Research on the Modal Analysis and Reinforcement of Suspension Line Old Bridge

Suspension line Old bridges are rare exception in our country. Researching this kind’s old bridge is very interest to the bridge scholar. Zhejiang Yucheng bridge, located in Shengzhou of Shaoxing city, it is a typical suspension line bridge structure; it has been 150 years of history. Despite the impact of flash floods for so far, but, at present, it is still good for normal used, only local stone blocked off. Based on this old suspension line bridge, measuring the bridge size data, using the finite element software ANSYS for the modal analysis, the calculation results show that the fundamental frequency as 19.650Hz, and ten vibration modes and frequency bands can be obtained. In the end, about the reinforced methods are study, such as foreign adhesive steel and carbon fiber reinforced polymer (CFRP), pressure grouting way on the gap and so on. All of this may be help for old suspension line bridges research and reinforced.