Analysis Of Stability And Dynamic Characteristics For High Pier-long Span Continual Rigid Frame Bend Bridge

At the past 30 years,from the United States San Fernando earthquake in 1971 to 2013 China earthquake Badong,bridge construction has been the most serious earthquake damage of structure.In reaction to the phenomenon,experts launched many new research and discussion about the study of bridge power issue.But most of the studies are about static characteristics,And much research target is priority to straight bridge,but less to dynamic characteristics investigations.Research depth is shallow either.But in actual construction,a lot of Bridges with high piers, curved beam, pier even high up to hundreds of meters or more,and high piers and characteristics of power can amplify effect,so the research on its dynamic characteristics of curve bridge is also very necessary.In addition, there’s many stability problems in the bridge engineering structure, including high piers stability is a need to focus on the category,especially with the development of science and technology, all kinds of high strength material is widely used in engineering,the size of the structures become relatively thin.This allows structural stability problems in the limelight, making it become the control factor of structure design. Through the calculation and analysis of dynamic characteristics and stability characteristics, we can get the frequency of the structure at various stages,frequency, vibration modes of the structure and buckling eigenvalue,This enables us known the stiffness of the structure of the bridge size and stiffness distribution more.This provides a convenient conditions about judging vulnerable parts of the bridge.It can also optimize the instruction design of bridge structure adjustment,and achieved the purpose of provides the technical basis for the bridge design.Summarize these issues and expand research,combined with the related research status at present stage, this article make detailed work is as follows:(1) Elaborated the development of High Pier-long Span Continual Rigid Frame Bend Bridge and the trend of the development of bridge and the category of rigid bridge’s development. According to the dynamic stability problem at present,give a detailed analysis of the three cases of long span bridge, high pier and curved bridge. Introduces the theory of linear and nonlinear stability,and the analysis of stability method and evaluation index of the problem.(2) To a building continuous rigid frame bridge-Xiniu Bridge as analysis object,study of long-span continuous rigid frame curved bridge with high-rise piers on the dynamic performance of the radius of curvature changes, analysis of natural vibration period and the vibration type of the bridge structure under the different radius of curvature In the maximum cantilever state and full bridge state.Compare the different radius of curvature on the dynamic characteristics of the bridge.Using response spectrum method with different curvature radius of the dynamic characteristics of bridge under the action of earthquake were analyzed,Useing the method of dynamic process with seismic analysis of Xiniu Bridge.Provides a theoretical basis for design optimization of the Xiniu Bridge.(3) Make the analysis of Xiniu Bridge’s stability with high pier under effect of self-respect, transverse wind load, longitudinal wind load. Stability analysis in five adverse load combinations with maximum cantilever state;On operational phase (phase) of the whole bridge stability analysis under the five kinds of unfavorable load combinations,conclusion the results of comparative analysis.(4) Summarized and the prospect of the stability and dynamic characteristics of high pier-long span continuous rigid bend bridge.