Research On Structural Damage Identification Based On Vibration Test

With the aggravation of the bridge service life extension and highway traffic increases rapidly and tonnage, more and more bridges appear insufficient bearing force of bridge structure damage, aging, etc.. For these old bridges to a full reconstruction, not only requires a large amount of funds, closed to traffic but also the need for a longer period of time, the development of national economy and the people’s travel caused a lot of trouble, it must find a simple and effective way to the existing in the bridge detection and evaluation, found the damage and the extent of the damage, the status quo of the bridge, such as bearing capacity, residual service life and so on whether or not to meet the requirements of the relevant norms, and correct repair policy according to the different situation, timely recovery bridge bearing ability and prolong the service life of the bridge, to avoid accidents, ensure the safety of people’s lives. So it has important theoretical significance and practical value to study on damage identification of bridges.This paper relies on the highway engineering in Chengde City Management Office "highway bridge damage vibration monitoring technology research" project, the structural damage identification methods based on vibration test research. Based on the results of previous studies, study well and different failure regularity and frequency of deflection of reinforced concrete bridge degree, established the mathematical model of relation between the deflection coefficient and frequency coefficient, the high-speed bearing yak River Bridge site vibration modal test in Beijing, were analyzed using the finite element model and MIDAS establishment of the bridge damage, whether there are evaluated, and the coefficient of frequency field vibration modal testing is effective to identify the damage of bridge.