Parametric Analysis and Experimental Study on Concrete Columns Reinforced by Steel-BFRP Composite Bar

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Title: Parametric Analysis and Experimental Study on Concrete Columns Reinforced by Steel-BFRP Composite Bar

Author(s): Z. Y. Sun, G. Wu, Z. S. Wu, and J. B. Hao

Publication: Special Publication

Volume: 275

Issue:

Appears on pages(s): 1-20

Keywords: steel-BFRP composite bar (SBFCB); concrete column; post-yield stiffness; parametric analysis; experimental study

Date: 3/1/2011

Abstract:
A parametric analysis and experimental study of concrete columns reinforced by steel-BFRP (basalt fiber reinforced polymer) composite bar (SBFCB) were conducted. The relationship between post-yield stiffness of SBFCB and SBFCB reinforced concrete columns was investigated. The influences of reinforcement ratio, axial compression ratio, and post-yield stiffness ratio were explored. The results show that (1) under the same reinforcement ratio, the post-yield stiffness of SBFCB columns increases with the post-yield stiffness ratio of SBFCB; (2) the higher the BFRP content of SBFCB, the better deformation capacity of SBFCB column can be achieved due to the smaller curvature demand of column base; (3) a higher SBFCB post-yield stiffness ratio can delay or prevent the collapse of concrete column caused by P- effect; (4) the residual displacements of SBFCB columns are much smaller than those of ordinary RC columns, that is, the SBFCB column has a more better post-earthquake repairability.