":43574,"journal":{"name":"Slovak Journal of Civil Engineering","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41584603","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

A Study of the Sedimentation and Storage Capacity Depletion of a Reservoir 水库淤积与库容损失研究

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Slovak Journal of Civil Engineering Pub Date : 2023-06-01 DOI: 10.2478/sjce-2023-0011

Y. Zerihun

{"title":"A Study of the Sedimentation and Storage Capacity Depletion of a Reservoir","authors":"Y. Zerihun","doi":"10.2478/sjce-2023-0011","DOIUrl":"https://doi.org/10.2478/sjce-2023-0011","url":null,"abstract":"Abstract Theoretical and empirical equations have previously been proposed to compute the sediment trap efficiency of a reservoir. The empirical equations were developed by analyzing a limited amount of field data for reservoirs in selected areas; thus, their suitability is restricted to reservoirs in regions with similar hydrological characteristics. In this study, a sediment trap-efficiency equation, which accounts for the dynamic behavior of sedimentation and the hydraulic conditions of a reservoir, was deduced from the principle of mass conservation. Using this equation, the approximate analytical expression for the storage capacity of the reservoir was obtained. Both equations were applied to investigate real-life problems involving the impacts of reservoir sedimentation, and their predicted solutions were compared with the field data and the results of the theoretical and empirical equations. The results of this investigation reveal that the proposed equations are capable of simulating the sediment trapping and storage capacity depletion characteristics of large reservoirs, which are a measure of the adverse effect of sedimentation on the performance of hydraulic structures. These equations can potentially be incorporated into a large-scale watershed model for estimating a sediment budget.","PeriodicalId":43574,"journal":{"name":"Slovak Journal of Civil Engineering","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45958135","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

Evaluation of a Measurement Turbulence Model of the Wind Pressure on the Ruin of a Fortified Tower 加固塔废墟风压测量湍流模型的评价

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Slovak Journal of Civil Engineering Pub Date : 2023-06-01 DOI: 10.2478/sjce-2023-0010

Martin Poliak, M. Franek, Jana Gregorová

引用次数: 0

Experimental Investigation of the Performance of Buried Flexible Pipe in Reinforced Sand 加筋砂土中埋地柔性管性能的试验研究

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Slovak Journal of Civil Engineering Pub Date : 2023-06-01 DOI: 10.2478/sjce-2023-0012

M. Fattah, Bushra S. Zbar, H. H. Al-Kalali

{"title":"Experimental Investigation of the Performance of Buried Flexible Pipe in Reinforced Sand","authors":"M. Fattah, Bushra S. Zbar, H. H. Al-Kalali","doi":"10.2478/sjce-2023-0012","DOIUrl":"https://doi.org/10.2478/sjce-2023-0012","url":null,"abstract":"Abstract The experimental work of this study deals with the performance of pipe in sand with various responses subjected to incremental static loading where the backfill is reinforced with two types of reinforcement (geogrid and geocell) to investigate the effects of backfill cover. The pipes considered are installed in sand with different densities; i.e., loose, medium and dense sand, and a constant burial depth (2D, where D is the pipe diameter). It was concluded that the maximum deformation occurs at the crown of the pipe. The deformation increases when the sand density decreases. For a burial depth equal to 1.5 D, the maximum strain on the pipe crown increases by about 22.5% when the sand changes from dense to medium and 36.8% when it changes from dense to loose. The vertical stress above a pipe buried in loose sand is reduced by 8.3% when the geogrid width is 2B where B is the footing width, while it is equal to 22% when the geogrid width is B. When a geocell is used, the percent reduction is equal to 62%. The percent reduction in the vertical stress above a pipe buried in medium sand is about 28% when the geogrid width is 2B and 40% when the geogrid width is B and equal to 68% when the geocell is used.","PeriodicalId":43574,"journal":{"name":"Slovak Journal of Civil Engineering","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46116719","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

Effects of Coarse Aggregate Rap Content on the Mechanical and Shear Performance of HMA by the UPT Method 用UPT法研究粗集料Rap含量对HMA力学和剪切性能的影响

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Slovak Journal of Civil Engineering Pub Date : 2023-06-01 DOI: 10.2478/sjce-2023-0014

M. Khabiri, Meysam Saboohi

{"title":"Effects of Coarse Aggregate Rap Content on the Mechanical and Shear Performance of HMA by the UPT Method","authors":"M. Khabiri, Meysam Saboohi","doi":"10.2478/sjce-2023-0014","DOIUrl":"https://doi.org/10.2478/sjce-2023-0014","url":null,"abstract":"Abstract In recent years, the use of materials derived from recycled asphalt has attracted the attention of airfield and highway construction researchers. Since the making of these products is economically cost-effective, one idea about how to use them is to use coarse-grained crumbs from recycled Asphalt Pavement (RAP), which are agglomerates that can be found in coarse RAP, as a replacement for virgin asphalt.The goal of the current study is to investigate the performance of hot mix asphalt created with various percents of RAP. The punching shear strength of cylindrical specimens versus the penetration of steel rods with fixed and determined diameters into an asphalt specimen is one of the tests used to study the shear strength of asphalt. Other typical tests include a test of the structural strength and resilient modulus with two rectangular and sinusoidal loading shapes, respectively, as well as the specimen's strength against different temperatures of asphalt mixtures containing 10, 20, and 30% coarse-grained RAP. The results show that the resilient strength of the samples with a maximum 30% coarse-grained RAP is within reasonable limits. Furthermore, the semi-sinusoidal loading has a higher resilience modulus than rectangular loading. It is also observed during uniaxial penetration testing (UPT) that increasing the RAP increases the penetration of the steel rod, thereby implying that the shear strength of the asphalt has decreased.","PeriodicalId":43574,"journal":{"name":"Slovak Journal of Civil Engineering","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48650117","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

A New Perspective on Residential Building Ventilation from the Point of View of Achieving the Desired Indoor Air Quality using Different Ventilation Systems 从不同通风系统实现理想室内空气质量的角度看住宅建筑通风的新视角

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Slovak Journal of Civil Engineering Pub Date : 2023-03-01 DOI: 10.2478/sjce-2023-0005

Zuzana Straková, Ju. A. Markova

引用次数: 0

A Comparison of Cadastre in Slovakia and Poland 斯洛伐克和波兰地籍制度比较

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Slovak Journal of Civil Engineering Pub Date : 2023-03-01 DOI: 10.2478/sjce-2023-0001

Magdalena Jurkiewicz, Ľ. Hudecová, Peter Kyseľ, P. Klapa, M. Mika, M. Ślusarski

引用次数: 1