Structural behaviour and stability of steel beam-column elements in under-deck cable-stayed bridge

Ieva Misiūnaitė

Doctoral dissertation

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The dissertation investigates the issues addressed to Under-Deck Cable-Stayed (UDCS) bridge, analyses its in-plain structural behavior and stability verification with an approach of Advanced Analysis.

The main objects of research include effective form-finding of steel UDCS bridge, structural behaviour and stability analysis by means of beam-column elements based on the Direct Analysis Method.

The study approaches a few main tasks such as a new form of UDCS bridge by accounting for the economical and efficient structural design criteria; dealing with the generalized calculation models of the additionally restrained steel beam-column elements; the development of the computational method for the direct analysis of the steel structures and especially bridges using generalized calculation models and outlining practical guidelines for UDCS bridge design.

The dissertation consists of five parts including Introduction, 4 chapters, Conclusions, References and 3 Annexes.

The introduction reveals the investigated problem, importance of the thesis and the object of research and describes the purpose and tasks of the paper, research methodology, scientific novelty, the practical significance of results examined in the paper and defended statements. The introduction ends in presenting the author’s publications on the subject of the defended dissertation, offering the material of made presentations in conferences and defining the structure of the dissertation.

Chapter 1 revises used literature. At the end of the chapter, conclusions are drawn, and tasks for the dissertation are reconsidered.

Chapter 2 develops a new structural form for the UDCS bridge, deals with the calculation models of initially perfect beam-column with additional elastic restraint and suggests computational method for the solution of the non-linear problem verifying the stability of the under-deck cable-stayed bridge.

Chapter 3 improves computational method, which has been proposed in Chapter 2, by accounting for imperfections. Moreover, this chapter suggests the new technique for the structural response control and practical guidelines for such structures design.

Chapter 4 provides experimental investigation of three scale UDCS bridge model.

6 papers focusing on the subject of the discussed dissertation are published: one paper – in the Thomson ISI register, one paper – in conference material in Thomson ISI database, one paper – in journal quoted by Inspect database, three papers – in material reviewed during international conferences. 4 presentations on the subject have been given in conferences at international level.

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145×205 mm
198 p.
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