Abstract

Safety analysis of cantilevered bridges can be applied to spans and supports. The paper concerns effects of overloading of temporary supports, usually used for erecting concrete cantilevered spans. Influence of selected factors is considered on the example of bridge, built in Kędzierzyn-Koźle. The length of the main span of this prestressed concrete box girder bridge is 140 m. Supports of the structure are loaded untypically, due to skewness of the bridge. Proposed span overloading coefficients are used for evaluation of structure safety in erection stage. In the paper design solutions of dead load asymmetry (arrangement of cable anchorages along the span length), influence of random factors (segment cross-section dimensions assumed as random variables) and segment concreting asymmetry are considered. Different coefficients of segment and cantilever overloading are distinguished. The first one usually have greater values, than calculated on their basis global value for the whole cantilever.