ABSTRACT
Four models were considered in the numerical study: one was the control model and the other three were CFRP wrapped exterior beam-column joints with various wrap thicknesses under combined axial and lateral cyclic loads. The column and the beam cross-section and height dimensions are 127× 127× 1067mm (5× 5× 42 in) and 76× 127× 610mm (4× 6× 24 in), respectively. For all beam-column joints, the strength of concrete is 27.6Mpa (4,000 psi), with the modulus of elasticity of 20,690Mpa (3× 106 psi), and Poisson ratio of 0.17. The rebar strength is 414Mpa (60,000 psi) withmodulus of elasticity of 206,896Mpa (3× 107 psi), Poisson ratio of 0.3, and yield strain of 0.002. Concrete or steel is considered as isotropic materials. The CFRP is unidirectional, orthotropic elastic material with 0.18mm (0.007 in) thickness per layer; the modulus of elasticity along the fiber direction and Poisson’s ratio are 4,1379Mpa (6× 106 psi) and 0.22, respectively; the ultimate strain of CFRP is 0.016. An axial load value of 110 kN (25,000 lb), equivalent to 0.25Agf ′c and a cyclic lateral load sequence are applied to the top of the column.
