The Imbalance And Wind-Induced Vibration Of The Rotating Beam In Cantilever State Under Construction

As a new method of bridge construction, rotary erection method has lots of advantages and embraces a bright future in applications. It has little influence on the traffic, moves the construction site from high altitude to the sub aerial and enjoys a high technical and economical benefit with its high construction speed. So it is necessary to study the method systematically and the results can be referred to in later design.This article briefly introduces the application of rotary erection method and how it develops. The article mainly studies the testing method of unbalanced force in constructions adopting horizontal rotary method, introduces the spheric hinge rotary movement method and also proposes the deflection method and strain method to estimate the unbalanced force. Some tests are carried out on the Zhang Shi highway Bridge and the Zhang Jia Wan Bridge using the spheric hinge rotary movement method. Based on the analyzing results, the article presents how to make a comparison among those three methods.The rotating beam is in move balance state when is rotated and whole balance of system is controlled by the spheric hinge. In the effect of wind load especially the frequency of flurry is closed to the bridge's, the wind vibration of the rotating beam is necessary to analyze. In this paper, it will use the method of stochastic vibration to analyze the wind vibration of the rotating beam. Using the PSD module of ANSYS analyzes the Zhang Jia Wan Bridge in frequency domain. At last, it compares the result to the test data. Following conclusions are obtained from the result: The result of powder spectrum analysis is consistent with the test result. The finial conclusion is available to project although two results are discrepant about 40% and can offer a method to the rotating beam about wind vibration.There are 48 figure, 18 tables, and 66 references literature...