周期性结构复合材料减振性状与工程应用前景

Vibration attenuation and application of composition materials of periodic structures

土木工程结构的传统减振控制技术通过降低材料的刚度和增加阻尼的方法,所用材料多为橡胶类产品,橡胶产品因使用寿命的限制,又不便更换,其后续减振效果显著下降。基于周期性结构复合材料的振动传播特性,通过室内试验验证了周期性结构复合材料的带隙特征,通过建立的地铁周期性结构复合道床理论模型进行计算,验证了一种新型周期性结构高分子混凝土道床的减振效果。这为工程结构的长效减振与应用提供了新的技术途径。

In order to isolate vibration,the conventional attenuation method is to decease the stiffness and to increase the damp in the civil engineering structures.But those materials are almost rubber products.However,the rubber products will be easy to degenerate and not be conveniently exchanged because their service life is limited,and the durability of isolation of the rubber products will be obviously affected.The propagation characteristics of elastic wave in composite materials are introduced.Their band gap periodic structures are validated by laboratory tests.The model of metro bed of the composite materials of periodic structures is derived by the theoretical method.The laboratory and calculated results demonstrate that the new type high polymer concrete metro bed material has obviously attenuation features for the real metro vibration signal as inputting signal.This study will provide the theoretical foundation and new technology path for long-term vibration attenuation of engineering structures.