(湖南大学土木工程学院， 长沙 410082)

［摘要］材料的阻尼是衡量材料本身耗能性能的主要指标。在超高韧性水泥基复合材料(UHT-ECC)中掺加一定量的聚合物能够提高UHT-ECC的阻尼。采用自由振动法测试得到了增强阻尼ECC悬臂梁在不同初始顶点位移下的自由衰减曲线，应用信号处理技术得到了构件阻尼比随振幅和聚合物掺量变化的规律。研究了聚灰比、单一乳液及乳液共混对增强UHT-ECC力学性能和悬臂梁阻尼性能的影响。在此基础上，提出了增强阻尼UHT-ECC悬臂梁构件阻尼比的计算理论与方法。试验结果表明:当聚合物采用乳液共混及单一乳液时，最优聚灰比宜分别控制在6%～8%及4%～6%之间，UHT-ECC能够在强度降低不大的情况下，较高地提高其阻尼性能。

［关键词］超高韧性水泥基复合材料构件; 聚灰比; 阻尼比; 阻尼比计算方法

中图分类号：TU375，P315-9文献标识码：A文章编号：1002-848X(2016)15-0079-06

Experimental study on damping property of ultra high toughness cementitious engineered  composite members

Wang Mengfu, Wang Yijun, Xu Yafei

(College of Civil Engineering, Hunan University, Changsha 410082, China)

Abstract:The damping of materials is the main index to measure the energy-dissipation capacity of materials. The damping property of the ultra high toughness engineered cementitious composite(UHT-ECC) can be improved by mixing a specified amount of polymer in the UHT-ECC. Displacement decay curves corresponding to high damping UHT-ECC cantilever beams under different initial top displacements were measured with Pree-oscillation method, and the variation laws of damping ratio versus amplitude and the amount of polymer  were obtained with signal processing technology. In addition, the influences of polymer-cement ratio, the polymer mix single emulsion and the polymer mix emulsions on compressive strength and damping ratio of high damping UHT-ECC cantilever beams were analyzed. Based on these results, calculation theory and method for damping ratio high damping UHT-ECC cantilever beams were put forward. The test results show that: if the polymer adopts mix emulsions, the optimal polymer-cement ratio is in 6%-8%; if the polymer adopts single emulsions, the optimal polymer-cement ratio is in 4%-6%; and the strength of the UHT-ECC is reduced slightly when its damping capacity is surged.

Keywords:ultra high toughness  cementitious engineered composite member; polymer-cement ratio; damping ratio; calculation method for damping ratio

*国家自然科学基金资助项目(51278181)，教育部博士点基金资助项目(20120161110022)。

作者简介:汪梦甫, 教授, 博士生导师, Email: wangmengfu@126.com。