Owing to the structural characteristics of floating-type structures, they can be effectively applied to overcome the limitation of conventional long-span bridges in deep water. Unlike cable-supported bridges with fixed towers, floating cable-supported bridges show relatively large displacements and rotations under the same load because of floating towers; moreover, the difference in the support stiffness causes differences in the behavior of the superstructures. In addition, the risk of overturning is greater than in conventional floating offshore structures because the center of gravity of the tower is located above the buoyancy center of the floater. A floating cable-supported bridge in which the tether supports the floating main tower is directly influenced by the tether arrangement, which is very important for the stability of the entire structure. In this study, according to the inclined tether arrangement, the outer diameter of the floater, and the buoyancy vertical load ratio (BVR), the static behavioral characteristics of the long-span cable-stayed bridges with floating tower are evaluated through nonlinear finite-element analysis. When the intersection of the tension line of the tether and a pivot point of the tower coincide, the tethers can no longer resist the tower’s rotation. For this reason, a large displacement occurs to equilibrate the structure, and further increases as it approaches the specific slope, even if it is not exactly the specific tether slope. The analytical model of this study indicates that, in terms of increasing the rotational stiffness of the main tower, it is advantageous to increase the floater diameter until a BVR of 1.8 is reached and to increase the axial stiffness of the tether from a BVR of 2.0 or higher.

中文翻译：

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静载作用下带浮塔的大跨度斜拉桥的静特性

由于浮式结构的结构特点，它们可以有效地克服深水中常规大跨度桥梁的局限性。与带有固定塔架的斜拉桥不同，浮动斜拉桥由于浮塔而在相同载荷下显示出相对较大的位移和旋转。此外，支撑刚度的差异导致上部结构的性能差异。另外，由于塔架的重心位于浮子的浮力中心上方，因此倾覆的风险比传统的浮式海上结构更大。系绳支撑浮动主塔的浮动电缆支撑桥直接受到系绳布置的影响，这对于整个结构的稳定性非常重要。在这项研究中，根据倾斜的系链布置，浮子的外径以及浮力垂直载荷比（BVR），通过非线性有限元法评估了带有浮塔的大跨度斜拉桥的静态行为特性。元素分析。当系绳的张力线与塔架的枢轴点的交点重合时，系绳将不再抵抗塔架的旋转。因此，会发生大位移以使结构平衡，并且即使接近特定的系绳坡度，它也会随着接近特定坡度而进一步增大。这项研究的分析模型表明，就增加主塔的旋转刚度而言，