An Evaluation of the Construction of Britannia Bridge

The Britannia bridge completed in 1850 was the idea of ​​Robert Stephenson going the cutting edge of civil engineering and reached an unprecedented scale in every aspect of architecture. Construction began in 1846 and was completed in 1850 with the intention of crossing the Menai Strait through Chester and Holyhead Railroad. The Britannia Bridge must be a tubular bridge to meet the standard set by the Navy Department and the bridge span should be at least 100 feet above the Menai Strait.

On May 23, 2018, NTSB announced a preliminary report entitled "Road: The Collapse of the Miami Building Footbridge in Florida (HWY 18 MH 009)". The report summarizes the accident and states that they are evaluating the bridge design, construction process and building materials. They also said they are evaluating the occurrence of cracks in the diagonal members 2 (the southern end of the bridge) and 11 (the northern end of the bridge) and the propagation of cracks in the area of ​​the diagonal member 11. The crack of the picture comes out from February 24th.

According to the design plan of the bridge, on March 10, the builder stretched the oblique members of the bridge at the north and south edges of the bridge. When a crash took place on March 15, construction workers were placed on the structure, and 11 diagonal members connecting the canopy and the northern end deck of the bridge were reinstalled. As this work uses a crane, two of the three west bound roadways under the northern end of the bridge are passable, but five eastern roads are still open, east bound traffic is bypassed not. NTSB evaluates bridge design, construction process, building materials. The NTSB also evaluates the occurrence of cracks in the propagation of cracks in the diagonal members 2 (the south end of the bridge) and 11 (the northern end of the bridge) (see FIG. 3) and the diagonal member region 11.