权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Development of Hybrid Fiber Reinforced Cementitious Composites and their Structural Application

混杂纤维增强水泥基复合材料的研制及其结构应用

基本信息

批准号：
12555157
负责人：
MIHASHI Hirozo
金额：
$ 8.51万
依托单位：
Tohoku University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2002
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-12555157/
关键词：
Cementitious Composite Hybrid Composite Steel Cord Polymeric fiber High Ductility Energy Absorption Bond Cracking Shear Failure ハイブリッド複合材繊維補強高靭性化スナッビング

项目摘要

New type of fiber reinforced cementitious composites were developed, in which not only high performance polymeric fibers but also steel cord were mixed together. That is Hybrid Fiber Reinforced Cementitious Composites (HFRCC). These new materials achieve multiple cracking of so thin width that the composites are possessed of high strength, strain hardening and high ductility. The summary of the results are as follows :1). Mix proportion of HFRCC was studied to produce the highly ductile composites. Examined parameters were the length and volume contents of fibers, and the combination. Not only the mechanical performance but also the workability was investigated.2) A series of a uniaxial tension test was carried out on a deformed bar embedded in the newly developed HFRCC. Microcracking around the deformed bar was carefully observed by means of a unique method of X-ray technique. Macroscopic bond behavior was also studied to find a much more obvious tension stiffening effect than that observed in plain concrete. Even after yielding of the steel bar, HFRCC still resisted the load so that the total strength capacity is much higher than the yield strength.3) HFRCC beams reinforced with deformed bars were tested under a type of shear loading. Influences of type of fibers and also stirrups ware examined. Cracking process was carefully observed by means of the X-ray technique to discuss the fracture mechanism.4) Column-type members made with reinforced HFRCC were tested under cyclic loading to examine the energy absorption capacity and also numerically analyzed by means of a nonlinear FEM. Tapered members with X-shaped reinforcement showed very good results from the view point of the ductility and the damage level of cracking even after a large deformation. It proved that the tapered members with X-shaped reinforcement can be practically applied as energy absorbers.

新型纤维增强水泥基复合材料是将高性能聚合物纤维与钢丝帘线混合而成的新型纤维增强水泥基复合材料。这就是混杂纤维增强水泥基复合材料（HFRCC）。这些新材料实现了多裂纹，使复合材料具有高强度、应变硬化和高塑性。主要研究结果如下：1）.研究了制备高韧性复合材料的HFRCC配合比。检查的参数是纤维的长度和体积含量，以及组合。2）对新型复合材料中的变形钢筋进行了单轴拉伸试验。用独特的X射线技术对变形棒周围的微裂纹进行了仔细观察。宏观粘结性能也进行了研究，发现比素混凝土中观察到的更明显的拉伸硬化效应。即使钢筋屈服后，HFRC仍能抵抗荷载，其总承载力远高于钢筋的屈服强度。3）进行了一种变形钢筋加固HFRC梁的抗剪试验。纤维类型和箍筋的影响进行了研究。采用X射线技术对试件的开裂过程进行了观察，探讨了试件的断裂机理。4）通过反复加载试验，研究了高强纤维混凝土柱的吸能性能，并采用非线性有限元方法进行了数值分析。从延性和开裂破坏程度的角度来看，即使在大变形后，带有X形钢筋的锥形构件也表现出非常好的结果。证明了X形配筋楔形构件作为吸能构件是可行的。