Experiment on Shear Behavior of PC Beams After Prestressed Tendons Corrosion(PDF)
《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]
- Issue:
- 2018年05期
- Page:
- 134-141
- Research Field:
- Publishing date:
Info
- Title:
- Experiment on Shear Behavior of PC Beams After Prestressed Tendons Corrosion
- Author(s):
- YANG Ri-hua; LIU Huan; ZHANG Xu-hui; WANG Lei; ZHANG Jian-ren
- School of Civil Engineering, Changsha University of Science & Technology
- Keywords:
- bridge engineering; prestressed PC beam; corrosion; shear behavior; experimental research
- PACS:
- -
- DOI:
- -
- Abstract:
- In order to study the influence of prestressed tendon corrosion on shear behavior of prestressed concrete (PC) beams, four PC beams were designed and manufactured. The prestressed tendon in the area of one-sided bending and shearing local zone was rapidly corroded by galvanostatic method, and the shear test was performed on the concrete beams with different corrosion rates of steel strands. The influence of corrosion of prestressed tendons on the cracking, deformation of steel beams, stress of reinforced bars, failure modes and shear bearing capacity were analyzed, and the calculation method of shear bearing capacity of corroded PC beams was discussed on the basis of test. The study results shows that the corrosion of prestressed tendons under the same shear-span ratio has little effect on the failure modes of concrete beams, but it has a greater impact on the development of component cracks, causing a significant reduction in cracking loads. Before cracking, the corrosion of prestressed tendon has little effect on its stiffness; after cracking, the stiffness degradation caused by corrosion is more obvious. Corrosion of prestressed tendon leads to the increased strains of stirrups and longitudinal reinforcement under the same load, it also leads to the degradation of shear capacity of components. The shear strength of concrete beam with corrosion rates of 3.2%, 7.9%, and 13.2%, respectively, decreases by 5.8%, 9.1%, and 15.5% compared to that of un-corroded beams. Considering reduction of crosssection of corroded prestressed tendons, the calculation formula for shear strength of PC beams in Code for Design of Concrete Structures (GB 50010—2010) has high accuracy.
Last Update: 2018-09-03