橡胶自密实混凝土填充层结构减振性能研究
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作者单位:

1.中南大学;2.深圳市地铁集团有限公司

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国家自然科学基金项目


Research on the Vibration Reduction Performance of Rubber Self-compacting Concrete Filling Layer Structure
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Affiliation:

1.Central South University;2.Shenzhen Metro Group Co., Ltd.

Fund Project:

National Natural Science Foundation of China

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    摘要:

    基于阻尼耗能理念提出了一种新型减振措施——橡胶自密实混凝土填充层结构。本文研究了橡胶自密实混凝土的动态力学性能,解释了其阻尼提升机理,采用环境振动预测模型分析了橡胶自密实混凝土充填层结构的减振性能。结果表明:橡胶降低了自密实混凝土动态弹性模量和动态剪切模量,导致泊松比增大,阻尼比随橡胶掺量呈线性增加;橡胶加大了基体对应力波能量的消耗,提高了阻尼性能;橡胶自密实混凝土填充层结构在1~200Hz频段内的加速度级均小于普通自密实混凝土填充层结构,其中20Hz以下的低频振动的降低了3-5dB左右。

    Abstract:

    Based on the concept of damping energy dissipation, this paper proposed a new type of vibration-damping measure—rubber self-compacting concrete filling layer structure. In this paper, the dynamic mechanical properties of rubber self-compacting concrete were studied, the damping enhancement mechanism was explained, and the vibration reduction performance of rubber self-compacting concrete filling layer structure was analyzed by using an environmental vibration prediction model. The results showed that the rubber reduced the dynamic elastic modulus and dynamic shear modulus of self-compacting concrete, resulting in an increase in Poisson’s ratio. The damping ratio increased linearly with the rubber content. The rubber increased the consumption of stress wave energy by the matrix, thus improving the damping performance. The acceleration level of the rubber self-compacting concrete filling layer structure in the frequency range of 1~200Hz was lower than that of the ordinary self-compacting concrete filling layer structure, and for low-frequency vibration below 20Hz, the reduction was about 3-5dB.

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  • 收稿日期:2022-03-24
  • 最后修改日期:2022-05-12
  • 录用日期:2022-05-13
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