V-shaped Cable-stayed Motorway Bridge will replace the Bottle-framed Bridge that collapsed in January.
It was not long ago where a cable-stayed suspension bridge collapsed resulting in the deaths of People on or near the structure. On 18 January, the Chirajara Bridge, a 450-meter long cable-stayed bridge spanning a very deep gorge that was supposed to have served a motorway connecting Bogota, the capital of Colombia and and the City of Villavicenio collapsed, killing nine workers and injuring eight. All but 80 meters of the bridge was completed when one half of the bridge collapsed, as seen in the video below. More lives would have been lost had 180 workers not attended a seminar off-site. In July, the remaining span was imploded in the same ravine where a mudslide had killed 23 people in 1973.
A new span is being planned. Two subsidiaries of the French Company Effage have agreed to a contract to construct a new span. It will be the same Bridge type in a cable-stayed Suspension design, but the Towers will have a V-shape instead of the bottle shape, as was seen in the now demolished span. The new span will be 150 meters above the ravine but the bridge will be much shorter than the 450-foot bridge- a total of only 290 meters. Construction is expected to take 18 months, four of which will be reserved for planning.
Inspite this, the collapse of the Chirajara Bridge has raised concerns about the structural stability and safety of the cable-stayed bridges in general, for due to problems with the cables and the bridge decking. Already hot in the news was the recent collapse of the Morani Bridge in Genoa, Italy, other bridges have been under the loop due to structural instability, including the Fort Steuben Bridge in Ohio, the Köhlbrand Bridge in Hamburg and the Oakland section of the San Francisco-Oakland Bay Bridge. Some are asking whether other bridge designs would be more viable than the cable-stayed bridges, even though dozens have been built over the past year, including three in New York City. Yet the construction of the new Chirajara Bridge will help improve traffic between the two previously mentioned cities in Colombia, reducing the travel time by 25 minutes along the new motorway. In the long term, however will it make sense. We won’t know about it for another 30 years. And when we meet it again, will the problems with cable-stayed bridges still persist or will we have to rethink the way we travel, impacting the Environment.
Collapse of the Bottle-Frame:
Implosion of the Bottle-Frame:
Link with details on the new span: