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Slovak Journal of Civil Engineering最新文献

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Feasibility of Using Energy Performance Contracting for the Retrofit of Apartment Buildings in Slovakia 斯洛伐克公寓楼改造采用能源履约合同的可行性
IF 0.4
Slovak Journal of Civil Engineering Pub Date : 2022-09-01 DOI: 10.2478/sjce-2022-0019
Veronika Gombošová, M. Krajčík, O. Šikula
{"title":"Feasibility of Using Energy Performance Contracting for the Retrofit of Apartment Buildings in Slovakia","authors":"Veronika Gombošová, M. Krajčík, O. Šikula","doi":"10.2478/sjce-2022-0019","DOIUrl":"https://doi.org/10.2478/sjce-2022-0019","url":null,"abstract":"Abstract This study is focused on the feasibility of using energy performance contracting (EPC) for the retrofit of two apartment buildings constructed using precast concrete technologies in Slovakia decades ago. The retrofit packages were defined, and their suitability for EPC was evaluated through discounted payback. The uncertainties in the profitability calculations were covered by designing five possible economic developments and defining input ranges instead of just single inputs. The measures in the technical systems were shown to be more feasible than the retrofit of the building envelopes. The potential to finance the selected measures for technical systems through EPC was further evaluated. It was shown that, for at least one of the two buildings studied, the EPC was recommended only for the economic developments with a notable increase in energy prices compared to the baseline that referred to the situation before the Covid-19 pandemic. In the best case, the payback was four years for one building and seven years for the other; thus, both were potentially suitable for EPC. However, for a complex retrofit, the EPC must be combined with a different funding source to also finance other retrofit measures.","PeriodicalId":43574,"journal":{"name":"Slovak Journal of Civil Engineering","volume":"30 1","pages":"33 - 42"},"PeriodicalIF":0.4,"publicationDate":"2022-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45173032","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
Workability and Strength Characteristics of Alkali-Activated Fly ASH/GGBS Concrete Activated with Neutral Grade Na2SiO3 for Various Binder Contents and the Ratio of the Liquid/Binder 中性级Na2SiO3活化碱活化粉煤灰/GGBS混凝土在不同粘结剂掺量和液胶比下的和易性和强度特性
IF 0.4
Slovak Journal of Civil Engineering Pub Date : 2022-09-01 DOI: 10.2478/sjce-2022-0021
Gugulothu Vikas Paul, T. D. Gunneswara Rao
{"title":"Workability and Strength Characteristics of Alkali-Activated Fly ASH/GGBS Concrete Activated with Neutral Grade Na2SiO3 for Various Binder Contents and the Ratio of the Liquid/Binder","authors":"Gugulothu Vikas Paul, T. D. Gunneswara Rao","doi":"10.2478/sjce-2022-0021","DOIUrl":"https://doi.org/10.2478/sjce-2022-0021","url":null,"abstract":"Abstract Alkali-activated fly ash/GGBS concrete (AAFGC) is a new blended concrete that has been studied by many researchers due to its environmental advantages and better technological characteristics. However, the effect of various factors on AAFGC fresh and hardened properties has not yet been thoroughly studied. The literature mainly describes the combination of NaOH and Na2SiO3 as an activator for the AAFGC’s activation, but alkali-activated GGBS concrete (AAGC) prepared with this activator solution is less workable due to its rapid setting behaviour. In this study, AAFGC was prepared using neutral grade liquid Na2SiO3 with a SiO2/Na2O ratio of 2.92. An experimental program was performed for fly ash-GGBS combinations (100-0, 50-50, 0-100), solution/binder ratios (0.6, 0.65, 0.7) and binder contents (300, 400 and 500 kg/m3) to evaluate the workability and the compressive and tensile strength of AAFGC. The results of this study show that a water glass of 2.92 silica modulus used as an activator to prepare AAFGC under ambient curing is very useful in the construction industry.","PeriodicalId":43574,"journal":{"name":"Slovak Journal of Civil Engineering","volume":"30 1","pages":"53 - 64"},"PeriodicalIF":0.4,"publicationDate":"2022-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41852706","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
Possibilities of Applying Multivariable Regression in Groundwater Data Series along a Riverbank Area 多变量回归在河岸地区地下水资料序列中的应用可能性
IF 0.4
Slovak Journal of Civil Engineering Pub Date : 2022-06-01 DOI: 10.2478/sjce-2022-0012
Flora Wagner
{"title":"Possibilities of Applying Multivariable Regression in Groundwater Data Series along a Riverbank Area","authors":"Flora Wagner","doi":"10.2478/sjce-2022-0012","DOIUrl":"https://doi.org/10.2478/sjce-2022-0012","url":null,"abstract":"Abstract Groundwater modelling needs a large number of piezometer well data, which is unfortunately not always available as earlier registered data series are not always continuous. The reconstruction of data series with gaps was previously examined on a small riverside pilot area with the help of multiple regression, this method has now been tested at a 50-times larger environment. The results show that the reconstruction of the data series with this method works with average monthly groundwater levels and that applying multiple regression with the independent variables being one of the wells and the river optimizes the accuracy of the calculated data series, even if the relationships between the river and the wells are weak. The effect of the multiple regression on the accuracy is greater if the data series is sparser.","PeriodicalId":43574,"journal":{"name":"Slovak Journal of Civil Engineering","volume":"30 1","pages":"30 - 37"},"PeriodicalIF":0.4,"publicationDate":"2022-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45121668","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
Lidar-Based Mobile Mapping System for an Indoor Environment 基于激光雷达的室内环境移动测绘系统
IF 0.4
Slovak Journal of Civil Engineering Pub Date : 2022-06-01 DOI: 10.2478/sjce-2022-0014
J. Brindza, P. Kajánek, J. Erdélyi
{"title":"Lidar-Based Mobile Mapping System for an Indoor Environment","authors":"J. Brindza, P. Kajánek, J. Erdélyi","doi":"10.2478/sjce-2022-0014","DOIUrl":"https://doi.org/10.2478/sjce-2022-0014","url":null,"abstract":"Abstract The article deals with developing and testing a low-cost measuring system for simultaneous localisation and mapping (SLAM) in an indoor environment. The measuring system consists of three orthogonally-placed 2D lidars, a robotic platform with two wheel speed sensors, and an inertial measuring unit (IMU). The paper describes the data processing model used for both the estimation of the trajectory of SLAM and the creation of a 3D model of the environment based on the estimated trajectory of the SLAM. The main problem of SLAM usage is the accumulation of errors caused by the imperfect transformation of two scans into each other. The data processing developed includes an automatic evaluation and correction of the slope of the lidar. Furthermore, during the calculation of the trajectory, a repeatedly traversed area is identified (loop closure), which enables the optimisation of the trajectory determined. The system was tested in the indoor environment of the Faculty of Civil Engineering of the Slovak University of Technology in Bratislava.","PeriodicalId":43574,"journal":{"name":"Slovak Journal of Civil Engineering","volume":"30 1","pages":"47 - 58"},"PeriodicalIF":0.4,"publicationDate":"2022-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42056258","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
Wave Run-Ups and Overtopping Affected by Oblique Wave Approaches and Currents 受斜波接近和水流影响的浪涌和过顶
IF 0.4
Slovak Journal of Civil Engineering Pub Date : 2022-06-01 DOI: 10.2478/sjce-2022-0010
M. Špano, A. Bornschein, R. Pohl, J. Říha, H. Schüttrumpf
{"title":"Wave Run-Ups and Overtopping Affected by Oblique Wave Approaches and Currents","authors":"M. Špano, A. Bornschein, R. Pohl, J. Říha, H. Schüttrumpf","doi":"10.2478/sjce-2022-0010","DOIUrl":"https://doi.org/10.2478/sjce-2022-0010","url":null,"abstract":"Abstract To quantify the effect of a current on the height of a wave’s run-up and overtopping combined with an oblique wave approach, the “FlowDike” hydraulic research project was carried out. Tests were performed on two dike slopes of 1:3 and 1:6. Waves were generated across (perpendicular to) the physical model and also inclined in-plane to the stream axis. Oblique waves were generated both towards and along the flow’s direction. The effect of the current and of the wave direction on the height of the wave run-up and amount of the wave overtopping was expressed by means of a combined correction factor for the wave’s inclination and flow velocity. The results of the research confirmed that the flow velocity had only a small effect.","PeriodicalId":43574,"journal":{"name":"Slovak Journal of Civil Engineering","volume":"30 1","pages":"12 - 21"},"PeriodicalIF":0.4,"publicationDate":"2022-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44529809","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 Comparison of Variational Projection and Cartographic Projection by Ritz’s Method 里兹法变分投影与地图投影的比较
IF 0.4
Slovak Journal of Civil Engineering Pub Date : 2022-06-01 DOI: 10.2478/sjce-2022-0011
Andrea Ábrahámová, Margita Vajsablova
{"title":"A Comparison of Variational Projection and Cartographic Projection by Ritz’s Method","authors":"Andrea Ábrahámová, Margita Vajsablova","doi":"10.2478/sjce-2022-0011","DOIUrl":"https://doi.org/10.2478/sjce-2022-0011","url":null,"abstract":"Abstract The application of alternative mathematical methods in creating cartographic projections is an interesting factor, which affects the optimization of distortions and their distribution in the projected territory. This article presents the methodology for the creation and comparison of conformal cartographic projections formed by alternative mathematical methods of minimizing the integral criterion for scale distortion in Slovakia. The creation of the variational projection is based on the Airy-Kavraiskii criterion of evaluating the projection on the displayed area by solving Laplace's equation. The second projection is created by solving Poisson's equation using Ritz's method. Our analysis showed that the variational projection of Slovakia achieves more satisfactory distortion values than the cartographic projection created using Ritz's method. The advantage of Ritz's method is that it is possible to choose a boundary condition for a predefined undistorted convex closed curve. In this paper, we have also derived specific members of the map equations for cartographic projection based on solving Poisson's equation by Ritz's method.","PeriodicalId":43574,"journal":{"name":"Slovak Journal of Civil Engineering","volume":"30 1","pages":"22 - 29"},"PeriodicalIF":0.4,"publicationDate":"2022-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47704690","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
Investigation of the Liquefaction Potential of Coal Ash Due to Seismic Loading 粉煤灰在地震荷载作用下的液化潜力研究
IF 0.4
Slovak Journal of Civil Engineering Pub Date : 2022-06-01 DOI: 10.2478/sjce-2022-0013
I. Slávik
{"title":"Investigation of the Liquefaction Potential of Coal Ash Due to Seismic Loading","authors":"I. Slávik","doi":"10.2478/sjce-2022-0013","DOIUrl":"https://doi.org/10.2478/sjce-2022-0013","url":null,"abstract":"Abstract Coal ash is a geomaterial with a metastable structure. This type of geomaterial is significantly susceptible to liquefaction as a result of seismic loads. An investigation of ash that is susceptible to liquefaction due to a seismic load can use the CPT penetration test. This method of investigating liquefaction was developed based on numerous penetration tests of sandy or silty–sandy soils and was developed at the Workshop on the Evaluation of Soil Liquefaction Resistance, NCEER, Salk Lake City, Utah, USA, 1996. In the present article, the results of the CPT penetration test conducted at the Rosina ash tailings pond in Žilina in Slovakia, are analyzed using the NCEER methodology. The safety factor for ash liquefaction was expressed based on the penetration resistance values measured in the CPT tests using the ‘LiquefyPro’ software. The safety factor in the liquefaction of the ash sediment was expressed by changing the level of seeping water in the body of the tailings pond, the unit weight of coal ash, and the seismic acceleration.","PeriodicalId":43574,"journal":{"name":"Slovak Journal of Civil Engineering","volume":"30 1","pages":"38 - 46"},"PeriodicalIF":0.4,"publicationDate":"2022-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48872628","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
Smart-Readiness Assessment of a Complex Residential Building in Ukraine 乌克兰一座复杂住宅建筑的智能准备评估
IF 0.4
Slovak Journal of Civil Engineering Pub Date : 2022-06-01 DOI: 10.2478/sjce-2022-0009
Olexandr Adegov, S. Shekhorkina, M. Babenko, Maryna Lyahovetska-Tokareva, Olexandr Kudryavcev
{"title":"Smart-Readiness Assessment of a Complex Residential Building in Ukraine","authors":"Olexandr Adegov, S. Shekhorkina, M. Babenko, Maryna Lyahovetska-Tokareva, Olexandr Kudryavcev","doi":"10.2478/sjce-2022-0009","DOIUrl":"https://doi.org/10.2478/sjce-2022-0009","url":null,"abstract":"Abstract Smart building concepts are a relevant topic for the Ukrainian building sector. Although the current policy is mostly dedicated to the improvement of the current energy-saving situation in the building stock, the concept discussed could provide valuable inputs in the realization of the existing strategy. For an assessment of the expected positive impact of the implementation of smart indicators on building operation and renovation processes, as well as the predictions of scenarios of the range of the application of smart instruments, the research presented proposes a thorough analysis of the building stock in Ukraine and, in a real pilot case, the assessment of smart-readiness indicators (SRI) for a complex multi-family building. The case scenarios used, which are derived on the basis of SRI and a processed questionnaire among the habitants, are considered as the reference foundation for a practical application and disseminating the concept for similar cases.","PeriodicalId":43574,"journal":{"name":"Slovak Journal of Civil Engineering","volume":"30 1","pages":"1 - 11"},"PeriodicalIF":0.4,"publicationDate":"2022-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48183946","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
Impact of Changes in Short-Term Rainfall on Design Floods: Case Study of the Hnilec River Basin, Slovakia 短期降雨变化对设计洪水的影响——以斯洛伐克Hnilec河流域为例
IF 0.4
Slovak Journal of Civil Engineering Pub Date : 2022-03-01 DOI: 10.2478/sjce-2022-0008
Gabriel Földes, M. Labat, S. Kohnová, K. Hlavčová
{"title":"Impact of Changes in Short-Term Rainfall on Design Floods: Case Study of the Hnilec River Basin, Slovakia","authors":"Gabriel Földes, M. Labat, S. Kohnová, K. Hlavčová","doi":"10.2478/sjce-2022-0008","DOIUrl":"https://doi.org/10.2478/sjce-2022-0008","url":null,"abstract":"Abstract The research aims to analyze changes in the predicted short-term rainfall intensities at the Telgárt climatological station and the subsequent use of these predicted rainfall intensities for estimating design floods. The area of interest selected is the upper Hnilec River basin in Slovakia. The research is divided into two parts: In the first part, the authors have focused on analyzing future seasonal changes and the trend of shortterm rainfall intensities and estimating the scaling exponents of short-term rainfall. In the second part, the observed and predicted short-term rainfall intensities have been applied to estimate the design floods in the study area, using the Soil Conservation Service – Curve Number method (SCS CN). The results indicate that for the future periods, there will be a shift in the rainfall maxima of about one week to an earlier period in July compared to the historical period. The changes in the short-term rainfall trends were detected in the 60-, 120- and 180-minute rainfall durations at the 90% significance level. The results of the design discharges predict higher values in the near future in the case of the 10- and 20-year return periods and higher values in the 50- and 100-year return periods for the remote future.","PeriodicalId":43574,"journal":{"name":"Slovak Journal of Civil Engineering","volume":"30 1","pages":"68 - 74"},"PeriodicalIF":0.4,"publicationDate":"2022-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43806606","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
Theoretical Correlations Between the Cumulative Absolute Velocity and Performance Point for a Seismic Analysis of Framed Structures 框架结构地震分析中累积绝对速度与性能点的理论关联
IF 0.4
Slovak Journal of Civil Engineering Pub Date : 2022-03-01 DOI: 10.2478/sjce-2022-0003
Kahil Amar, Hannachi Naceur Eddine, H. Mohand, M. Ahmed
{"title":"Theoretical Correlations Between the Cumulative Absolute Velocity and Performance Point for a Seismic Analysis of Framed Structures","authors":"Kahil Amar, Hannachi Naceur Eddine, H. Mohand, M. Ahmed","doi":"10.2478/sjce-2022-0003","DOIUrl":"https://doi.org/10.2478/sjce-2022-0003","url":null,"abstract":"Abstract The present paper investigates the effect of the harmfulness of a potential earthquake on structural and seismic risks. It takes into account the magnitude, epicentral distance, and pseudo depth at the hypocenter as well as the soil classification in order to generate synthetic seismic motions to be considered as signal inputs for a structural seismic analysis. The most typical typology of dwellings and buildings that are widely existing in Algeria, i.e., a reinforced concrete frame structure, is considered for the case study. The results show that the theoretical models developed in this study are able to predict the performance point (spectral displacement) according to the cumulative absolute velocity. They also show that(CAV-Sd) (Sd being the spectral displacement of the performance point defined by a pushover analysis) is slightly influenced by the value of the ultimate displacements of the structures and the soil parameters (shear velocity Vs).","PeriodicalId":43574,"journal":{"name":"Slovak Journal of Civil Engineering","volume":"30 1","pages":"21 - 32"},"PeriodicalIF":0.4,"publicationDate":"2022-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44193986","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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