Movies often portray suspension bridges being destroyed (for example) but often make basic mistakes that reveal a lack of understanding of how these structures work. This article by structural engineer Alex Weinberg, P.E. aims to fix this.
The last remaining Inca rope bridge is the Q'eswachaka, spanning the Apurimac River in Peru. Even though there is a modern bridge nearby, the residents of the region keep the ancient tradition and skills alive by renewing the bridge annually, in June. Several family groups have each prepared a number of grass-ropes to be formed into cables at the site, others prepare mats for decking, and the reconstruction is a communal effort. In 2009 the government recognized the bridge and its maintenance as part of the cultural heritage of Peru.
Tomorrow, January 19, you can watch as the Sellwood Bridge in Portland, OR is moved 33-66 feet to the north in order to allow a new bridge to be built in its place, while still allowing traffic to move over that part of the Willamette River while the construction is taking place.
Timelapse of the Manhattan Bridge shows the bridge flexing up and down as trains pass over it (SLYT). via
Plans for the longest suspension bridge in the world have gotten another go-ahead. The bridge from Java to Sumatra would have a center span of 3km and island-hop a total of 30 km. Concepts have been floated for several years, now focusing on a bridge rather than a tunnel project. [more inside]
Construction of the World's Highest Bridge, Millau Viaduct in France, which is slightly higher than the Eiffel Tower. It is now included in a list of Google Earth extremes. World's most interesting bridges. Gallery of beautiful world bridges. [more inside]
The Digital Bridges Project Digitized 19th century bridge engineering documents. Luckily for people like me, they've collected links to all the illustrations on one page. See for instance an amazing chronological series of pictures documenting the construction in 1892 of the 330 feet high, 3000 foot long, Pecos Viaduct in Texas.
Leonardo's Bridge became a reality, with the construction of the 100 meter bridge spanning the E-18 in the township of Ås, east of Oslo. The design of the bridge makes modern bridges seem old in comparison. It seems that many of DaVinci's 500 year old ideas are coming to fruition.