Humen Bridge is still in a state of vibration, experts say it may be affected by wind and inertia

　　China News Service, Guangzhou, May 6th (Cai Minjie) An unusual jitter event occurred on the Humen Bridge, which aroused public attention. Zhang Xinmin, deputy chief engineer of Humen Bridge, said on the 6th that the current vortex vibration has no impact on the structural safety of the bridge.

　　In the afternoon of the same day, a dozen bridge experts conducted test and evaluation work on the Humen Bridge. From the scene of the Humen Bridge Management Center, the "Main Bridge Jitter Record" shows that from 15:28 on the 5th, the main bridge of the Humen Bridge has been shaking, but the magnitude of the shaking is different. At 15:45, the reporter saw that the amplitude of the bridge's jitter became weaker in the management center, and it was not easy to detect the jitter with the naked eye, but at 16:10, the bridge began to shake with a stronger amplitude.

　　On-site staff said that the bridge has always been shaking, but the magnitude of the shaking is strong. For example, the amplitude of the shaking increased from 8:35 to 12:20 on the 6th, but it has weakened since 12:20.

　　Zhang Xinmin said that due to the influence of wind and inertia, a structure will not stop immediately after vibration, but the energy consumption can eventually be eliminated. At present, vortex vibration has no effect on the structural safety of the bridge.

　　The Humen Bridge is a cross-sea bridge connecting Nansha District of Guangzhou City and Humen Town of Dongguan City in Guangdong Province. It connects the two sides of the Pearl River and communicates with important cities such as Shenzhen and Zhuhai. It is an important transportation hub in coastal areas of Guangdong. The Humen Bridge started construction in 1992 and was opened to traffic in 1997.

　　Since August last year, due to the long-term overload operation of the Humen Bridge, the bridge suspension bridge, the auxiliary approach bridge east approach bridge, the Taiping Bridge, the Guangji No. 2 bridge, the Dayong Bridge and the Shenwan Bridge have different degrees of disease. Therefore, controlled maintenance is implemented, and trucks and passenger cars with more than 40 seats are prohibited from passing through the Humen Bridge throughout the day.

　　According to Zhang Xinmin, according to the experience at home and abroad, generally large bridges will undergo operation and maintenance after 20 years.

　　On the 5th, the Humen Bridge was abnormally shaken, the suspension bridge deck swayed relatively large, and the amplitude was relatively obvious, which caused discomfort to the traffic. In order to ensure traffic safety, Guangzhou and Dongguan traffic police have taken traffic control measures on that day and closed the two-way traffic of the suspension bridge. On the 6th, Guangdong Provincial Communications Group stated that according to the preliminary judgment of the expert group, the main reason for the vibration of the suspension bridge of Humen Bridge is that the continuous installation of water horses along the span of the bridge changes the aerodynamic shape of the steel box girder under certain wind conditions. , The phenomenon of bridge vortex vibration.

　　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. (Finish)