Xinhua News Agency, Guangzhou, May 6 (Reporters Tian Jianchuan, Mao Xin) Guangdong Transportation Group reported in the early morning of the 6th that the expert group judged that the Humen Bridge had a vortex vibration of the bridge on the 5th, and believed that the suspension bridge structure was safe and reliable. It will affect the safety and durability of Humen Bridge's subsequent use. In the early morning of the 6th, the reporter saw in the real-time monitoring screen of the Humen Bridge Management Center that the bridge still had slight vibrations visible to the naked eye.
The Humen Bridge is a sea-crossing bridge connecting Nansha District of Guangzhou City and Humen Town of Dongguan City. It is located on the Lion River in the Pearl River Estuary and was opened to traffic in 1997. The traffic volume of the Humen Bridge is large, and it is often saturated.
The Guangdong Provincial Transportation Group reported that 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 and the traffic police department adopted two-way traffic control measures in a timely manner. The Guangdong Provincial Department of Transportation and Guangdong Provincial Transportation Group organized 12 well-known bridge experts in China to hold a special video conference to conduct research and judgment.
The expert group preliminarily judged that the main reason for this vibration of the suspension bridge of the Humen Bridge is: the continuous installation of water horses along the side rails of the bridge has changed the aerodynamic shape of the steel box girder, and under certain wind conditions, the bridge vortex vibration has occurred.
Guangdong Provincial Transportation Group reported that the large-span suspension bridge has vortex vibration at low wind speeds, and the amplitude of vibration is small. It is difficult to detect the vibration amplitude. It will only produce larger amplitude under special conditions, which will not affect the safety of the bridge structure and will affect the driving experience. , Comfort, easy to induce traffic safety accidents.
At present, the Humen Bridge maintenance unit has urgently started a comprehensive inspection and testing of the bridge, and the bridge continues to implement two-way closure. The Ministry of Transport has established an expert working group to guide on site.