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模拟城市快速路,设计路面约束阻尼结构。通过自由梁单点激振试验,探讨了阻尼层厚度对路面约束阻尼结构的复合损耗因子、振动总级值等阻尼性能的影响规律,并确定最优阻尼层厚度。试验结果表明:相比无阻尼结构,当阻尼层厚度取1、1.5、2、3 mm时,结构的振动加速度分别降低30%、65%、70%、65%,而结构的第2阶复合损耗因子分别增加2.2%、6.5%、57.1%、11%;随着阻尼层厚度的增加,路面约束阻尼结构的阻尼性先增加后减小,并在2mm达到最优,此时振动总级值达到最小值135.95d B,2阶复合损耗因子达到最大值0.143。
Simulate urban expressway and design pavement damping structure. Through the single-point vibration test of free beam, the effect of damping layer thickness on the damping capacity, the total vibration level and other damping properties of pavement damping structure was discussed, and the optimal damping layer thickness was determined. The experimental results show that the vibration acceleration of the structure decreases by 30%, 65%, 70% and 65% respectively when the thickness of the damping layer is taken as 1, 1.5, 2 and 3 mm compared with the un-damped structure. The second- The dissipation factor increases by 2.2%, 6.5%, 57.1% and 11% respectively. With the increase of the thickness of the damping layer, the damping of the pavement damping and damping structure first increases and then decreases and reaches the optimal value at 2mm. At this time, the total vibration level Reaching the minimum value of 135.95d B, the second-order composite loss factor reached a maximum value of 0.143.