Analysis Of Mechanical Behavior Of Extradosed Cable-stayed Bridge With Corrugated Steel Webs

With the rapid development of China’s long-span bridges, extradosed cable-stayedbridge with prestress concrete composite box girder with corrugated steel webs as a new formof bridge structure has been widely used. This kind of bridge structure has light weight, lowconstruction cost, short construction period and good seismic performance and manyadvantages. With the basis of Sunwu Yellow River Bridge and the previous research aboutthe extradosed cable-stayed bridge with corrugated steel webs, the dissertation presentedsystematical study of static and dynamic performance, the overall stability of structures andthe buckling strength calculations of the corrugated steel webs. The main works involved inthis research are as follows.First of all, the structural features and mechanical characteristics of extradosedcable-stayed bridge with corrugated steel webs were introduced, as well as the research statusof the static and dynamic performance, including the stable performance were presented.Using the finite element analysis to do mechanic behavior research in construction,finished bridge and operation stages. The bridge without cable was calculated to compare theinternal force change between the main beam and the cable. The results verified that theforces of the bridge were in accordance with the static property of the extradosedcable-stayed bridge.Using the finite element analysis to calculate the dynamical behavior of extradosedcable-stayed bridge and the continuous girder bridge, besides, the spectrum analysis wasadopted to analyze the seismic response. It can be applied to the seismic concept design of theextradosed cable-stayed bridge.Finally, using the finite element analysis to calculate the overall stability analysis of theextradosed cable-stayed bridge, and the empirical formula were used to calculate the shearbuckling analysis of the corrugated steel webs.Calculation results presented in this paper showed that the extradosed cable-stayedbridge with prestress concrete composite box girder with corrugated steel webs was ofenough stability. Any form of instability will not occur.