Dear all,
If steel jacketing is used to retrofit a reinforced-concrete (RC) column, can we use it to improve flexural strength? I understand that we leave gaps between the ends of the jacket and ends of the column to prevent the bearing of the jacket on foundations, and thus we prevent an unintended increase in flexural strength.
However, is there a way steel jacketing can be used to directly increase the flexural strength of RC columns? like the effect of RC jackets? If so, could you please elaborate on the detailing?
Regards,
Karim
Hi S M Anas
Many thanks for sharing this paper. However, it does not answer my question, as the authors are not considering the steel jacket participating directly (like tensile reinforcement) to enhancing flexural strength.
Regards,
Karim
Ciao Karim,
I believe that yes. We can use steel jacketing as tensile reinforcements. The trick is that the steel sheets need to be connected to the rc members by the means of mechanical anchors or through welding (which either of them will need to cary significant shear stresses) to the existing rebars. This can be a convenient way to increase the flexural strength in mid span of rc beams, but I believe from a construction point of view it will be difficult to apply steel jacketing in the end of elements in rc frames for this purpose. However, should be some pre-qualified connection types in order to ensure a reliable transfer of tensile forces between the end of rc elements. I need to search if I have any material on steel jacking design.
Ciao Enes Veliu
I completely agree with you in the case of improving the flexural strength in the mid-span (like extra reinforcement with sufficient development length). However, this is not useful for columns as seismic moment in mid-span is very small. I am still wondering what can be done about the sides of columns (i.e. top and bottom), which is the main point of confusion. Anyway if you find something useful please let me know.
Karim Aljawhari I need to search on my folders but I believe it is doable (If it is a must). What I have in mind now is using some long steel bolts to connect the steel jackets of two adjacent column ends (the ends on both sides of a beam). Imagine smth similar to how the moments are transferred in the bolted end plate steel connections.
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