The Response Of The Horizontal Rotating Beam With Long Cantilever Caused By Train-induced Vibration

With the development of social economy and transportation, bridges are more and more used to cross other traffic lines such as railways and highways. China is a country with heavy traffic, where rotary erection method is used more and more in in order not to affect the traffic line under bridges during their construction. However, the traffic under the bridge must be stopped in most of the rotating constructions. If the bridge can rotate without stopping the traffic, the adverse effects will decrease. So it is necessary to analyze the rotating beam's response caused by the train-induced ground vibration and the results can provide reference in later rotary erection construction of bridge without stopping the traffic.First, this paper introduces the application and development of rotary erection method, and elaborates several methods of bridge's dynamic analysis. The vibration of the rotating beam caused by the train-induced vibration is analyzed and the method of seismic analysis is used in rotary erection construction without stopping the traffic for the first time. The paper introduces the test methods of train-induced ground vibration, unbalanced force test of the rotating beam and vibration of the beam, and then analyzes the experimental results. Midas is used to take the time history analysis of the bridge's vibration response and the results are compared with the experimental data to do feasibility analysis without stopping the traffic under the bridge. It is shown that it is feasible to rotate the beam without stopping the traffic under the bridge. The analysis result of this paper can provide a basis to the vibration stability of horizontal rotating bridges with long cantilever under the action of train-induced vibration.There are 46 figures,19 tables and 53 references literature.