Abstract
In order to study the influence of boundary conditions at the bottom of the tower on the structural characteristics of a ground anchored cable-stayed bridge with single inclined tower, taking a bridge project as an example, the finite element model is established to study the static, dynamic and overall stability of three structural systems, namely, universal hinge connection, unidirectional hinge connection and consolidation connection, between the bridge tower and the concrete tower base. The results show that: The internal force can be reduced by universal hinge connection between tower bridge and tower base, and structural deformation can be reduced by choosing consolidation method. However, there will be huge torque and transverse bending moment at the bottom of tower, so the consolidation system should not be selected first; the dynamic characteristics of the three systems are different, but the dynamic characteristics of the main girder are basically the same. In terms of stability, the boundary conditions have little effect on the low-order instability modes of the structure, and the stability can be considered as the final factor of the structure selection.
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