为研究在索端参数激励作用下考虑锚索松弛效应的水中悬浮隧道振动响应，建立了锚索的参数振动方程，并采用伽辽金法对其进行化简，在此基础上分析了是否考虑锚索松弛两种情况下锚索的跨中位移和轴向张力响应。计算结果表明，锚索较易出现松驰情况，其对隧道振动响应的影响不可忽略，松弛出现与否与轴向激励幅值有关；考虑锚索松弛时，在整个张力时程范围内，锚索轴向张力小于零的时间非常短；是否考虑松弛对锚索的最大正向、负向位移均有影响。%To study the response of submerged floating tunnel subjected to parametric excitation considering tether loosening, the parametric vibration equation of tether is set up and simplified by Galerkin method. The span middle point displacement and axial tension of the tethers are analyzed in the conditions of whether tether loosening is considered or not. The results show that, the tether is prone to loosen due to the amplitude of axial excitation and the influences on vibration of the tunnel is obvious; if tether loosening is taken into account, the duration that the axial tension of tether less than zero is very short compared with the whole axial tension time history;whether considering loosening or not has a certain influence on maximum positive and negative displacement of the tether.
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