New doctoral dissertation

June 12, 2025

VILNIUS TECH Library invites you to follow the published new dissertations. The dissertation „Stress and strain analysis of an innovative string cable suspension steel bridge structure“ prepared by VILNIUS TECH, Edmundas Beivydas. The dissertation was prepared in 2018–2025. Scientific Consultant – Prof. Dr Algirdas Juozapaitis.

The dissertation was defended at the public meeting of the Dissertation Defence Council of Civil Engineering in the Aula Doctoralis Meeting Hall of Vilnius Gediminas Technical University at 2 p.m. on 12 June 2025.

The research examines the structure of a string cable suspension bridge structure. The string cable suspension system is a hybrid of a stress-ribbon and a string bridge, where both structural schemes are integrated into a unified system. During the research, a new string cable suspension bridge structure and its configuration parameters were introduced. Engineering calculation methodologies for displacements and strains in both string and string cable suspension structures were developed. Numerical and experimental studies were conducted to validate the results. The dissertation consists of an introduction, three chapters, conclusions, references, a list of the author’s publications on the dissertation topic, and appendices. The introductory chapter discusses the research problem and the relevance of the research and describes the research object. It also formulates the research aim and objectives, describes the research methodology, the scientific novelty of the work, the practical significance of the results, and the main defended statements. At the end of the introduction, the author's publications and conference presentations on the topic of the dissertation, as well as the structure of the dissertation, are presented. The First Chapter provides an overview of string cable suspension and stress-ribbon bridge structures and their calculation methods. The chapter concludes with formulated conclusions and the main research objectives of the dissertation. The Second Chapter introduces the new string cable suspension structure and its configuration parameters. It also presents an engineering calculation methodology for the displacements and strains in string and new string cable suspension bridge structures. The numerical analysis of the structure examines its behaviour. The Third Chapter presents experimental studies of string and string cable suspension bridge models. It describes the experimental program, the characteristics of the materials and equipment used in the experiments, and the equipment parameters. The obtained experimental results are also presented and compared with those obtained using numerical methods. Six scientific articles were published on the topic of the dissertation in peer-reviewed scientific journals. Two of them are indexed in the Web of Science database, two are published in journals indexed in other international databases, and two are published in the peer-reviewed journal Science – The Future of Lithuania. The research results of the dissertation have also been presented at two international scientific conferences.

Doctoral dissertation readers can search via VILNIUS TECH Virtual Library.