黏弹性阻尼器是一种被动减震（振）控制装置，它主要依靠黏弹性阻尼材料的滞回耗能特性，给结构提供附加刚度和阻尼，以减小结构的震（振）动反应。在减震结构设计中，一定范围内提高黏弹性阻尼器的存储刚度，能够有效的降低结构的震（振）动位移，提升黏弹性阻尼器的减震性能；通过在既有黏弹性阻尼材料中增加芳纶网眼织物，设计并制作了五类黏弹性叠层复合材料阻尼器，在相同环境温度下，对其进行变形相关性、加载频率相关性以及疲劳性能试验，以最大剪应力、存储剪切模量、损耗剪切模量和等效黏滞阻尼比作为性能指标，研究黏弹性叠层复合材料阻尼器的力学性能及其规律。研究结果表明：在不改变黏弹性阻尼材料基体的基础上，增加芳纶网眼骨架材料，能够有效的提高黏弹性阻尼器的存储刚度；剪切变形、疲劳加载对黏弹性叠层复合材料阻尼器力学性能指标影响明显；加载频率对该类黏弹性阻尼器的力学指标影响较小。
Abstract
A viscoelastic damper is a passive damping control device, which mainly relies on the hysteretic energy dissipation characteristics of viscoelastic material to provide additional stiffness and damping to the structure to reduce the seismic dynamic response of the structure.In the passive control structure design, the storage stiffness of the viscoelastic damper is improved within a certain range, which can effectively reduce the seismic dynamic response of the structure and improve the passive control performance of the viscoelastic damper.This paper presents an experimental study on five types of viscoelastic laminated composite dampers fabricated by adding aramid mesh skeleton material to viscoelastic modified natural rubber.The maximum shear stress, storage shear modulus, loss shear modulus, and equivalent viscous damping ration were measured under different loading schemes to study the regularity of the viscoelastic laminated composite damper properties.The influence of the strain amplitudes, loading frequency, and fatigue to the mechanical properties of these viscoelastic laminated composite dampers were studied.The conclusion is that without changing the matrix of viscoelastic damping material, the storage stiffness of damper can be improved with adding aramid mesh skeleton material in it.Shear strain and fatigue have more effect on the mechanical properties of the viscoelastic laminated composite dampers than loading frequency.
关键词
黏弹性阻尼器 /
叠层复合材料 /
力学性能 /
存储刚度 /
等效黏滞阻尼比
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Key words
viscoelastic damper /
laminated composite /
mechanical property /
storage stiffness /
equivalent viscous damping ratio
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