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Strengthing of existing column

Strengthing of existing column

Strengthing of existing column

(OP)
Hi all
 We have a project that is under construction, during construction we suspected that a column in a frame is overstressed, after checking it, it was true.
So contractor is now working on Reinforcement work for the next floor slab, what is the best way to strength this column with minimum work.
Column is concrete column
Actual stress/Allowable stress=1.5
Floor height is 5.00Ms and it is satisfactory to strength the first 1.00M under the slab

RE: Strengthing of existing column

Depends on the load configuration.  Is it only failing in axial load?  Is there a large moment in the column?

Carbon fiber reinforcing or increase the column section by adding concrete and reinforcement outside the current section.

RE: Strengthing of existing column

Add 5.0 M long angles to the four corners with Hilti anchors to the concrete and welded straps as hoop/ties. Then cover with troweled mortar/Shotcrete/formed concrete cover.

RE: Strengthing of existing column

Can you post the column size, reinforcing and loads plus moment at top and bottom (using sign convention to determine single or double curvature)

Dik

RE: Strengthing of existing column

(OP)
thanks all for your reply
 the dimensions of column is 400mmx400mm
reinforcemnt is 16 bar oof dia. 20 mm
design forces from p-delta analysis is:
ultimate case of Dead load+live load+Earthquake X
Max. N=-1620kN   Mx=147kN.m   My=-8kN.m
Min. N=-1549kN   Mx=154kN.m   My=275kN.m

column is assumed to be hinged at foundation level

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