Dynamic analysis of load eﬀects for railway bridges on Malmbanan
This report present a load eﬀect analysis of 35 railway bridges on the iron ore line Malmbanan. Many of these bridges were originally designed for 25 tonnes axle load
or less and is currently the subject of an upgrade to 32.5 tonnes axle load. The main aim of this study is to explore if the dynamic ampliﬁcation factor can be decreased
for the new trains at a speed of 70 km/h. Dynamic eﬀects are often accounted for by a dynamic ampliﬁcation factor of the static response. For real trains EN 1991-2 deﬁnes ϕ′ as a dynamic impact component and ϕ′′ as additional dynamic eﬀects from track irregularities.