定点锤击及现场列车作用下浮筑隔振效果对比试验及预测方法研究

通过现场及线下试验，测试了整体浮筑隔振措施在实际列车激励与定点锤击激励下的振动响应，分析了2种荷载激励下隔振效果的差异，并对定点锤击激励的有效性和准确性进行评价。结果表明:列车及定点锤击荷载激励下，浮筑隔振可显著减小振动加速度响应；两种荷载激励下，浮筑隔振体系的特征峰值和各频段能量分布走势相近。锤击激励下的计权Z振级隔振量略低于列车激励，其隔振效果偏于保守，可见，针对浮筑隔振系统的效果评价，实际列车激励方式要优于定点锤击激励方式。结合理论及试验分析，提出针对受振体柔性支撑浮筑隔振体系的隔振效果预测方法，可为类似隔振措施的评估和比选提供参考。

COMPARATIVE TEST AND PREDICTION METHOD STUDY ON VIBRATION ISOLATION EFFECT OF FLOATING SLAB UNDER FIXED-POINT HAMMERING AND ON-SITE TRAIN

Through field and off-line tests, the vibration responses of the integral floating vibration isolation measures under the train excitation and fixed-point hammering excitation were tested, the differences of vibration isolation effects under the two kinds of load excitations were analyzed, and the effectiveness and accuracy of fixed-point hammering excitation was evaluated. The study results showed that: under the train and fixed-point hammering excitations, the vibration acceleration response of the floating isolation system could be significantly reduced. The characteristic peak value and energy distribution trend of the floating vibration isolation system under the two kinds of load excitations were similar. The vibration isolation quantity of weighted Z-Level under a hammering excitation was lower than that under a train excitation, and its vibration isolation effect was conservative. It could be seen that the actual train incentive mode is better than the fixed-point hammering incentive mode. A prediction method of vibration isolation effect for a flexible supported floating vibration isolation system was proposed, combined with the theoretical and experimental analysis, which can provide a reference for the evaluation and comparison of similar vibration isolation measures.