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- Title
构件性能对预应力 CFRP 加固墩柱 抗震性能的影响.
- Authors
卢春玲; 雷振新; 郭铖; 王强
- Abstract
In order to study the effects of reinforcement ratio, stirrup ratio and shear span ratio on the seismic performance of RC square columns strengthened with prestressed CFRP fabric under high axial compression ratio, the low cycle reciprocating load test of 5 reinforced concrete square columns (including 1 unreinforced column and 4 reinforced columns) was carried out. The effects of stirrup ratio, reinforcement ratio and shear span ratio on the failure modes, hysteretic characteristics, skeleton curve, stiffness degradation, ductility and energy dissipation capacity of prestressed CFRP strengthened RC square columns under 0.7 axial compression ratio were analyzed. The finite element model was established with ABAQUS software to verify the test. After verifying the accuracy of the model, extended parameter analysis was carried out for the tests. The results show that under high axial compression ratio, prestressed CFRP fabric can effectively improve the horizontal bearing and deformation capacity of columns, which is beneficial to improve the seismic performance of the columns. The change of stirrup ratio has less influence on the initial stiffness and horizontal bearing capacity of the strengthened columns, but has greater influence on its deformation and energy dissipation capacity. Increase of stirrup ratio is conducive to improving the deformation and energy dissipation capacity of strengthened columns. The reinforcement ratio has a certain influence on the horizontal bearing and deformation capacity of the strengthened columns, and is positively related to the plastic hinge length at the bottom of the strengthened column. In reinforcement design, it should be noted that the constraint range of CFRP fabric completely covers the plastic hinge area. The increase of shear span ratio can obviously improve the deformation capacity of the columns, but has a very adverse effect on the horizontal bearing capacity and stiffness. For columns with large shear span ratio, the utilization rate of CFRP fabric is low and the reinforcement efficiency is not high. The research results can provide an experimental basis for the design and engineering application of bridge piers strengthened with prestressed CFRP sheets under high axial compression ratio.
- Subjects
FINITE element method; CONCRETE columns; SHEAR reinforcements; ENGINEERING design; COMPOSITE columns; FAILURE mode &; effects analysis; CONCRETE-filled tubes
- Publication
Journal of Railway Science & Engineering, 2023, Vol 20, Issue 9, p3437
- ISSN
1672-7029
- Publication type
Article
- DOI
10.19713/j.cnki.43-1423/u.T20221865