EAN: 9783836672986

COLLAPSE ANALYSIS OF EXTERNALLY PRESTRESSED STR...

The use of external prestressing is becoming more popular throughout Europe due to their
expected higher durability and the possibility of active maintenance of the prestressing
cables. Questions have been raised about the behaviour of these structures beyond service
loads. A comprehensive numerical analysis has been carried out comparing the behaviour of three
different types of externally prestressed bridges to a conventionally internally prestressed
bridge. The external types are a monolithically built bridge with external tendons  a
monolithically built bridge with external tendons and blocked deviators  and a precast
segmental bridge with external tendons. The internally prestressed bridge is monolithic. The
primary objectives are to determine whether or not ductile failure occurs  i.e. the
load-deflection response  and the tendon stress increase at ultimate stage. The results show
that the monolithically built bridges have a considerable higher ultimate moment capacity as
well as deflection. This shows the advantage of using continuous ordinary reinforcement. All
externally prestressed types did not reach the capacities of the internally prestressed bridge.
It was found that ductility depends mostly on the reinforcement within the cross-section.
Externally prestressed girders have no prestressing cables in the cross-section and need
sufficient ordinary reinforcement in order to deform ductile. Although the tendon stress
increase up to failure in the actual analysis is remarkable  the discussion shows that the
magnitude varies greatly depending on the layout of the whole structure.

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