The creep of concrete is one of the main problems threatening concrete structural development and the stability and safety of structures. However, the nonlinear theory is the key to solving the problem of taking into account the physical and mechanical properties of concrete creep in shell structures. To create such a theory, the original shell is replaced by a continuous equivalent elastic shell. To determine the stress–strain state of the structure, the equations of nonlinear creep and crack growth are derived, and a deformation model of the section is created. The behavior of the structure at all stages of the life cycle is investigated by solving the solving systems of differential equations of equilibrium, motion, and perturbation of the equivalent shell. The values of the ratios of dependence of long-term and short-term critical loads on deformations, forces, cracks, etc., are given. The accuracy of the solution of the developed nonlinear theory is compared with the linear theory of concrete creep as well as experimental data. The results show that, according to the linear theory, for the values for the short term and long term, up to 56% and up to 39% of critical loads are overestimated, respectively. The creep process in practical engineering can be effectively controlled by the results of the proposed theory.

This study explores task-specific ionic liquids (TSILs) in smart floor systems, highlighting their strong electrical rectification abilities and previously established wood preservative properties. Two types of TSILs, featuring a “sweet” anion and a terpene-based cation, were used to treat selected wood samples, allowing for a comparison of their physical and electrical performance with untreated and commercially treated counterparts. Drop shape analysis and scanning electron microscopy were employed to evaluate the surface treatment before and after coating. Near-IR was used to confirm the presence of a surface modifier, and thermogravimetric analysis (TGA) was utilized to assess the thermal features of the treated samples. The different surface treatments resulted in varied triboelectric nanogenerator (TENG) parameters, with the molecular structure and size of the side chains being the key determining factors. The best results were achieved with TSILs, with the instantaneous voltage increasing by approximately five times and the highest voltage reaching 300 V under enhanced loading. This work provides fresh insights into the potential application spectrum of TSILs and opens up new avenues for directly utilizing tested ionic compounds in construction systems.

Based on the requirements of the current regulatory documents, it is necessary to conduct periodic monitoring of the condition of man-made and engineering structures on the territory of Kazakhstan. The control system takes into account the basic principles, concepts and methods in relation to the specifics of objects and parameters of technical control, as well as the specifics of the introduction of new technologies and, accordingly, the development of a new methodology for assessing the condition of the object of study. The purpose of this work is to conduct a comprehensive study of hydraulic structures using innovative equipment and approaches. In particular, the main tasks of the work: Determination and assessment of the technical condition of enclosing dams based on the results of field observations, instrumental measurements and calculated indicators. This will allow you to assess the current state of the structures and identify possible deformations or damage. Analysis of the influence of various loads, including permanent, dynamic and temporary, on the stress-strain state of the dam. This will allow us to determine how various factors affect engineering structures and what changes can occur in the long term. Development of recommendations to ensure the reliability, safety and functional suitability of the studied hydraulic structures. These recommendations will be based on a comprehensive analysis and will provide practical solutions to maintain the structural integrity and efficiency of structures. The scientific novelty of this work consists in the application of modern methods of geophysical research and innovative equipment for the technical assessment of hydraulic structures. This opens up new opportunities for improving the accuracy and reliability of assessing the condition of structures in a rapidly changing environment.