Master's Thesis

Design of a steel railway bridge over the D6 motorway near Petrohrad

Final Thesis 282.11 kB Appendix 8.4 MB

Author of thesis: Ing. Peter Krňa

Acad. year: 2025/2026

Supervisor: Ing. Petr Nečesal

Reviewer: Ing. David Marván

Abstract:

This Master’s thesis focuses on the design of the main load-bearing steel structure of a railway bridge crossing the D6 motorway near Petrohrad, located on a single-track, 2nd class railway line between Plzeň and Žatec. The bridge has a span of 58 m, is situated on a straight track section, and structurally functions as a simply supported beam. The main load-bearing element consists of a pair of full-web girders with an open I-section, stiffened by a closed-section arch with vertical hangers, forming a so-called Langer girder. The total length of the steel structure is 59.2 m and its height is 11.0 m, with an axial distance between the girders of 6.05 m and a total bridge width of 6.8 m. The bridge deck is designed as an orthotropic deck with longitudinal flat bar stiffeners, while in the transverse direction, the deck plate is reinforced by inverted T-section cross-girders at axial intervals of 2.0 m. The arches are interconnected at three points by closed-section frame bracing. The connection of the girder, arch, and hangers is realized using gusset plates. The entire structure is mounted on four spherical bearings and is designed using S355 grade steel.

Keywords:

Arch bridge, lower bridge deck, steel structure, beam-element model, simply supported beam

Date of defence

04.02.2026

Result of the defence

Defended (thesis was successfully defended)

znamkaBznamka

Grading

B

Process of defence

Student v rámci obhajoby prezentoval zadání a hlavní výsledky své závěrečné práce a vyjádřil se k připomínkám a dotazům oponenta. V následné diskuzi reagoval na připomínky a dotazy členů komise k závěrečné práci: prof. Ing. Josef Vičan, CSc.: Počítal jste spolupůsobící příčník pro smykové ochabnutí? Jak je namáhána mostovka v systému Langerova trámu? prof. Ing. Marcela Karmazínová, CSc.: Řešení připojení táhel. Jak byl volen průjezdný profil mostu? Ing. Ivan Balázs, Ph.D.: Je navržená mostovka ortotropní? Jak byla navržena tloušťka mostovky? Co je to smykové ochabnutí a kdy nastává? Jaká je navržena hydroizolace? Ing. Antonín Pechal, CSc.: Byla v rámci závěrečné práce řešena i montáž mostu? Ing. Radim Pokorný: Uložení mostu a přenos sil do spodní stavby? Student reagoval velmi dobře.

Language of thesis

Czech

Faculty

Fakulta stavební

Department

Institute of Metal and Timber Structures

Study programme

Civil Engineering – Structural and Transport Engineering (NPC-SIK)

Composition of Committee

prof. Ing. Josef Vičan, CSc. (předseda)
prof. Ing. Marcela Karmazínová, CSc. (místopředseda)
prof. Ing. Jiří Kala, Ph.D. (člen)
doc. Ing. Jan Barnat, Ph.D. (člen)
Ing. Ivan Balázs, Ph.D. (člen)
Ing. Michal Štrba, Ph.D. (člen)
Ing. Antonín Pechal, CSc. (člen)
Ing. Radim Pokorný (člen)

Supervisor’s report
Ing. Petr Nečesal

Grade proposed by supervisor: A

File inserted by supervisor Size
Posudek vedoucího práce [.pdf] 55,93 kB

Reviewer’s report
Ing. David Marván

Grade proposed by reviewer: A

File inserted by the reviewer Size
Posudek oponenta [.pdf] 59,89 kB

Responsibility: Mgr. et Mgr. Hana Odstrčilová