基于应变硬化能量比值法对PVA-FRCC弯曲韧性的研究

发布时间：2018-03-28 10:22

本文选题：PVA-FRCC　切入点：弯曲韧性　出处：《建筑科学》2017年07期

【摘要】：本文对比分析各国规范以及国内外学者对弯曲韧性评价方法的研究,基于欧洲材料与结构联合会(RILEM TC162-TDF)标准,依据聚乙烯醇纤维增强水泥基复合材料(PVA-FRCC)荷载挠度曲线的变化特征,提出采用纤维提供能量与水泥基材料提供能量比值的方法,即变形硬化能量比值法,对PVA-FRCC进行弯曲韧性评价。该方法计算方便,能反映PVAFRCC的应变硬化特点,较好地适用于PVA-FRCC的弯曲韧性评价。采取该方法对PVA-FRCC四点弯曲试验梁进行韧性计算,分析了国产纤维与进口纤维对韧性的影响。结果表明:PVA纤维的加入明显提高了复合材料的弯曲韧性,而弯曲韧性随纤维掺量的增加而增加;纤维总掺量一定时,进口纤维掺量比例越大,其弯曲韧性越好。
[Abstract]:Based on the European Union of Materials and structures (EMSI) standard RILEM TC162-TDFF, and according to the load deflection curves of PVA-FRCCs, the characteristics of load deflection curves of polyvinyl alcohol fiber reinforced cement matrix composites (PVA-FRCCs) are compared and analyzed in this paper. This paper presents a method of evaluating the bending toughness of PVA-FRCC by using the ratio of energy supplied by fiber to that of cement based materials, that is, the ratio of deformation hardening energy. This method is easy to calculate and can reflect the strain hardening characteristics of PVAFRCC. This method is suitable for the evaluation of flexural toughness of PVA-FRCC. The toughness of PVA-FRCC four-point bending test beam is calculated by this method. The effect of domestic fiber and imported fiber on toughness was analyzed. The results showed that the flexural toughness of composites increased with the addition of w / PVA fiber, and the flexural toughness increased with the increase of fiber content. The greater the proportion of imported fibers, the better the flexural toughness.
【作者单位】：河北工业大学土木与交通学院;河北省土木工程技术研究中心;
【基金】：国家自然科学基金(51108151) 江苏省土木工程材料重点试验室开放基金资助项目国家重点基础研究发展计划(973计划)资助项目(2009CB623203) 河北省房屋与建设厅科技计划项目(201559JS)
【分类号】：TU528

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