We analyze the advantages and disadvantages of the cable-stayed-continuous beam combination system, by comparisons of the natural vibration characteristics and the responses under dead and live loads of double-pylon cable-stayed-continuous beam combination system, double-pylon cable-stayed-simply-supported beam combination system and common double-pylon cable-stayed bridge system. The results show that cable-stayed-continuous beam combination system has the greatest stiffness, a structure with the least deformation, and side calbles with the least probability of failing by fatigue. While the cross section of the main girder at the top of the auxiliary pier has an excessively big negative moments under the dead and live loads, thus the specific redesign is required. Compared with cable-stayed-single-supported beam combination system, cable-stayed-continuous beam combination system has a higher natural frequency, a stronger stiffness of the whole structure, and a better mechanical performance, but it is more susceptible to dynamical effects such as earthquake.
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