摘要
纤维与聚合物的掺入可以明显改善混凝土材料的阻尼性能。本文首先给出了正弦交变激励下粘弹性材料三点弯曲梁阻尼特性关系，其次首次自主开发了大尺寸材料的阻尼性能测试装置，然后利用开发的装置在频率（0．5～2．0Hz）条件下测定了6种不同配比复合纤维增强阻尼混凝土的损耗因子与储存模量，最后对纤维的阻尼增强机理进行了初步探讨。试验结果表明：复合纤维增强阻尼混凝土与素混凝土相比，提高了混凝土的损耗因子80％～200％。主要原因是聚合物分子在外力作用下的内耗增加了普通混凝土的阻尼能力，而纤维的阻尼增强机理在于纤维的掺入增加了纤维与水泥基材的界面摩擦力。
Fibers and polymers as the admixtures in the concrete may improve greauy the damping ability of concrete materials. In this paper, firstly the damping relationships of viscoelastic materials via three-point support beam experiment were given under sinusoidal alteration excitation. Secondly, the damping measuring instrument for large-scale materials such as concretes was self developed. Thirdly, the loss tangent and storage modulus for fiber reinforced concretes of 6 different ratios were measured in the range of frequencies （0.5-2.0Hz） by this instrument. Finally, the mechanism of damping reinforcement of the fiber was initially discussed. The experiments show that composite concrete reinforced with polymers and fibers exhibits increases of loss tangent by 80-200 % compared to the corresponding value of the ordinary concrete without any admixtures. The internal dissipation of the polymer molecules is the mechanism for improvement of damping energy of ordinary concrete, and the friction on the interfaces between fibers and cement-based materials contributes to the damping of fiber reinforced concrete.
出处
《实验力学》
CSCD
北大核心
2006年第4期403-410,共8页
Journal of Experimental Mechanics
基金
国家自然科学基金"十五"重点项目(50238040)
广东省自然科学基金博士科研启动项目(05300894)
浙江省自然科学基金项目(M503145)
关键词
三点弯曲梁混凝土阻尼测试装置
复合纤维
损耗因子
储存模量
阻尼增强机理
three-point support damping measuring instrument for concretes
hybrid fibers
loss tangent
storage modulus
damping reinforced mechanism
