Innovative Stress-Ribbon Bridge

East and West Golf Cart Bridges at the "The Bridges at the Horizon Club", Rancho Santa Fe, California, USA

In order for golf carts to cross over 100 m wide and 30 m deep canyons that have significant environmental sensitivity, the owners of "The Bridges at the Horizon Club"
(a private residential community), decided on two post-tensioned stress-ribbon bridges. This relatively new technology uses 25 segments of precast concrete, 3.9 m wide by 0.43 m deep, assembled over multistrand tendons ("ribbons").

Tendons within these "ribbons" are incrementally post-tensioned as these "ribbons" gain dead load as the precast segments are installed. Horizontal forces from the post-tensioning tendons are resisted at the abutments by rock anchors. The two identical ribbon bridges have a span length of 87 m and a sag of 2.24 m.

Engineer T.Y. Lin was awarded the ACEC 2000 Award of Excellence by the American Consulting Engineers Council (ACEC) for this innovative bridge design.

General Contractor FCI Constructors, San Diego, California +++ Owner Lennar Homes of California, Inc +++ Engineering T.Y.Lin International/McDaniel Engineering, San Diego;Jiri Stratsky, Ph.d.,P.E., Consulting Engineer, Mill Valley, California +++ Post-tensioning subcontractor DSI, Long Beach DSI Services Supply and installation of 14 tons DYWIDAG Multistrand Tendons type MA, stressing and grouting, job site technical assistance.