China News Service, Guangzhou, May 6 (Cai Minjie) Guangdong Transportation Group said on the 6th that according to the preliminary judgment of the expert group, the main reason for the vibration of the suspension bridge of the Humen Bridge is that the steel box is changed due to the continuous installation of water horses along the bridge's side rail The aerodynamic shape of the beam produces bridge vortex vibration under certain wind conditions.
The Humen Bridge has been temporarily closed. Photo courtesy of Guangdong Transportation Group
The expert group said that the large-span suspension bridge has vortex vibration at low wind speed, and the vibration amplitude is small, which is not easy to detect. Only under special conditions will it produce larger amplitude, which will not affect the safety of the bridge structure, and will affect the driving experience and comfort. , Easy to induce traffic safety accidents.
At 14:00 on May 5th, obvious vibration occurred on the suspension deck of the Humen Bridge. Excessive amplitude of the deck affected driving comfort and traffic safety. The bridge management department started an emergency plan and the joint traffic police department took timely two-way traffic control measures. The Guangdong Provincial Communications Department and the Provincial Communications Group organized 12 well-known bridge experts in mainland China to hold a special video conference to conduct research and judgment.
According to the existing data and analysis of observed phenomena, the structure of the suspension bridge of Humen Bridge is safe and reliable, and the vibration will not affect the safety and durability of the subsequent use of the suspension bridge of Humen Bridge.
At present, the deck of the Humen Bridge has basically returned to normal. In order to ensure the safety of the bridge ’s traffic, the Humen Bridge maintenance unit has urgently started a comprehensive inspection and inspection of the bridge. At the same time, the Ministry of Transport of China has established an expert working group to guide the scene. The Humen Bridge will continue to close the two-way traffic. The relevant units are speeding up the inspection. Plan to open traffic as soon as possible. (Finish)