粘弹性阻尼材料减振技术及其在桥梁中的应用

Vibration-suppression Technology of Visco-elastic Damping Materials and Its Application to Bridges

粘弹性阻尼材料作为一种高分子聚合物材料 ,同时具有粘性液体和弹性固体的性质 ,具有耗能减振作用。随着环境温度的升高和变形频率的减小 ,粘弹性阻尼材料的贮能剪切模量和损耗因子减小。应变幅值的变化对粘弹性阻尼材料的力学性能无显著影响。当应变幅值较小时 ,加载循环次数对粘弹性材料动力特性的影响较小。阐述了许多学者对粘弹性阻尼器的应力 应变关系提出的计算模型。粘弹性阻尼器通过改变桥梁结构的频率和阻尼比来达到减振目的。通过在上承式钢板梁上的工程实践应用 。

The visco-elastic damping materials (VDM) h ave the function of dissipating energy and reducing vibration, which is a type o f high polymer material featuring viscous liquid and elastic solid simultaneousl y. The shear storage modulus and loss factor of VDM will decrease with the ascen dance of ambient temperature and the decrease of frequency. The influence on VDM 's dynamic characteristics of load cycles is small relatively. The calculation m odel of visco-elastic damper stress-strain relation posed by some scholars is discussed. The visco-elastic damper reduces the dynamic amplitude of bridge str ucture through change the frequency and damper ratio. The engineering applicatio n on a deck steel plate girder proves that the vibration of bridge structure wit h added visco-elastic damper could be suppressed.