Moments in Column
Moments in Column
(OP)
I have a 3 level precast column, with corbels on one side, supporting precast beams at each level (The column is an end column in a bay). The columns are tied at each floor at the tops of the beams, and are braced in the other direction by the floor. Based of the column is assumed to be pinned, and the base of the beams cannot take any significant horizontal load, as it sits on a bearing pad.
Each floor level load will tend to bend the column outwards, so looking at the deflected shape of the 3 level column, would I have double curvature?
Each floor level load will tend to bend the column outwards, so looking at the deflected shape of the 3 level column, would I have double curvature?






RE: Moments in Column
RE: Moments in Column
Drawing it out, I can't see how it would be anything but double curvature....
RE: Moments in Column
RE: Moments in Column
Can you create a simple RISA model of the column with cantilevered pieces acting as corbels, and see how it deflects?
RE: Moments in Column
RE: Moments in Column
RE: Moments in Column
RE: Moments in Column
If the moments were of opposite sign at each floor, then they would act together to bend the column outwards in single curvature....
see sketch below - found it in one of my textbooks - thanks all for your comments
RE: Moments in Column
RE: Moments in Column
1. apply the moment from each corbel to a section of colum 2 stories high pinned at top and bottom and reatrained laterally at the corbel.
2. superimpose these on each other to get an overall moment diagram.
this will be reasonable close to your actual diagram.
As noted above you will find they the bottom floor is in single curvature but many of the top floors are in double curvature.
csd