A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Repair, maintenance and modernisation of damaged steel spans of truss railroad through bridges with composite deck
In Poland there is a considerable number of old, steel truss railroad through bridges whose decks, usually in the form of traditional open grillage consisting of crossbeams and stringers, need to be modernised as they are to be adapted to the high speed (140-200 km/h) running of trains in most cases, on ballast. Since the early 80s when railroad lines began to be modernised in Poland, such solutions started being applied to new, truss steel spans which gained popularity because they could span longer obstacles more easily. After several years of hard service, reports of damage to the structure of the steel spans in this kind of truss bridges, both new ones and those undergoing modernisation, started coming in from different regions of Poland. Numerous cracks were found in the bottom and top flanges of the chords of the main girders and in some parts of the reinforced concrete slab, particularly over supports in the case of multispan structures. Several methods of constructing various types of composite decks (steel + concrete) in the form of a reinforced concrete slab mating or not with the deck are given. Research to which the damaged superstructures of such bridges were studied are described, the causes of failures are analysed and methods of protecting the damaged span structure components are given. The analysis is verified by static-strength calculations done using computer software. The presented solutions allow one to adapt in a relatively simple way in view of new standard requirements and high speeds (140-200 km/h) old, steel railroad through bridges with an open deck (grillage) to a closed deck and trains running on ballast, without it being necessary to reconstruct their spans completely or to replace them by new, modern ones. The use of breakstone ballast in this kind of bridges ensures, despite the considerable dynamic loads, a high level of safety. The dynamic impact has been reduced through the use of a reinforced concrete slab for the deck and the use of ballast, which is particularly important in the case of old, steel bridge structures.
Repair, maintenance and modernisation of damaged steel spans of truss railroad through bridges with composite deck
In Poland there is a considerable number of old, steel truss railroad through bridges whose decks, usually in the form of traditional open grillage consisting of crossbeams and stringers, need to be modernised as they are to be adapted to the high speed (140-200 km/h) running of trains in most cases, on ballast. Since the early 80s when railroad lines began to be modernised in Poland, such solutions started being applied to new, truss steel spans which gained popularity because they could span longer obstacles more easily. After several years of hard service, reports of damage to the structure of the steel spans in this kind of truss bridges, both new ones and those undergoing modernisation, started coming in from different regions of Poland. Numerous cracks were found in the bottom and top flanges of the chords of the main girders and in some parts of the reinforced concrete slab, particularly over supports in the case of multispan structures. Several methods of constructing various types of composite decks (steel + concrete) in the form of a reinforced concrete slab mating or not with the deck are given. Research to which the damaged superstructures of such bridges were studied are described, the causes of failures are analysed and methods of protecting the damaged span structure components are given. The analysis is verified by static-strength calculations done using computer software. The presented solutions allow one to adapt in a relatively simple way in view of new standard requirements and high speeds (140-200 km/h) old, steel railroad through bridges with an open deck (grillage) to a closed deck and trains running on ballast, without it being necessary to reconstruct their spans completely or to replace them by new, modern ones. The use of breakstone ballast in this kind of bridges ensures, despite the considerable dynamic loads, a high level of safety. The dynamic impact has been reduced through the use of a reinforced concrete slab for the deck and the use of ballast, which is particularly important in the case of old, steel bridge structures.
Repair, maintenance and modernisation of damaged steel spans of truss railroad through bridges with composite deck
Reparatur, Instandhaltung und Modernisierung von beschädigten Stahlstützen von Fachwerk-Eisenbahnbrücken
Jakiel, P. (author) / Manko, Z. (author)
1996
10 Seiten, 8 Bilder, 10 Quellen
Conference paper
English
Steel deck bridges with long rib spans
| Engineering Index Backfile | 1964
Replacement of the Merchants Bridge Deck Truss Spans
| British Library Conference Proceedings | 2006
Floating swing spans for railroad bridges
Engineering Index Backfile | 1932
Behavior of Ductile Steel Retrofitted Deck-Truss Bridges
| British Library Conference Proceedings | 2002
Ductile Seismic Retrofits of Steel Deck-Truss Bridges
| ASCE | 2000