| 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，研究了橡胶自密实混凝土的动态力学性能及其阻尼提升机理，采用环境振动预测模型分析了橡胶自密实混凝土填充层结构的减振性能.结果表明：橡胶降低了自密实混凝土的动态弹性模量和动态剪切模量，导致其泊松比增大，阻尼比随着橡胶掺量的增大线性增加；橡胶加大了基体对应力波能量的消耗，提高了自密实混凝土的阻尼性能；橡胶自密实混凝土填充层结构在1~200 Hz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20 Hz以下的低频振动降低了3~5 dB左右. |
| 关键词: 阻尼 橡胶自密实混凝土 填充层 减振性能 低频振动 |
| DOI：10.3969/j.issn.1007-9629.2023.04.003 |
| 分类号:TU528.41 |
| 基金项目:国家自然科学基金资助项目（52078490，11790283） |
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| Vibration Reduction Performance of Rubber Self-compacting Concrete Filling Layer Structure |
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CHEN Junhao1, ZENG Xiaohui1, XIE Youjun1, LONG Guangcheng1, LIU Jinhui2
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1.School of Civil Engineering， Central South University， Changsha 410000， China;2.Shenzhen Metro Group Co.， Ltd.， Shenzhen 518026， China
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| Abstract: |
| Based on the concept of damping energy dissipation， a new type of vibration-damping measure i.e. the rubber self-compacting concrete filling layer structure was proposed. The dynamic mechanical properties of rubber self-compacting concrete were studied and the damping enhancement mechanism was suggested. The vibration reduction performance of rubber self-compacting concrete filling layer structure was analyzed by using an environmental vibration prediction model. The results show that the rubber reduces the dynamic elastic modulus and dynamic shear modulus of self-compacting concrete， resulting in an increase in Poisson's ratio. The damping ratio increases linearly with the rubber content. The rubber increases 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 1-200 Hz is lower than that of the ordinary self-compacting concrete filling layer structure， and for low-frequency vibration below 20 Hz， the reduction is about 3-5 dB. |
| Key words: damping rubber self-compacting concrete filling layer vibration reduction performance low frequency vibration |
