Open AccessStudy on the destructive test of T-beam strengthened by external prestressing
Author(s) -
Jianhua Wu,
Xiujuan Jiang,
Laiyong Wang
Publication year - 2020
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1549/2/022110
Subject(s) - deflection (physics) , beam (structure) , structural engineering , cracking , reinforcement , bearing capacity , stiffness , materials science , t beam , composite material , engineering , physics , optics
Three T-beams with severe cracks in the operation were selected for the approach bridge of the Yellow River Bridge of a national highway. Three pieces of external T-beams were used for reinforcement and the destructive tests were carried out on the strengthened T-beams. The test results of the T-beam test of the approach bridge are analyzed to evaluate the bearing capacity. The main conclusions are as follows: The strengthened T-beam has greatly improved the mechanical performance, improved the cracking load of the T-beam, and slowed the crack development. The change of beam deflection is divided into three stages: 0~30t, 30~66t, 66~134t. The deflection value increases gradually, and the turning point of deflection changes basically corresponds to the crack development. The stiffness and ultimate load carrying capacity of the T-beam are greatly improved, which greatly improves the safety of the T-beam. Due to the lack of space at the bottom of the beam, the test beams of the three pieces of reinforcement were loaded to the final failure, and the maximum crack width has reached the loading termination condition. This indicates that the elastic stress stage of the T beam is increased after the reinforcement, and the T beam has a strong T-beam. Deformation recovery capability. It provides some reference for the reinforcement and transformation of similar T-beams and the evaluation of bearing capacity.