XIII Međunarodno naučno-stručno savetovanje Ocena stanja, održavanje i sanacija građevinskih objekata (str. 440-449)
АУТОР(И) / AUTHOR(S): Philippe Van Bogaert
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DOI: 10.46793/SGISXIII.45PB
САЖЕТАК / ABSTRACT:
Current regulations mandate that structures be designed with adequate robustness, which can be achieved by adding more resistance to members or by developing other load paths. The latter routes appear to be an impractical solution in the event of a column pier demolition after collision since another column or bracing cannot replace the loss of a crucial support. A concrete bridge’s adjacent beams are out of balance if all of the pier’s columns are demolished, unless they become continuous, in which case a commensurate bending moment may occur. Two forces can be used to deliver the latter. The bridge slab itself provides the compressive force on top of the beams. A steel plate positioned beneath the adjacent beams’ bearings can supply the tensile force. A simple experiment has enabled to validate this idea. Two examples of concrete bridges have been used to test this theory. A typical road bridge of two 22.5 m span with traditional I-section girders and a 34 m span bridge with 39 precast prestressed hollow core girders. In order to counteract the effect of bonded tendons becoming inactive at the extremities of the PC-beams, dummy cables are required. While there are still some details to be worked out, the overall concept seems to be working and could satisfy the robustness criterion.
КЉУЧНЕ РЕЧИ / KEYWORDS:
Robustness, PC-girder bridge, accidental conditions, dummy prestress, experimental demonstration
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