中文摘要：

纤维的掺量、表面改性和干湿条件对混凝土材料的阻尼性能有明显的影响．首先利用自主开发的三点弯曲梁式大尺寸材料阻尼测试装置在频率（0．5～2．0Hz）条件下测定了不同纤维掺量、不同湿度条件和不同表面改性技术（硫、硝酸氧化和硅烷联偶剂硅烷化）对混凝土材料阻尼性能的影响．试验结果表明：聚丙烯腈纤维混凝土的损耗因子和损耗模量随着纤维掺量的增加而提高，但基于成本和搅拌工艺的考虑，可以认为聚丙烯腈纤维掺量0．72～o．96Kg／m3比较合适；全湿状态下混凝土的耗能能力要大于全干状态下的混凝土的耗能能力；表面改性技术可以进一步有效的提高硅粉和碳纤维混凝土的损耗因子和损耗模量，掺表面改性后硅粉的混凝土的耗能能力比掺未改性硅粉混凝土的耗能能力提高30％～65％，掺表面改性后碳纤维的混凝土的耗能能力比掺未改性碳纤维混凝土的耗能能力提高50％～65％．通过综合比较认为硅烷化是比较好的表面改性方法，并且对表面改性纤维混凝土的阻尼增强机理进行了初步探讨．

英文摘要：

Fiber content, surface treatments and humidity conditions all have obvious impact on the damping capacity of concrete. In this paper, the experimental investigation on damping capacity of hybrid fiber reinforced concrete affected by fibers content, humidity conditions and surface treatments （sulfuric acid oxidation, nitric acid oxidation silanization） was carried out by the method of 3-point bending beam damping measurement in the range of 0.5-2. 0 Hz. The results show that the loss modulus and loss tangent of polyacrylonitrile fiber reinforced concrete increased with increasing fibers content. Fiber content among 0.72-0.96 Kg/m3 was suggested according to cost and application; the damping capacity of saturated fiber reinforced concrete was better＇than the damping capacity of dry fiber reinforced concrete; and surface treatments could improve loss tangent and loss modulus of hybrid fiber reinforced concrete further. Damping capacity of concrete reinforeed by surface modified silica fume was improved by 30 % -65 % compared with the original silica fume concrete and the damping capacity of concrete reinforced by surface modified carbon fiber was improved by 50% - 65 % compared with original carbon fiber reinforced concrete. It is indicated that silanization is a better surface treatment. In addition, the damping reinforced mechanism of surface treatments was also discussed.