城市快速路路面约束阻尼结构阻尼性能研究

Experimental research on damping performance of constraint damping structures in urban expressway

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。

The urban expressway model was set up, and road restraint damping structures were designed. Through the single beam excitation test of free beam, the influence of the thickness of damping layer on such damping factors as composite loss factor and total vibration grade of the road restraint damping structure were discussed, and then the thickness of damping layer was optimized. The experimental results show that ： When the thickness of the damping layer increases to 1, 1.5, 2 ,and 3mm, the vibration acceleration of the structure decreases by 30%, 65%, 70% and 65% ,and the second order composite loss factor of structure increases by 2.2%, 6.5%, 57.1%, 11% each. With the increase of the thickness, the damping effect of the road restraint damping structure improves first and then debases , and the optimum was achieved in the 2mm,while the total vibration value hitting the minimum 135.95 dB, and the second order composite loss factor the maximum 0. 143.