experimental research

The research is about concrete hollow blocks that have been and still are used widely in basement wall construction. It shows that only 10… 30% of their strength is used even for mid and high-rise construction. Therefore massive foundation blocks should be made with hollows. By design, optimized blocks can be combined into the following groups: with large cavities, open from below, with vertical closed and through cavities, horizontal cavities and ribbed.

The directions of energy and resource saving remain a priority in building science. This is especially concerns to the structural elements of mass production. These elements include large concrete blocks of basement walls (foundation blocks), theirs bearing capacity, even in high-rise building, is used only for 30–50 %. Therefore, starting with the widespread establishment in construction, various ways to improve their constructive forms were proposed to reduce their own weight and optimization. One of the most effective ways is cavity formation.

The article analyzes the experimental research of rod steel and reinforced concrete structures reinforced with steel plates, which showed that all samples general is that under load was hogging the longitudinal axis of the element, leading to uneven distribution of longitudinal strain in reinforcement sheet, in consequence of which corrugated been arising by the opposite direction of the bend. These results emphasize the importance of stability in flexible steel and reinforced concrete rod structures.

Comparative analysis of the results of natural frequencies and bending vibrations determination for the metal mast lifting device with the application of theoretical and experimental methods is conducted in this article. In particular, results of the mathematical modeling of the transverse vibrations of the mast with the application of S. s theory and matrix method of initial parameters are considered, as well as the results of the experimental research of mast vibrations of a real lifting device.