Statement of the problem. It is important to consider the characteristics of the soil base when calculating models of multi-story frame buildings and determining the forces and deformations in their elements. The influence of the foundation is manifested in the redistribution of forces in load-bearing structures and significantly affects the numerical results of the calculation [1]. Today, the requirements for the level of safety of residential buildings have increased, which requires a more complete consideration of the factors that affect the safety of structures. Thus, this study is very relevant. The paper analyzes three variants of models of interaction between a multi-storey frame building and a soil foundation. A modal analysis was performed to evaluate the influence of the soil foundation on the frequencies and eigenvalues of free vibrations of the building. The modeling was performed using the finite element method and implemented in the SCAD software package. The aim of the study is to assess the influence of the soil foundation on the stress-strain state of a multi-story frame building and the eigenvalues and frequencies of its natural vibration forms.

The most part of radioactive wastes in Lithuania has been produced by Ignalina nuclear power plant (INPP). Geological studies for the analysis of Lithuanian geological setting suitability to host the deep geological repository (DGR) had been started at the end of last century. The geological investigations are comprehensive, time consuming and need a high qualification of the experts involved. Potentially suitable geological formations had been selected according to the criteria used in the best international practice. The potentially suitable formations for the DGR construction in Lithuania are the rocks of crystalline basement, lower Cambrian clay, upper Permian anhydrite and lower Triassic clay. A special program has been developed in Lithuania for the purpose of implementing the European Council Directive 2011/70/Euratom of 19 July 2011, establishing the Community framework for the responsible and safe management of spent nuclear fuel and radioactive waste. According to the program the responsibility for DGR project was delivered to INPP in 2019. The geological investigations take a big part of the program and several tasks have been solved already. Sites for the further investigations were identified in 2020, criteria for site exclusion were determined in 2021 and potentially suitable sites were ranked according to the suitability criteria in 2022. However, there are only several results of geological formations material investigations. The lack of such investigations is caused by insufficient financial resources. The material of geological strata should be tested in the natural conditions and new deep boreholes are needed for this purpose.

The current discussion related to energy demandness, sometimes generally referred to by the abbreviation Green Deal, basically comes from two directions – reducing energy in absolute values, or when it is necessary to use renewable energy sources to a greater extent and thus reduce the consumption of fossil fuels. Construction is generally associated with high energy consumption, which is most often reported in the range of 30–40% of total consumption. However, current attention is mainly focused on buildings under the designation Energy Efficient Buildings - EEB. The contribution is therefore focused on the area of civil engineering structures, which still remains in the background of attention and is devoted to both the reduction of total energy consumption and the possibilities of using renewable energy sources. However, the main difference in possible energy savings compared to buildings can be determined in the different stages of preparation, construction, and structures phase of utilization. In the case of EEB, it is mainly about the reduction of consumption during the phase of the building utilization, in the case of civil engineering structures, it is mainly about the first phases. The basic possibilities of achieving these goals are therefore the main focus of the contribution, when the possibilities are primarily directed to the geotechnical constructions of transport structures.

The use of geosynthetics has gained increasing attention in recent years due to their potential benefits in various engineering applications. Geosynthetics are used to improve soil structures such as base courses or retaining walls, mostly through reinforcement, filtration, separation, and sealing functions. This paper examines the environmental and economic benefits of using geosynthetics in road, earthworks, and foundation engineering. The paper discusses soil reinforcement of base courses, construction of retaining walls, and sealing layers. One of the main environmental benefits of using geosynthetics is the reduction in the use of natural or manufactured resources such as concrete. Traditional construction methods often require excavation and transportation of large quantities of soil, rock, and other materials. By contrast, geosynthetics can be used to enhance the properties of existing soils, minimizing the need for additional materials. This significantly reduces the carbon footprint and improves the sustainability of construction projects. Case studies are presented to illustrate the benefits of geosynthetics in practice. The paper concludes that geosynthetics can provide significant environmental and economic benefits in construction and should be widely considered in construction projects.

Everyday experience tell us and confirms that professional human activities may be endangered a lot with occupational risks. This is why occupational safety (OS) assessment measures are applied to identify real threads and possible measures to prepare to face them and provide necessary OS level for workers and work environments in general. The reliable assessment of actual safety level depends on adequate occupational risk evaluation. There are a lot of risk assessment tools available. Each of them has advantages and disadvantages. Thus, there is no ideal tool, even in the case of a concrete work case. OS problems and use to be multidimensional and complex. This is why they are usually dealt with in two possible ways. The first one pertains to the application of complex, not so easy to comprehend, rather dedicated approaches while the second one pertains to the application of approaches that are easy to use but that also seem to be too simple and thus too inadequate. On the other hand, occupational safety assessment is susceptible to be supported by dedicated non-flexible tools which may make general occupational safety assessment methodology incoherent and fragmented. This is why the application of a specific methodology of occupational safety assessment is suggested in the paper. The methodology is based on the application of a universal multidimensional decision making support tools. It is easy to comprehend, it facilitates making occupational safety assessment more coherent between diverse areas and it allows effective coping with both complex and easier safety assessment problems while covering intangibility of available information.

In construction practice, all decisions are made in the context of imperfect information. The awareness of this means that efforts are made already during the preparation of decisions to limit the degree of risk and uncertainty resulting from such a nature of the available information. A risk assessment may prove particularly useful for this purpose. It can be carried out in a number of available ways. Such methods are usually based on the use of a specific methodology, expressing the complexity of the subject of the decision with the help of a specific – not sharp – representation of the available information and therefore requiring the use of advanced tools for its appropriate processing. However, it seems that there are also tools that provide appropriate, and at the same time much simpler, methods of risk assessment. Such tools undoubtedly include pairwise comparisons, in particular – the standard AHP/ANP method, using sharp data representation. In the context of risk assessment, a specific feature of this method is considered, consisting in the availability of various sharp rating scales. Their suitability for expressing different attitudes towards risk was assessed. Ultimately, it turned out that the conscious use of such scales enables the proper fulfillment of the needs related to risk assessment.

Unmanned Aerial Vehicles (UASs), also referred to as unpiloted aerial drones or vehicles, has currently attracted high attention in the architecture, engineering, and operations due to it great maneuverability. The aim of this study is to evaluate the use of Unmanned Arial System (Drone) on Risk/Accidents Involved in Construction Project Monitoring in Enugu State, Nigeria and also the potentials of applying UASs in capturing multi-sensory data in construction project. Estimate, 60.000 fatal accidents occur annually worldwide in the construction industry and one worker loss his life every 10 min because of an occupational accident. Construction accidents are associated with different factors which has been studied by many scholars which formed the basis for data generated for this study. The target population in the study composes of of the Architects, Quantity Surveyors, Project Managers, Land Surveyors, Civil and Structural Engineers, Mechanical and Electrical Engineers and Builders in Enugu State, Nigeria as they are the primary participants who have substantial involvement and responsibilities in Project Monitoring. The study shows that drone technology if employment for construction project monitoring will reduce site accidents such as; accident on transit, falling debris, natural disaster, falls from high heights or scaffolding, exposure to dangerous chemicals or toxins and harmful materials on site.

Aerated autoclaved concrete (AAC) is a building material consisting of lime, cement, siliceous components, and aerating agents. The samples are cured by hydrothermal conditions in order to achieve a solid structure by the tobermorite formation. This article is focused on the possibilities of alternative raw material utilizations by preparation of aerated autoclaved concrete and its influence on the workability of fresh mix, water consumption, and basic physical-mechanical properties of hardened samples. Basic raw materials such as lime, cement, sand, aluminium powder, gypsum, and FBC fly ash were used in the experiment. At 20% wt., recycled glass, coal slag, and two types of fibre-like glass were used as a substitution for sand. As a first step, properties in their fresh state were determined, mainly consistency and how it was influenced by water absorption of alternative raw materials. The results of the experiments showed that the fibre-like glass has up to twice the absorbency, and to achieve the necessary consistency it is necessary to increase the water/solid coefficient by twofold. Further, the properties in a hardened state, such as bulk density, compressive strength, and coefficient of constructive quality were determined. Fibre-like glass (FLG 2) is the optimal secondary raw material which, with its parameters, is closest to the results of those samples based on primary silica sand.

The incorporation of additive manufacturing into the architectural and structural engineering realms mainly focused on producing physical models of conventional designs that do not showcase the benefits of using this fabrication approach. Furthermore, the design of space frame structures is centered on simple geometric forms where the members are linked using standard joints with unrefined geometries, giving them their industrial aesthetic. Applying additive manufacturing to the design workflow has the potential to create custom joints with optimized structural performance and reduced fabrication lead times. This research explored the application potential of topology optimization in the design and fabrication of structural nodes for space frame structures using additive manufacturing. This paper presents a methodology that streamlines the various stages in the structural optimization of a typical node in a double layer grid space frame. Topology optimization using SIMP is employed to create a structural node with enhanced stress distribution compared to a conventional spherical node. An algorithm streamlining the various post-processing stages into a single Grasshopper script is also presented.