Prestress retention system for stress laminated timber bridge

Details Prestress retention system for stress laminated timber bridge Prestress retention system for stress laminated timber bridge

1990-06-14

1992-03-24

Britts, Ramon S.

Bridges

Deck

Joint

14 24, 52223L, E01D 1912, E01D 1512, E04C 310

Patent

active

050975587

ABSTRACT:
A stress laminated timber bridge deck is disclosed. The deck includes a transversely extending laminate of longitudinally extending timbers and a system for prestressing the laminate. The prestress system includes a pair of longitudinally extending stress distribution channels disposed on opposite sides of the laminate, a number of transversely oriented threaded tension rods, and threaded members, threadably engaged with the tension rods, for tensioning the rods. A disc spring assembly is disposed on each of the tension rods and compressed between the respective stress distribution channels and respective threaded members to reduce the effective stiffness of the deck and thereby reduce prestress losses due to wood creep and temperature variation. A method for measuring prestress in a tensioning rod of the deck of the present invention is disclosed. The method includes the step of comparing the overall height of the disc spring assembly disposed on the rod to a previously determined load-deformation relationship for the disc spring assembly disposed on the rod.

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