Abstract
The synchronous construction method of tower and beam can greatly shorten the construction period of cable-stayed bridge, but the force condition is complicated. The overall stability of the bridge which use synchronous construction method should be studied further. Based on the Dingzihekou Bridge project, a finite element analysis model was established and three typical construction conditions were selected by using Midas Civil software. Linear stability analysis and geometric non-linear stability analysis about the construction period of the Dingzihekou Bridge were conducted. The stability factors of the two construction schemes and the modes of the linear instability failure in the construction periods of the cable-stayed bridgeare inferred. It is found that the geometrically non-linear stability safety factor is significantly less than the linear. There is no big difference in linear stability factor between synchronous construction and asynchronous construction of tower and beam. As for the geometric nonlinear stability analysis, the synchronous construction of tower and beam has a larger stable safety factor than asynchronous construction.
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