POSSIBILITIES FOR UPGRADING OF AN OLD STEEL RAILWAY BRIDGE IN ACCORDANCE WITH PRESENT EXPLOITATION REQUIREMENTS

Tsvetan Blagoev; Martina Nikolova; Lazar Georgiev; Milcho Lepoev

Scientific paper ID 1227 : 2015/3

POSSIBILITIES FOR UPGRADING OF AN OLD STEEL RAILWAY BRIDGE IN ACCORDANCE WITH PRESENT EXPLOITATION REQUIREMENTS

Tsvetan Blagoev, Martina Nikolova, Lazar Georgiev, Milcho Lepoev

In the railway infrastructure of the Republic of Bulgaria 331 steel bridges with total length 11201,70m and total area of 356409m2 are in operation. Significant part of them are riveted with open deck (the sleepers are directly supported on longitudinal or on main girders) which is not in accordance with present exploitation concepts. In this paper possibilities for upgrading to the present exploitation ments of bridges with railway above the main girder, by means of partial or full replacement of the deck with closed type, are discussed. Possibilities and effects on some parameters characterizing the structural behavior of the bridge for the case of making closed reinforced concrete deck, connected for composite action with members of the old structure are analyzed.

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стари стоманени мостове железен път стоманобетонни пътни конструкции съвместна работа.old steel bridges railway track reinforced concrete deck composite action.Tsvetan Blagoev Martina Nikolova Lazar Georgiev Milcho Lepoev

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