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考虑悬浮隧道锚索的垂度,导出了锚索在轴向激励作用下的非线性振动方程,并采用伽辽金法和龙格-库塔法对典型悬浮隧道锚索进行了数值求解。研究表明,锚索的参数振动响应与水体的阻尼力,锚索的垂度,索端激励大小有关;锚索的内外直径比应综合各种因素进行选取;不考虑锚索垂度的计算结果较考虑垂度的计算结果小;由于水体阻尼力的作用,悬浮隧道锚索的参数振动响应比空气中锚索的参数振动响应减小。
Taking the dip of suspension tunnel as an example, the nonlinear vibration equation of cable under axial excitation is deduced. The Galerkin method and Runge-Kutta method are used to solve the typical suspended tunnel anchor cable. The results show that the vibration response of the anchor cable is related to the damping force of the water body, the dip of the anchor rope and the size of the stimulation at the rope end. The internal to external diameter ratio of the anchor rope should be selected according to various factors. Compared with the calculation result of sag considering the sag, the vibration response of the suspension tunnel anchor cable is lower than the vibration response of the anchor rod in air due to the damping force of water body.