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

• 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; 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

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.

开发了新型的纤维增强胶结复合材料，其中不仅将高性能聚合物纤维和钢丝绳混合在一起。那是混合纤维增强的胶结复合材料（HFRCC）。这些新材料实现了如此薄的宽度的多种破裂，以至于复合材料具有高强度，应变硬化和高延展性。结果的摘要如下：1）。研究了HFRCC的混合比例以生产高延性复合材料。检查的参数是纤维的长度和体积内容物以及组合。 2）在新开发的HFRCC中嵌入的变形条上进行了一系列单轴张力测试。通过独特的X射线技术方法仔细观察到了变形条周围的微裂纹。还研究了宏观键行为，以发现比普通混凝土中观察到的更明显的张力僵硬作用。即使在钢筋屈服之后，HFRCC仍然抵抗负载，因此总强度容量远高于屈服强度。3）在剪切载荷下，测试了用变形杆加固的HFRCC梁。纤维类型的影响和踩马车的影响。通过X射线技术仔细观察到破裂的过程以讨论断裂机制。4）在循环载荷下测试了用增强HFRCC制成的列型成员，以检查能量吸收能力，并通过非线性FEM进行数值分析。带有X形钢筋的锥形成员从延展性点和裂纹的损伤水平也显示出非常好的结果，即使在大变形后也是如此。它证明，具有X形增强剂的锥形成员实际上可以用作能量吸收器。