Bridge Design for Prestressed Concrete Box Girders 1 of 2

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Rosser Road Bridge Demolition

This is a video of a portion of the Rosser Road Demolition - Phase 1 that occurred October 1 -2 at LBJ and Rosser Road. Unlike the all concrete bridges that were demolished previously, this bridge has steel beams which require the decking to be broken up and each steel beam must be weld cut and removed one by one. The concrete and steel is then recycled for use on this and other projects around the DFW Metroplex.

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Concord covered bridge.

Concord Bridge is 131.7 feet long and 16 feet wide. It was built in 1872. This bridge is open to traffic. It is over Nickajack Creek Fast and high traffic makes a visit to this bridge dangerous. This bridge originally consisted of only two spans, each a queen-post truss with steel (or iron) tension rods. The center abutment, as can be seen in the photo of the steel beams above, seems to have been widened from a previous bridge using the same pier. In the 1950's steel beams were added to support the bridge and additional concrete piers were added. There is also a fourth all-steel support which can be seen in the downstream view.

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Bridge Beam Through Intersection - Beaverton, Oregon

Very, very long beam making a sharp turn through the intersection of Canyon Rd. and HWY 217. Movie courtesy of the Beaverton Police Dept.

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The Rion-Antirion bridge

The Rion-Antirion bridge is situated in an area of high seismic activity, with the two ends of the bridge founded on different tectonic plates, resulting in a relative movement of almost 2cm per year. The principal supports stand in up to 65m of water, and the main pier foundations (cast in a dry dock on-site before being floated to an adjacent area of deep water for completion) measure 90m in diameter. The pier bases too were constructed on-site, before being floated into position in the Gulf, and lowered onto the seabed using water as ballast. The four main pylons, to which the deck sections attached, were built in concrete, using climbing shutters, and reach 164m above sea level. Almost 20000 tonnes of English structural steel was shipped over for assembly into 12.5 metre-long sections for the main bridge deck. The three central spans measure 560m each and the two side spans, 286m. After casting of the concrete decks onto the steel deck sections, each completed 300 tonne unit was lifted into position between the pylons by a 1200 tonne capacity floating crane. Each deck section is supported by two cable stays, anchored at the top in the steel and concrete pylon head. The 1km long Rion viaduct is also constructed of composite steel and concrete, while the shorter Antirion viaduct is concrete/deck slab on pre-stressed concrete beams. The whole project has been completed almost five months inside the five year programme and within budget.



http://www.youtube.com/watch?v=VV_I8yCYozE&hl=en

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