空间曲面纤维网格制作及加固水下混凝土柱试验研究

发布时间：2018-05-15 13:10

本文选题：混凝土结构 + 空间曲面　；参考：《土木工程学报》2017年10期

【摘要】：平面纤维(FRP)网格以其卓越的性能在特定结构加固方面具有较好的应用优势,但其对小尺寸曲面、异形混凝土结构构件的约束加固并不适用。提出了空间曲面纤维网格制作工艺,制作了曲面纤维网格制品,测试了纤维网格拉伸的力学性能;提出了空间曲面纤维网格加固水下混凝土柱的施工工艺,并进行了轴压试验研究,试验结果表明:空间曲面纤维网格加固水下混凝土试件的轴压性能明显优于未加固混凝土圆柱试件,随着纤维网格纤维用量的增加,加固试件的承载能力和变形能力能有效提高,并取得和陆上试件相近的加固效果,根据纤维网格约束量的不同,水下加固试件的应力-应变曲线表现为软化、强化与临界行为,采用现有FRP约束混凝土模型能够较好地预测空间曲面纤维网格加固水下混凝土的极限应力与极限应变。
[Abstract]:Plane fiber reinforced concrete (FRP) mesh has a good application advantage in specific structural reinforcement due to its excellent performance, but it is not suitable for small size surface and special-shaped concrete structural members. In this paper, the fabrication technology of fiber mesh for space curved surface is put forward, and the mechanical properties of fiber mesh are tested, and the construction technology of reinforcing underwater concrete column with fiber mesh of space curved surface is put forward. The axial compression test results show that the axial compression performance of underwater concrete specimens strengthened by space curved fiber mesh is obviously better than that of unreinforced concrete cylindrical specimens, and with the increase of fiber mesh fiber content, The load-bearing capacity and deformation capacity of the reinforced specimens can be improved effectively, and the reinforcement effect is similar to that of the onshore specimens. According to the different constraints of fiber mesh, the stress-strain curves of the underwater strengthened specimens show softening, strengthening and critical behavior. The existing FRP confined concrete model can be used to predict the ultimate stress and strain of underwater concrete strengthened with space curved fiber mesh.
【作者单位】：南京林业大学;东南大学混凝土及预应力混凝土结构教育部重点实验室;北京特希达技术研发有限公司;
【基金】：国家自然科学基金(51208262,51778300) 江苏省自然科学基金(BK20151520) 江苏省“333”工程(BRA2016421) “青蓝工程”项目(QL2017) 江苏高校优势学科建设工程资助项目(PAPD)
【分类号】：TU37

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