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Loads are just supported like at any other structures subject to dynamic loads; if only simpler in that being a quite common structural type the checks have been somewhat reduced to some specific formulations. So impact factors appear as substitute of dynamical studies.
Also, fatigue (and stress concentration etc) becomes paramount giving the cyclical solicitations. So some kind of structural types (simply supported beams) use to be preferred to others to help to reduce the effort in designing the structures and get simpler and of easier maintenance structures.
