Analysis of Local Stress and Improvement of Stress State on Key Parts of the Polyline Pretensioned Beam

摘要

To research the local stress state of the polyline pretensioned beams, the 3-D nonlinear finite element model is established by FEA software ANASYS. The results show that the existence of the inflection point on the prestressed reinforcement is the main reason of local stress distribution, and the corner radius R is the primary influential factor of the local stress distribution phenomenon. Then, the variation law of the stress and stress distribution by the corner radius R is illustrated clearly. With the increasing of R, the maximum local stress has decreased, and the stress distribution curve has increasingly become smoothly and gently. Considered the variation law of local stress and various of construction requirement in engineering practice, R= 600mm is selected as the optimal radius. This research lays a good foundation for the further researches and wide applications of the polyline pretensioned beams.