Ⅱ型模态控制下的GFRP-混凝土界面断裂韧度测定

发布时间：2018-10-09 21:22

【摘要】：介绍了一种适用于评价GFRP-混凝土界面断裂性能的理论分析模型,并结合端部开口试件的四点弯曲试件(4ENF)试验,测得了该类界面在II型模态控制下的断裂韧度.该模型考虑了试件各子梁中的横向剪切变形对能量释放率的影响,引入一阶剪切变形梁理论对界面断裂过程进行模拟;同时由于混凝土在受剪及受拉区域容易发生破坏,故试件设计过程中引入钢筋进行加强,有效减少了实验数据的离散性;进一步通过与有限元仿真进行对比发现结果吻合较好,这说明本文方法能够有效测定II型模态荷载控制下复合材料-混凝土界面的断裂韧度,评价复合材料增强混凝土结构的界面断裂性能,预测界面的起裂、裂纹扩展和失效容差.
[Abstract]:A theoretical analysis model for evaluating the fracture properties of GFRP- concrete interface is introduced. The fracture toughness of this kind of interface under the II mode control is measured by combining with the four-point bending specimen (4ENF) test of the open end specimen. The model takes into account the effect of transverse shear deformation on energy release rate, and introduces the first-order shear deformation beam theory to simulate the interfacial fracture process, and at the same time, the concrete is liable to destroy in the shear and tensile region. Therefore, the reinforcement bar is introduced in the design of the specimen, which effectively reduces the discreteness of the experimental data, and further compared with the finite element simulation, it is found that the results are in good agreement with each other. The results show that the proposed method can effectively measure the fracture toughness of composite / concrete interface under II mode load control, evaluate the interface fracture properties of composite reinforced concrete structures, and predict the initiation, crack propagation and failure tolerance of composite reinforced concrete structures.
【作者单位】：上海交通大学船舶海洋与建筑工程学院;上海交通大学高新船舶与深海开发装备协同创新中心;上海交通大学海洋工程国家重点实验室;
【基金】：国家自然科学基金(51478265)
【分类号】：O346.1

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