GFRP筋拉拔模型试验及仿真分析

发布时间：2018-07-28 12:57

【摘要】：作为边坡、基坑工程中一种常见的支护技术，土钉在世界范围内得到了广泛的应用。目前，在工程中最为常见的土钉，是由变形钢筋和砂浆通过钻孔注浆形成的。在生产实践中，由于钢筋具有易腐蚀、耐久性差等缺点，一直是锚固工程中的隐患。玻璃纤维增强塑料（Glass Fiber Reinforced Plastics，缩写为GFRP）筋作为一种新型复合材料，具有很高的性价比，同时具有很多优点，如强度高、质量轻、耐腐蚀性强、低松弛、耐电磁等，如果能够将GFRP筋代替钢筋，可以解决钢筋土钉带来的很多问题。正因为如此，研究玻璃纤维增强塑料已经成为了一个新的趋势。在美国、加拿大、韩国、香港、日本等发达国家和地区，玻璃纤维增强塑料在各类工程建设中已经有效取代钢材，应用于土钉、土层锚杆、土工格栅、桩基础等岩土加固体中。本文是得到“国家自然科学基金资助项目（51278391）”以及“湖北教育厅优秀中青年人才项目（Q20121111）”的资助下开展的工作。在总结了国内外大量研究的基础上，介绍了关于GFRP筋的一些理论知识，包括细观力学理论、界面理论以及GFRP筋与砂浆的粘结理论。论文对26组不同埋深、不同直径和不同砂浆强度的GFRP筋与砂浆拉拔试件进行了拉拔承载力以及粘结强度的研究。试验结果表明，拉拔承载力是随着埋深的增加而增大，随着砂浆强度的增大而增大，但是随着直径大小的变化不太明显；对于粘结强度，是随着拉拔试件的埋深的增大而减小的，随着直径的增大而减小，随着埋深的增大而减小。利用ANSYS程序对GFRP筋与砂浆拉拔试件进行了仿真分析。建立不同埋深不同直径的有限元分析模型，对模型的拉拔承载力、粘结应力以及裂缝开展规律进行分析研究，，并与试验结果进行对比。研究结果表明，模拟结果与试验结果较为接近，即利用ANSYS软件能够较为准确用来验证试验结果。
[Abstract]:As a common supporting technology in the foundation pit engineering, soil nailing is widely used in the world. At present, the most common soil nailing in the project is formed by grouting of deformed reinforcing bar and mortar through drilling. In production practice, the reinforcement has the defects of perishable corrosion, poor durability and so on. It has always been the anchorage project. Glass fiber reinforced plastic (Glass Fiber Reinforced Plastics, abbreviated as GFRP) as a new type of composite material with high performance price ratio and many advantages, such as high strength, light quality, strong corrosion resistance, low relaxation, resistance to electromagnetic and so on. If you can replace the bar with GFRP reinforcement, it can solve a lot of steel soil nailing. Because of this, it has become a new trend to study glass fiber reinforced plastics. In the developed countries and regions of the United States, Canada, Korea, Hongkong and Japan, glass fiber reinforced plastics have effectively replaced steel in all kinds of engineering construction, which are applied to soil nailing, soil anchor, geogrid, pile foundation and other geotechnical and solid foundation.
This paper is carried out under the aid of the National Natural Science Fund (51278391) and the excellent medium and young talent project of the Hubei Education Hall (Q20121111). On the basis of a large number of studies at home and abroad, some theoretical knowledge about GFRP tendons, including meso mechanics theory, interface theory and GFRP, are introduced. The theory of bond between reinforcement and mortar.
The drawing bearing capacity and bond strength of 26 groups of GFRP bars with different buried depth, different diameter and mortar strength are studied. The test results show that the drawing capacity increases with the increase of buried depth and increases with the increase of mortar strength, but it is not obvious with the diameter of the mortar. The bond strength decreases with the increase of the depth of the drawing specimen, decreases with the increase of the diameter, and decreases with the increase of the buried depth.
The ANSYS program is used to simulate the drawing test of GFRP reinforcement and mortar drawing. The finite element analysis model of different buried depth and different diameter is set up. The drawing bearing capacity, bond stress and crack development law of the model are analyzed and studied, and the results are compared with the experimental results. The results show that the simulation results are close to the test results. That is, ANSYS software can be used to verify the test results more accurately.
【学位授予单位】：武汉科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU476

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