Study On Post-earthquake Emergency Pipeline Reinforcement

FRP( Fiber Reinforced Plastic) is a strengthening material that is widely used in our country. Bonding FRP to the surface of structure is an efficient and quick method for strengthening concrete structures, however, many problems should be solved in the domain of hydro-structure, especially underground pipeline quickly strengthened after earthquake by FRP on which systemic research has not been carried out in the world.Under the background of application problems of FRP, the fundamental research that is the earthquake damaged reinforced underground pipes meeting or not-meeting the application requirements before the earthquake is studied in this paper combining with the research program of National Eleventh Five-Year Science and Technology Support Program of China.1. To find a rapid and effective reinforcement method, this paper designed the same parameters of the pipeline, taking into account the different degree of injury, different reinforcement materials and different number of FRP. Tests provide enough preparation for further research and the conclusions in this paper has important reference value because of so many extensive samples.2. This paper designed two part test. One is the pipe under uniform internal pressure, another is three-point test, Focusing on the regular service performance of concrete pipes have been damaged strengthened by CFRP or GFRP. The study provides the basis for engineering application and follow-up work.3. Uniform internal pressure based on test results, FRP reinforced concrete pipes' cracking and ultimate strength formula in serviceability limit stage were given. Furthermore concrete pipes' crack formula reinforced by FRP Derivation was deduced.4. By using the finit element software ANSYS, the three-point test finite element model was set up, and various factors affecting the performance of the reinforcement effect were investigated both analytically and experimentally. At the same time, the limit load under finite element analysis was also given, which had been compared with the experimental results.