Development and Validation of a Seismic Retrofit Scheme for Reinforced Concrete Beam-Column Joints

Abstract eng:
An innovative and efficient technique is presented for the seismic retrofit of reinforced concrete beam-column joints using prestressed high-strength steel wires (PHSW). This method is to improve the seismic performance and enhance the shear strength of beam-column joints with non-seismic design as well as to overcome the shortcomings of traditional seismic retrofitting techniques for the joints. Five interior beam-column joints that were tested under reversed cyclic loading. The specimens included one un-retrofitted control specimen and four strengthened joints using proposed PHSW technique including two joints without transverse beam and two with transverse beams. Test results showed a significant increase in the joint shear capacity and reduction of the cracks on the joints in retrofitted specimens. In addition, energy dissipation and ductility level of beam-column joints were improved in retrofitted specimens compare to control specimen. The failure mode of the retrofitted specimens altered from brittle shear failure of beamcolumn joints to the ductile flexural failure. Meanwhile, no anchorage failures at lap splice locations of steel wire were observed in the tests. External retrofit technique proposed in this paper provides excellent tools to overcome the stress-lag between the retrofitted and the original part, by increasing the positive confinement around the joint.

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