The proceedings of the 13th international conference "Modern Building Materials, Structures and Techniques" (MBMST 2019)最新文献

{"title":"Experimental investigation on foamed concrete produced using a planetary ball mill","authors":"E. Namsone, G. Sahmenko, Elvija Namsone, E. Namsone, A. Korjakins, D. Bajare","doi":"10.3846/mbmst.2019.152","DOIUrl":"https://doi.org/10.3846/mbmst.2019.152","url":null,"abstract":"The experimental study is devoted to investigation on foamed concrete produced applying innovative intensive mixing technology by using a planetary ball mill. Modern type of foamed concrete represents cementitious composite material group which may be competitive with traditionally used autoclaved aerated concrete. Innovative mixing method makes possible stabilizing of foamed concrete mixture and improving the microstructure of material. The\u0000aim of this study is to investigate physical and mechanical properties of non-autoclaved concrete such as density and\u0000compressive strength, and capillary water absorption depending on intensive mixing time. In this research microstructure, such as pore size diameters, depending on mixing time is also analysed.","PeriodicalId":169478,"journal":{"name":"The proceedings of the 13th international conference \"Modern Building Materials, Structures and Techniques\" (MBMST 2019)","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115170878","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}

{"title":"Phase trajectories of non-linear oscillations of a tower structure with an attached damper in a uniform wind flow","authors":"V. Volkova, L. Pakrastinsh, L. Gaile","doi":"10.3846/mbmst.2019.056","DOIUrl":"https://doi.org/10.3846/mbmst.2019.056","url":null,"abstract":"This paper is devoted to the study of the dynamic behaviour of a tower structure with an attached damper.\u0000Two dampers are attached to the upper end of the rod in two mutually perpendicular planes. The oscillation damper is\u0000a mass attached to the rod by elastic coupling and a viscous friction. The mathematical model of the object being under consideration includes a system of two non-linear differential equations. The numerical simulation was used to\u0000study the dynamic behavior of a dissipative system with limited excitation, containing a pendulum vibration damper.\u0000The characteristics of the system amplitude − the speed of the wind flow is obtained. It is shown that the pendulum\u0000vibration damper can significantly reduce the amplitudes of resonant oscillations of the cantilever rod. It is also shown\u0000that the choice of system parameters makes it possible to avoid the establishing of resonant oscillations of the system.\u0000at the first resonance zone where the amplitudes of oscillations achieved the greatest values.","PeriodicalId":169478,"journal":{"name":"The proceedings of the 13th international conference \"Modern Building Materials, Structures and Techniques\" (MBMST 2019)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122511624","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}

{"title":"Numerical analysis of vertical stress distribution in the direct shear box devices","authors":"Jurgis Medzvieckas, Š. Skuodis, D. Sližytė","doi":"10.3846/mbmst.2019.104","DOIUrl":"https://doi.org/10.3846/mbmst.2019.104","url":null,"abstract":"When determining the soil strength parameters with direct shear box devices, the values of the parameters are\u0000influenced by devices construction. In assessing this effect, it is necessary to know the magnitude of the vertical stresses\u0000and the nature of the distribution in the shear plane. The soil shear resistance depends on the size of the vertical stresses\u0000and the nature of the distribution in the shear plane. These factors depend on the interaction of the soil with the vertical\u0000walls of the device, i.s. friction between the soil and the walls. At the beginning of the test, the vertical stresses on the\u0000shear plane will be lower than the added pressure at the top of the sample, however the stresses increases due to dilation\u0000during the test. Before the test ends, the stresses in the shear plane will be higher than at the top of the sample. The\u0000article has presented the nature of the vertical stresses distribution on a horizontal plane when using direct shear box\u0000device. The analysis was performed using the PLAXIS 3D software.","PeriodicalId":169478,"journal":{"name":"The proceedings of the 13th international conference \"Modern Building Materials, Structures and Techniques\" (MBMST 2019)","volume":"948 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127593724","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}

{"title":"Structure formation of construction materials modified with natural and man-made nanoadditives","authors":"I. Polyanskikh, G. Yakovlev, G. Pervushin, A. Gumeniuk, A. Gordina, A. Ignateva","doi":"10.3846/mbmst.2019.044","DOIUrl":"https://doi.org/10.3846/mbmst.2019.044","url":null,"abstract":"The article focuses on the study of influence of natural and man-made nanoformations (chrysotile fibers,\u0000carbon black, and graphite) on the formation of the structure of the material based on a hydraulic binder. The data on\u0000the positive effect of the optimal amount of modifying dispersions on the physical and technical properties of the\u0000samples were obtained. On average, the increase in compressive and bending strength, when using the considered\u0000additives, is from 10 to 40%. The results of the study of the microstructure and IR spectra of the check and modified\u0000compositions show that adding natural and man-made nanosystems provides optimal conditions for the formation of\u0000strong, dense new formations in the cement matrix. In general, the data obtained prove the effectiveness of their use in\u0000comparison with synthesized carbon nanosystems.","PeriodicalId":169478,"journal":{"name":"The proceedings of the 13th international conference \"Modern Building Materials, Structures and Techniques\" (MBMST 2019)","volume":"106 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117231438","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}

{"title":"Numerical investigation on dynamic response of a steel lattice tower under various seismic events","authors":"Tomasz Falborsk, N. Lasowicz","doi":"10.3846/mbmst.2019.065","DOIUrl":"https://doi.org/10.3846/mbmst.2019.065","url":null,"abstract":"The present paper presents the results of the numerical study designed to investigate the soil-structure flexibility effects on modal parameters (i.e. fundamental frequencies) and time-history analysis response (represented by the top relative displacements) of a 46.8 m high steel lattice tower subjected to a number of ground motions including also one mining tremor. In addition to the fixed-base condition, three different soil types (i.e. dense soil, stiff soil, and soft soil) were considered in this investigation. Site conditions were characterized by their average effective profile velocities, Poisson’s ratios, and finally mass densities. Soil-foundation flexibility was introduced using the spring-based approach, utilizing foundation springs and dashpots. The first step was to investigate the influence of different base conditions on modal parameters of the steel lattice tower. In the final part of the current study time-history analysis was performed using different two-component ground motion records (in two horizontal, mutually perpendicular directions). The results obtained indicate that modal parameters and dynamic response of the structure may be considerably affected by the soil-structure interaction effects. Therefore, the present paper confirms the necessity of utilizing soil-flexibility into numerical research.","PeriodicalId":169478,"journal":{"name":"The proceedings of the 13th international conference \"Modern Building Materials, Structures and Techniques\" (MBMST 2019)","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116671329","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}

{"title":"Buckling of nanobeams and nanorods with cracks","authors":"H. Arif, J. Lellep","doi":"10.3846/mbmst.2019.038","DOIUrl":"https://doi.org/10.3846/mbmst.2019.038","url":null,"abstract":"Buckling of nanobeams and nanorods is treated with the help of the nonlocal theory of elasticity. The nanobeams under consideration have piecewise constant dimensions of cross sections and are weakened with cracks or cracklike defects emanating at the re-entrant corners of steps. A general method for determination of critical buckling loads\u0000of stepped nanobeams with cracks is developed. The influence of defects on the critical buckling load is evaluated\u0000numerically and compared with similar results of other researchers.","PeriodicalId":169478,"journal":{"name":"The proceedings of the 13th international conference \"Modern Building Materials, Structures and Techniques\" (MBMST 2019)","volume":"146 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115670977","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}

{"title":"Gypsum composition with siltstone-based mineral modifier","authors":"G. Yakovlev, A. Gordina, V. Khritankov, V. Khozin, A. Shaybadullina, D. Khazeev, I. Bazhenova, A. Ivakina, Z. Saidova, A. Repin","doi":"10.3846/mbmst.2019.041","DOIUrl":"https://doi.org/10.3846/mbmst.2019.041","url":null,"abstract":"The paper presents the results of studies of the structure and properties of the gypsum composition comprising 3% of crushed siltstone, a metamorphic rock. The structure and physicochemical properties of siltstone were\u0000studied, which predetermine its usage as a structuring additive in gypsum compositions. Adding crushed siltstone to\u0000the composition of a gypsum binder is shown to cause the compaction of the structure of the gypsum matrix due to\u0000changes in the morphology of crystalline hydrates of calcium sulfate and monolithic structure in general, and, consequently, the enhanced mechanical characteristics of the gypsum composition. Using scanning electron microscopy,\u0000differential thermography, and IR spectral analysis explain the change in the physicomechanical properties of the\u0000gypsum binder.","PeriodicalId":169478,"journal":{"name":"The proceedings of the 13th international conference \"Modern Building Materials, Structures and Techniques\" (MBMST 2019)","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117010467","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}

{"title":"Big data in construction industry: systematic literature overview","authors":"Atis Verdenhofs, I. Geipele, T. Tambovceva","doi":"10.3846/mbmst.2019.062","DOIUrl":"https://doi.org/10.3846/mbmst.2019.062","url":null,"abstract":"Technological advancement has led to tremendous increase of data. Many industries utilize big data to become\u0000more efficient or even to create new products or services. Applications of big data in construction industry has been\u0000extensively researched in Asia that can be explained with huge construction volumes in the area. This study is aimed at\u0000identifying big data applications in construction industry in time period beyond 2016.\u0000Research object is construction industry, research subject is big data applications. Research methods used in this research\u0000are systematic literature overview and meta-analysis. Novelty of the research is classification of big data applications\u0000based on systematic literature overview. Authors conclude that existing categorization (Bilal et al., 2016b) can be applied to researches \u0000about big data applications in construction industry published in 2016 and later. However, potential for new applications is identified \u0000in category of emerging trends triggered by big data and authors propose to perform cross-industry analysis to identify solutions \u0000that can be adopted to construction industry.","PeriodicalId":169478,"journal":{"name":"The proceedings of the 13th international conference \"Modern Building Materials, Structures and Techniques\" (MBMST 2019)","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121368370","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}

{"title":"The numerical analysis of the long-term behaviour of the reinforced concrete beams strengthened with carbon fiber reinforced polymer: Deflection","authors":"M. Daugevičius, J. Valivonis, T. Skuturna","doi":"10.3846/mbmst.2019.009","DOIUrl":"https://doi.org/10.3846/mbmst.2019.009","url":null,"abstract":"The numerical analysis of the reinforced concrete beams strengthened with CFRP is presented. The beams\u0000previously tested experimentally under long-term loading are selected for numerical simulation. The numerical modelling is\u0000performed by evaluating the beam’s work at various stages: the work stage before the long-term loading period, the work\u0000stage under the long-term load action, the work stage when the external load is removed and the work stage until failure. The\u0000work stages of all modelled beams are described in more detail. To analyse the behaviour of beams at different work stages,\u0000the numerical modelling using the phase analysis is performed. Different finite element groups are evaluated in each phase of\u0000analysis. The external load is increased, maintained and reduced. The finite elements of the CFRP layer are activated at a\u0000certain work stage for evaluating the strengthening effect. To assess the accuracy of the numerical analysis, each beam is\u0000modelled from the finite elements of various sizes. The paper presents the process of the numerical modelling and the\u0000predicted deflections. The numerically predicted deflections are compared with the deflections of the experimental study. The\u0000modelling of the behaviour of the strengthened beams has shown that the nature of the long-term deflection differs from that\u0000obtained in the experiment. The increment of the numerically predicted deflection decreases gradually over the long-term\u0000period. Meanwhile, the experimental long-term deflection increment is characterised by the sharp increase and decrease at\u0000the start of the long-term period. This contradiction shows that the experimental long-term deflections are greater. However,\u0000over time, the numerical model deflections may reach and exceed the experimental deflections due to steady increase. The\u0000smaller size of the finite elements causes the increase in the cracking moment and the higher moment when the yielding of\u0000the tensioned reinforcement occurs. However, the cracking moment obtained by the numerical modelling is much higher\u0000than that obtained by the experimental modelling. However, when the yielding strength of the tensile reinforcement is\u0000reached, the considered moment is smaller than the experimental one.","PeriodicalId":169478,"journal":{"name":"The proceedings of the 13th international conference \"Modern Building Materials, Structures and Techniques\" (MBMST 2019)","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120833803","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}

{"title":"Safety and quality assurance for geotechnical constructions in urban areas","authors":"S. Leppla, R. Katzenbach","doi":"10.3846/mbmst.2019.008","DOIUrl":"https://doi.org/10.3846/mbmst.2019.008","url":null,"abstract":"Safety and quality assurance are the most important aspects for the design and the construction of geotechnical\u0000structures. These aspects consider the optimisation by reducing the resources material, money and time. For construction\u0000projects with a distinctive soil-structure interaction in the vicinity of existing structures special methods have to be\u0000applied to guarantee safety and quality. Therefor numerical simulations using the Finite-Element-Method (FEM), in-situ\u0000load tests on the construction site, special foundation techniques like the Combined Pile-Raft Foundation (CPRF),\u0000the observational method and an independent peer review are necessary. The paper explains the application and the\u0000combination of these tools by examples from engineering practice.","PeriodicalId":169478,"journal":{"name":"The proceedings of the 13th international conference \"Modern Building Materials, Structures and Techniques\" (MBMST 2019)","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123913979","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}