Journal of Applied Sciences1812-56541812-5662Asian Network for Scientific Information10.3923/jas.2008.4579.4586MokariJ. MoghadamA.S. 122008824An effective enhancement of the reinforced concrete
columns with low ductility can be accomplished thru increasing its confinement.
Confinement generally is provided by lateral reinforcing in columns sections.
If lateral reinforcing is insufficient, use of external devices such as
FRP, steel or reinforced concrete jacketing is effective for columns retrofitting.
In this study, steel jacketing with thermal post tension, as an external
confinement, is proposed. In order to evaluate the efficiency of this
method, theoretical and experimental approaches are used. The theoretical
approach is based on solving the plane strain equation of a section considering
nonlinear behavior of concrete. Confinement pressure will be obtained
by solving the equation at each step of applying axial load at the top
of the column. To enter confinement pressure term in stress-strain relationship,
approach proposed by Mander is used. Modified stress-strain relationship
of retrofitted section by the proposed method is also capable of modeling
cyclic behavior. A comparison of experimental and theoretical approaches
leads to promising results for the proposed approach.]]>Mander, J.B., M.J.N. Priestley and R. Park,198811418041826Fam, A.Z. and S.H. Rizcalla,200198451461Stephen, P.T. and J.N. Goodier,19703rd Edn.,Pages: 567Pages: 567Dritsos, S. and K. Pilakoutas,19941994pp: 667676James, R.C. and G.D. Robert,20062006