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斜拉索在端部激励下将发生空间耦合振动.为探究不同端部激励下斜拉索空间耦合振动的特性,利用斜拉索非线性振动运动方程,采用数值方法研究了在第一、二主共振区,上端水平面内激励、下端竖向激励和下端面外激励三种常见情形下斜拉索的空间耦合振动响应.研究表明:因上端水平面内激励和下端竖向激励均是面内激励,对斜拉索空间耦合振动的影响具有相似性;重力的影响使斜拉索面内、外运动方程不同,从而导致斜拉索在面外激励下(下端面外激励)与面内激励下(上端水平面内激励及下端竖向激励)的空间耦合振动特性具有本质区别.
In order to explore the characteristics of space coupling vibration of stay cables under different end excitations, by using the nonlinear vibration equation of stay cables, The main resonance region, the upper horizontal plane in-plane excitation, the lower-end vertical excitation and the lower-end external excitation, the results show that both the in-plane excitation and the down-end vertical excitation are in-plane excitation , Which have similar effects on the space coupling vibration of diagonal cables. The influence of gravity on the diagonal cables causes different in-plane and out-going motion equations, which leads to the failure of the stay cables under the out-of-plane excitation (Upper horizontal plane excitation and lower vertical excitation) of the space coupling vibration characteristics are essentially different.