Static Elastic Stability of East Hubei Yangtze River Bridge during Construction

Applied the research method and finite element implementation of static elastic stability,the LSB model and ANSYS model of East Hubei Yangtze River Cable-stayed Bridge,which has a long-span hybrid girder,asymmetric side spans and middle span,were built to analyze the stability during construction.The calculation result of elastic stability safety coefficient was compared with the standard value.The result shows that(1) the elastic stability safety factor of steel box girder cantilever increased gradually,then changed smoothly,and decreased obviously at last during construction,it fluctuated obviously during construction of each segment of steel box girder;(2) the safety factor did not fluctuated apparently,and the bridge has relatively constant load bearing capacity after completion and during operation;(3) pylon longitudinal instability and steel box girder vertical instability mode occurred during construction.