Influence Of Cyclones To Bridge Security And Its Countermeasure Researches

It is reported that the disaster caused by wind is one of the most common and serious nature disasters. Many countries in the world suffer from typhoon disaster, especially for China due to his particular location:facing the Pacific on the east and the largest source of typhoon on the earth. The normal operation of land transportation facilities is threated by strong wind as well. Accidents about bridge damages can be seen on TV and newspapers frequently. The northern desert area is in a circumstance which more than half a year blows 8 or heavier gale. Contribution of wind-sand disaster to bridge damages should not be ignored. Therefore, more and more scientists all over the world pay much attention to the survey of cyclones.In this thesis, cyclone is divided into the following three classes based on its characteristic and the interaction with surrounding environment, namely:gale, stormy waves and wind sand. According to the formation conditions and failure mechanism to structures of each kind of disaster, this thesis analyzes different bridge damage patterns caused by the former three kinds cyclones, making it clear that each of them functions. Then, targeted measures are put forward to mitigated or even avoid bridge damages.At the same time, subject to a good knowledge of cyclone prediction connotation, this thesis elaborates methods to monitor cyclones, finding out shortages of the existing cyclone prediction system, learning experience from similar overseas disaster prediction cases, to consummate Chinese own cyclone prediction system.In addition, details of the construction of comprehensive preventive system are discussed.Bridges play an important role in traffic hub. Whether the rescue teams and supplies can be sent into disaster areas immediately or not relies on the efficiency of bridge emergency repair. As a result, this thesis introduces a few practical ways to repair damaged bridges quickly after analyzing the bridge damage patterns caused by cyclones.At last, the problems requiring further studies are discussed.