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目前关于斜拉桥极限跨径的研究大多数都是基于材料性能、结构形式的探讨。从拉索振动控制的角度出发,探讨了常规阻尼器优化设计理论及拉索的垂度参数与倾角参数对最大模态阻尼比的影响。研究表明随着跨径的增大,拉索的垂度效应使得一阶模态的最大阻尼比降低越来越明显,同时建立了拉索一阶模态最大模态阻尼比的折减系数的函数表达形式。最后在此基础上获得了拉索阻尼器所能提供的最大模态阻尼比折减系数随跨径变化的规律。研究表明,如果以传统阻尼器安装高度5m作为限制条件,且以拉索系统阻尼对数衰减率0.03作为控制目标,斜拉桥的极限跨径可以达到1 600m。
At present, most of the studies on the ultimate span of cable-stayed bridges are based on the discussion of material properties and structural forms. From the perspective of cable vibration control, the influence of the conventional design theory of damper and the dip parameter and dip parameter of the cable on the maximum modal damping ratio are discussed. The research shows that with the increase of span diameter, the dip effect of the cable makes the maximum damping ratio of the first-order modal decrease more obviously. At the same time, the reduction coefficient of the maximum modal damping ratio of the first- Function expression. Finally, based on this, the law of the maximum modal damping ratio reduction coefficient with the span of the cable damper can be obtained. The research shows that the limit span of cable-stayed bridge can reach 1 600 m if the traditional damper mounting height 5 m is used as the limiting condition and damping damping 0.03 is taken as the control target.