engleski

Experimental investigation of a steel railway bridge strengthened with UHPRFC deck slab

Growing number of aging, structurally deficient and obsolete railway bridges are facing infrastructure managers, owners and operators with decision making dilemmas about constant repair and maintenance activities and decommissioning choices. New sustainable materials are being developed during past decades which deliver novel possibilities in infrastructure asset management. Ultra High Performance Fibre Reinforced Concrete is a material that has been used as a strengthening solution for concrete bridges for some time now. The difference between UHPFRC and conventional concrete regarding mixture is in the amount of binder, the size of the aggregate and the presence of fibres. Compared to a conventional concrete, the matrix of the UHPFRC is much denser which influences its durability due to additional impermeability protection. Superior material characteristics and its workability have already been proven in practice. This paper describes a case study dealing with a UHPFRC-steel composite structure which is a solution which has much less been analysed and investigated. The case study presents results of experimental investigations performed on an actual steel bridge, the Buna bridge, which was decommissioned and transported into the laboratory. Static and dynamic testing was performed on the bridge before and after casting of a UHPFRC deck slab on the steel superstructure in the laboratory.

steel bridge, UHPFRC, static testing, dynamic testing

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