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Construction objects arise during the implementation of construction projects. Participants in these projects are interested in taking systematic actions to improve the state of occupational safety and health protection. The effectiveness of these activities requires that they be carried out as part of a comprehensive system of managing the construction project implementation process. The safety management...
The article proposes the concept of experimental dynamic tests of aggregate behavior - sand used as a material for covering temporary protective shelters for the population and civil defense. These shelters are part of the construction shielding infrastructure useful in crisis situations. Laboratory tests of loose soil, including sand, with impact loads are based on the Split Hopkinson Pressure Bar...
The work touches on the national security issues of large-panel buildings from the point of view of settlement of the building on the ground. Displacements of the structure in the level of foundation of the building structure cause the secondary distribution of stresses, thus the possibility of structural scratches of internal prefabricated plate elements. The original model FEM of the construction...
The article discusses the essence of dependability for the military vehicles, the knowledge of which ensures success in the mission and provides an appropriate level of the crew safety while executing combat tasks. The paper also includes an analysis of factors affecting the dependability for the military vehicles.
The purpose of this article is to develop an analytical model for determining the weakening of the thermal insulation capacity of porous materials - mineral wool and polystyrene because of increased water content. In the dry state, it was assumed that the sample consists of a skeleton and air-filled pores without process moisture content. In the second shot, however, dry material skeleton and pores...
The typical combined heat and power plants requires the introduction of additional heating medium. The alternative solution is the direct integration of the exhaust gases from heat engine. The high temperature, surplus oxygen and low water content of the GTs exhaust gases enabled the successful integration at industrial scale as: preheated combustion air for industrial furnaces, heat source for drying...
The article addresses the issue of unmanned aircraft vehicles used in the armed forces of the Republic of Poland as a technological object undergoing the exploitation process in accordance with an event-based exploitation model. The author discusses problems related to the semantics of drones, which, in conjunction with the study of technical documentation and participant observation, allowed to qualify...
In the modern world, knowledge is treated as another resource necessary for the development of civilization. An important element is information, thanks to which you can update knowledge and thus create a compendium of knowledge. Knowledge and its organization is particularly useful in construction. The article proposes a knowledge map, which is a record of domain knowledge. The fields were designated...
The effect of calcium sulfoaluminate additives (CSA) on the compression and bending strength of mortar, as well as linear deformation of prism samples at different environmental humidity was studied. Test results indicate that bending strength of mortars with CSA and the referent at the age of 28 days are practically equal. Compressive strength of mortars with CSA reduced by 20 ... 23% for all dosages...
The paper presents the results of FEM computer analysis regarding cracking of the wall prefabricated element. The proprietary coating model of the Wk-70 System large-panel building construction was used. For analysis, a construction diaphragm has been separated that is integrally connected to the vertical communication structure. Modeled through the scratch in the attic wall and compared with the...
The development of global economic dependencies contributed to the significant demand increase for financial information about companies. Only reliable and transparent financial statements are a useful source of information. To provide security and protection for the stakeholders, financial statements must be audited. In Poland the current thresholds obliging companies to audit financial statements...
Fiber reinforced polymer (FRP) bars, as a structural reinforcement, are characterized by the number of advantages, such as: high strength-to-density ratio; absence of corrosion; resistance to the negative influence of the different aggressive mediums. Nevertheless, a wide practical application of such a bars finds an embarrassment because of the law modulus of elasticity (it varies from 30 GPa to...
The subject of the article is the impact of measurement deviations of three-layer walls on the durability of these walls in buildings erected according to the OWT-67 / N system. This problem mainly concerns the external facade texture layer, which, apart from its own weight load, is exposed to the destructive influence of external factors, which include wind suction load and temperature load. The...
The paper presents selected technical and legal areas of the exploitation of a pneumatic launcher as an essential part of the mechanical test stand of the split Hopkinson bar for testing the dynamic properties of construction materials. The process of impact loading of the tested material sample is carried out by means of a loading bar-projectile fired from this launcher. The concept of the first...
The article describes legal regulations regarding the safety of building objects in the process of implementing construction projects. International (International Labor Organization), EU (EU), national (Poland) and industry (Polish regulations concerning the construction industry in Poland) regulations were presented. These requirements have a fundamental impact on the safe behavior of building process...
In the paper base reactivity parameters of acetylene are considered. The terms of safe usage of acetylene are interpreted and related to their molecular structure. Unusual susceptibility of acetylene to exothermic self-decomposition is analysed. Chemical composition and parameters of acetylene decomposition at various initial states are estimated in thermodynamic calculations. Combustion and explosion...
The paper discusses two main design strategies when checking for reliability and considers accidental action combinations according the various codes. If accidental actions can be identified, one of the possible design strategies is checking the “key element”. This strategy minimizes the possibility of local failure and subsequent progressive collapse. The combination of actions for accidental design...
Ensuring a safe evacuation for the users of a building is a major goal when designing structures and systems protecting them against the effects of a fire. The article discusses the safety assessment for evacuation of users from a building exemplified by an analysis using computational fluid mechanics to reproduce the environmental conditions during a fire. It presents a way to evaluate the possibility...
The paper discusses the problem of the growing threat of orbital collisions – the Kessler syndrome in the Earth’s lower orbit caused by orbital satellite constellations developed to provide broadband internet. It provides a theoretical context for the main argument by presenting the current data related to space debris in orbit, the concept of the Kessler syndrome and its application to orbital objects,...
Construction objects are anthropogenic objects that meet human needs in the area of housing. They should be designed, made and used in a way ensuring the safety of people and property at every stage of its life cycle. To achieve this effect, the cooperation of designers, contractors and users of the facility is required. It is especially important for building contracting. Safe construction implementation...
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