Numerical simulation and analysis of influencing factors for external prestressed reinforcement of bridges

摘要

External prestressing reinforcement belongs to active reinforcement field. Many researches on this technique have been done at home and abroad, but the numerical simulation is rare. In this paper, ANSYS is used to simulate the process of external prestressing reinforcement, and the influence of reinforcement method, effective prestress and reinforcement time on the reinforcement effect is analyzed. With the increase of tension-controlled stress, the reinforcement effect of simply supported beam is gradually enhanced, but the excessive tensile force can easily lead to the high stress state of anchoring end and external tendons, which is disadvantageous to the structure. With the delay of strengthening time, the cracking load and ultimate load are gradually reduced, and the reinforcement effect is gradually reduced. Therefore, in order to prolong the service life of the structure, it is necessary for the structure to carry on the timing inspection, discover the problem in time, and carry on the maintenance and reinforcement to the structure.