Defense of the dissertation of Tulekov Auyezkhan for the degree of Doctor of Philosophy (PhD) in the specialty «8D07113 - Transport, transport technics and technologies»

L.N. Gumilyov Eurasian National University, a dissertation defense for the degree of Doctor of Philosophy (PhD) by Tulekov Auyezkhan on the topic «Justification and development of the calculation model of a tower crane boom » to the educational program «8D07113 – Transport, transport technics and technologies».

The dissertation was carried out at the «Transport engineering education department» of L.N. Gumilyov Eurasian National University.

The language of defense is kazakh

Official reviewers:

Temporary members of the Dissertation Committee:

Scientific advisors:

Balabekova Kyrmyzy Gynayatovna-PhD, Associate Professor at the Eurasian National University named after L. N. Gumilyov

Sakhapov Rustem Lukmanovich, Doctor of Technical Sciences, Professors at the Kazan Federal University. (Kazan, Tatarstan)

The defense will take place on June 06, 2026, at 10:00 AM in the Dissertation Council for the training direction «8D071 – Engineering and engineering trades» in the specialty «8D07113 – Transport, transport technics and technologies» of L.N. Gumilyov Eurasian National University. The defense meeting is planned to be held online.

Link: https://teams.microsoft.com/meet/41669132784514?p=gMG7daB4t2fLZHT3ki

Address: Астана қ., Қ.Сатпаев к.,2, №302 ауд

Abstract (English): The thesis is devoted to the theoretical substantiation and development of a computational model of the boom of a tower crane as an extended spatial load-bearing system operating under conditions of complex force and deformation interaction. The relevance of the research is determined by the need to improve engineering calculation methods for the metal structures of lifting and transport machines, increase the reliability of stress–strain state prediction, and ensure the required levels of structural reliability and operational safety of tower cranes. Modern trends in the development of lifting equipment are characterized by increasing demands for lifting capacity, material efficiency, structural weight reduction, and growing complexity of structural configurations. Under these conditions, traditional calculation approaches based on simplified engineering assumptions do not always provide sufficient accuracy in describing the mechanical behavior of booms, which necessitates the development of more universal and theoretically grounded models. Of particular importance is the correct representation of the tower crane boom in the form of an equivalent design scheme that allows the key factors governing stresses, displacements, and structural stability to be taken into account. The dissertation analyzes the design features of tower cranes and their load-bearing systems, examines the principal types of booms, the nature of the applied loads, and the mechanisms governing the formation of internal forces. The necessity of applying structural idealization methods, which enable a real spatial truss system to be transformed into an analytically solvable computational model, is substantiated. Based on the principles of strength of materials and continuum mechanics, a mathematical model describing the mechanical behavior of the boom under the action of concentrated and distributed loads has been developed. Special attention is paid to the formulation of the calculation scheme, as well as to the selection of assumptions and model parameters that ensure the physical interpretability of the results. The study considers equivalent bending stiffness, the influence of self-weight, boundary conditions, and specific features of the stress state. Analytical relationships have been derived that make it possible to determine internal forces, stresses, and deflections in the characteristic sections of the boom. To verify the validity of the theoretical provisions, numerical simulations using modern finite element methods were performed. Finite element models were developed, boundary conditions and stress factors were defined, and the distributions of stresses and displacements were analyzed. The convergence of the numerical solutions was investigated, and the obtained results were interpreted. A comparative analysis of analytical and numerical solutions confirmed the adequacy of the proposed computational model. The study also analyzes the influence of geometric design parameters and material properties on the stress–strain state of the boom. The parameters governing system stiffness and strength are identified, and the patterns of structural response variation are established. An assessment of element stability and nodal connections, including local stress conditions in the most critical zones, was conducted. The scientific novelty of the research lies in the development of a theoretically substantiated computational model of the tower crane boom that provides an accurate description of its mechanical behavior and stress–strain state. New computational relationships have been obtained that refine the understanding of the behavior of extended spatial structures of this type. The proposed approach is characterized by methodological consistency and applicability to a wide class of similar engineering systems. The theoretical significance of the work is defined by the advancement of computational modeling methods for load-bearing systems of lifting and transport machines and the refinement of concepts describing the mechanics of tower crane booms. The practical significance of the research lies in the potential application of the developed model in engineering calculations, design, and structural analysis of tower cranes, as well as in assessing their operability and reliability. The results obtained may be applied in scientific research, engineering practice, and the educational process for training specialists in mechanics, mechanical engineering, and the design of lifting and transport machinery.

Dissertation

List of Scientific Works

Consultant's Review

Foreign Consultant's Review

Conclusion of the Research Ethics Committee