Accidental actions for bridges

(1)P If one or more of the following loading systems are possible during construction, the limit state to be checked is the prevention of (progressive) collapse.

(2) The action (including dynamic effects) due to the fall of a travelling form during its movement in the case of a bridge built by the cantilever method should be considered as an accidental action.

(3) The action due to the fall of a prefabricated element should be considered as an accidental action and should be taken into account, where relevant.

(4) Actions due to impact from construction vehicles, cranes or building equipment to loadbearing structural parts should be defined in the project specification, where relevant.

(5) The principles of verification in case of local failure of a temporary support of loadbearing structural parts should be defined in the project specification.

Note : This type of accidental design situation includes the possible failure of a stay during the execution phase of a cable-stayed bridge.

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