This paper has detailed the serious collapse accidents of bridges at home and abroad. The causes of accidents are lack of cognition, design and construction defects, natural disasters, and poor management and maintenance. The past events are not forgotten, the aftermath of the division, these accidents remind us that bridge engineers should complete the construction of bridges with a high sense of responsibility to ensure the quality and safety of the bridge.

1, Quebec Bridge

Cause of the accident: insufficient design considerations, structural instability

The Quebec Bridge, located on the St. Lawrence River in Canada, was supposed to be a truly valuable and enduring masterpiece by the famous designer Theodore Cooper. As the longest span steel cantilever bridge in the world at the time, Cooper forgot to extend the main span of the bridge from 490 meters to 550 meters, thus saving the cost of building the pier foundation.

However, just as the bridge is about to be completed, the tragedy has taken place. On August 29, 1907, the bridge rods were unstable and suddenly collapsed. 19,000 tons of steel and 86 bridge workers fell into the water, and only 11 were still alive. Due to Coppa's overconfidence, the accurate calculation of the weight of the bridge was neglected, resulting in an accident.

  
In 1913, the construction of the bridge began again, but unfortunately the tragedy happened again. In September 1916, the longest span of the bridge spanned and collapsed during the lift. As a result, 13 workers were killed. The cause of the accident was caused by the fact that the material indicators of a support point were not in place during the lifting process.

In 1917, after two tragic tragedies, the Quebec Bridge was finally completed and opened to traffic. This bridge is still the longest cantilever span bridge in the world.

2, Tacoma Narrows Bridge

Cause of accident: limited theoretical knowledge, wind damage

The Tacoma Strait Bridge is located in the Tacoma Strait, Washington State, USA. The first Tacoma Strait Bridge was built between November 1938 and July 1940, with a mid-span 853m. In the final stage of construction, people found that the bridge would be shaken or even distorted under the breeze. When the driver was driving on the bridge, he could see the other side of the car disappearing with the bridge surface for a while. .

 
On November 7, 1940, the bridge experienced strong wind-induced vibration at a wind speed of 19 m/s (equivalent to eight-level wind) far below the design wind speed. The bridge deck experienced an anti-symmetric torsional vibration with an increasing amplitude of 70 min, which eventually led to The bridge deck fell and fell into the canyon.