Abnormal shaking time exceeds 20 hours. How will Humen Bridge be solved?

Although the vibration amplitude of Humen Bridge is obviously greater than the deck jitter of Wuhan Yingwuzhou Yangtze River Bridge at the end of April. However, bridge experts attributed the vibration of Humen Bridge to water horses and wind conditions. After all the water horses on the bridge were removed, the deck vibration continued to appear on the 6th, but it was not as violent as what everyone saw in the video for the first time.

So, many people care about Humen Bridge? Secondary abnormal jitter? What's going on here? If it has nothing to do with the first time, how to solve the Humen Bridge next? Up to now, although the Humen Bridge has continuously implemented two-way traffic control, the abnormal vibration of the deck has basically subsided, and from the professional inspection of the overall structure of the bridge by experts, it has not been affected by this abnormal vibration event.

Of course, due to the slight abnormal shaking of Humen Bridge on the 6th, many people will inevitably have doubts about the judgment results given by bridge experts at the first time. Therefore, in order to eliminate everyone's panic, the deputy chief engineer of Humen Bridge explained: The reason why Humen Bridge will reappear in a small range of abnormal jitter in a short time without interruption after the first violent vibration is mainly due to the dual effects of inertia and wind, and energy consumption takes some time.

In other words, when the bridge structure of Humen Bridge vibrates greatly, the bridge itself needs enough time to consume all the energy generated in the process. Moreover, bridge experts said: It is certain that although the abnormal vibration will take some time to ease and disappear, this series of abnormal phenomena caused by bridge vortex vibration will not pose a threat to the safety of bridge structure.

Now, as we all know, it is not the first time that the bridge has experienced abnormal vibration recently. Moreover, the abnormal vibration of Wuhan Yingwuzhou Yangtze River Bridge was also caused by specific wind conditions, but bridge experts said at that time that the fluctuation range of the bridge was still within the allowable range of bridge design, and this situation did not continue in the following time, so the bridge has been restored to traffic.

In fact, after the great vibration of Humen Bridge occurred on the afternoon of May 5th, 12 bridge experts evaluated whether the abnormal vibration would affect the safe passage of the bridge that night, and announced in the early morning of the next day that the deck fluctuation of Humen Bridge suspension bridge was mainly due to the change of the aerodynamic shape of the steel box girder caused by the continuous arrangement of water horses along the bridge under the action of wind, so the violent vibration that everyone saw in the video appeared, which is the so-called bridge in the professional terminology of experts.

In fact, many people are afraid of the abnormal vibration of bridges. On the one hand, they are worried that their life safety cannot be guaranteed. On the other hand, they don't know why the bridge is shaking like this. Therefore, for most of us who don't know anything about bridge construction, it is easy to confuse the bridge deck vortex vibration in the mouth of experts with what we think is flutter. However, in fact, we can simply and directly distinguish between vortex vibration and flutter from their definitions.

Simply put, the vortex-induced vibration of bridges cannot be separated from the wind. Generally, this kind of bridge has a long span, and the vortex-induced vibration of the bridge is actually one of the wind-induced vibration phenomena. However, flutter, as one of the important problems in aerodynamics, is different. The occurrence of this phenomenon is not directly related to the wind. It means that as long as the structure is elastic, it is called flutter when it is coupled by air or liquid power, inertia force and elastic force.

Of course, a large bridge like Humen Bridge does have the conditions for flutter or vortex-induced vibration, but their effects are completely different. Vortex-induced vibration affects the comfort of vehicles passing on the bridge deck, while flutter endangers the main safety of the bridge. Although maintaining vortex-induced vibration for a long time may lead to bridge fatigue, as far as the current situation is concerned, Humen Bridge as a whole has become calm. At present, the exact opening time has not been announced, mainly for further comprehensive inspection of the bridge, so don't worry too much.