Analysis Of A Single Hybrid Tower Cable-Stayed Bridge With Concrete Box Girder And Detailed Analysis Of Its Hybrid Segment On Pylon

Firstly, a brief introduction about single tower cable-stayed bridge and hybrid tower was given. Secondly, taking a single tower cable-stayed bridge with a span of 130+130m as project background, a scheme design of a single hybrid tower cable-stayed bridge with concrete box girder was proposed, and then the concrete box girder, the hybrid tower and the stay cable of this bridge were designed. By using a professional bridge analysis software MIDAS/CIVIL 2012, a finite element model of the entire bridge which based on beam elements was established. Effects of the bridge were analyzed in detail under dead load, live load, system temperature change, girder temperature gradient and wind load in operation by using this model. Stresses and displacements of the bridge were checked according to the most unfavorable load combination. Thirdly, free vibration characteristics of the bridge were analyzed. The response spectrum method and time-history method were applied to study the seismic response of the bridge. Finally, an integrated finite element model of the entire bridge was established by using finite element universal software ANSYS 14.0, including solid elements, shell elements and link elements. The stress of steel reinforcement, concrete bars and steel perforated plates under the dead load, combination of dead load and lane load, and combination of dead load and checking load was calculated and analyzed. The mechanical properties of steel reinforcing bars and steel perforated plates with three different diameters were compared. Some suggestions of optimization of the hybrid segment on pylon were given.