Why does Humen Bridge in Guangdong shake abnormally? Structural safety of humen bridge.

1. According to the preliminary judgment of the expert group, the main reason for this vibration of Humen Bridge suspension bridge is that the aerodynamic shape of the steel box girder has been changed due to the continuous installation of water horses along the guardrail across the bridge, and the bridge vortex vibration has occurred under specific wind environment conditions.

2. Experts have another guess, which is related to the "damping ratio" of the bridge. Generally speaking, "damping ratio" is similar to virus antibody, which represents its ability to resist bridge vibration. The smaller the damping ratio, the lower the seismic capacity of the bridge. Humen bridge has existed for 25 years, and the damping ratio may become smaller, which will affect the anti-vortex vibration ability.

3. Structural safety of Humen Bridge: Recently, domestic bridges seem to be a bit "floating". On April 26th, the bridge body of Wuhan Yingwuzhou Yangtze River Bridge swayed in the waves. Nine days later, a similar wave of "God Shake" came to the suspension bridge of Humen Bridge in Guangdong, which made the bridge "float" on the hot search.

4. The fluctuation "blockbuster" of Humen Bridge in the vibrato video is really scary. However, experts say that although the bridge "floats" obviously, it is still safe.

5. Regarding the "flutter" of bridges, Zhengqing Chen, an academician of China Academy of Engineering, thinks that it can be divided into "dynamic" and "static" angles. When designing a bridge, the bearing capacity of the structure will be considered, that is, the maximum settlement of the bridge when it is fully loaded. It is estimated that the maximum subsidence of Humen Bridge is 2m, and the "floating" range of this bridge is about 0.5m.. From this static concept, the bridge is very safe.