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首页> 外文期刊>International journal of steel structures >Tension Force Estimation of Extradosed Bridge Cables Oscillating Nonlinearly under Gravity Effects
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Tension Force Estimation of Extradosed Bridge Cables Oscillating Nonlinearly under Gravity Effects

机译：重力作用下非线性振动的超桥梁拉力估算

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摘要

Extradosed bridges have loose and sagged cables that are different from those used in cable-stayed bridges. The total tension force of an extradosed bridge cable estimated using the existing formulas is not accurate. Although the existing formulas are widely used in the field, they do not consider the exact deflection curve, features of nonlinear oscillation, and stretching force due to self-weight. In this study, a new method was developed to calculate the total tension force of the cable. In the new method, the total tension force of the cable includes the applied axial load and the stretching force due to self-weight. For the exact estimation of the applied axial load to the cable, the vibration of the cable was treated as a conservative nonlinear oscillation system, and a new formula was derived using the perturbation technique. The new formula was used to clearly explain the hardening effect due to the initial amplitude of the initial excitation, the presence of imaginary number of frequencies, the correlation with the stretching force due to self-weight, and the softening effect of the slenderness ratio on nonlinear natural frequency. For calculating the stretching force due to self-weight, the stretching of the cable for the static deformation was considered. A field test showed that it is necessary to add the stretching force due to self-weight to the estimated axial load for extradosed bridge cables and that the new method can be used to calculate the total tension force of loose and sagged cables.
机译：斜拉桥的电缆松弛而下垂，与斜拉桥中使用的电缆不同。使用现有公式估算的桥架电缆的总拉力不准确。尽管现有公式已在该领域中广泛使用，但它们并未考虑确切的挠曲曲线，非线性振荡的特征以及由于自重引起的拉伸力。在这项研究中，开发了一种新方法来计算电缆的总拉力。在新方法中，电缆的总张力包括施加的轴向载荷和由于自重引起的拉伸力。为了精确估计施加到电缆上的轴向载荷，将电缆的振动视为保守的非线性振荡系统，并使用微扰技术推导了新公式。使用新公式可以清楚地解释由于初始激励的初始振幅，虚数频率的存在，与自重引起的拉伸力之间的相关性以及细长比对非线性固有频率。为了计算由于自重引起的拉伸力，考虑了电缆的静态变形拉伸。现场测试表明，有必要将自重引起的拉伸力添加到超剂量桥梁电缆的估计轴向载荷中，并且该新方法可用于计算松散和下垂电缆的总拉力。

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