Cruciform Column - AISC
Cruciform Column - AISC
(OP)
Folks,
I am analyzing an existing building for additional loads. The framing consists of cruciform columns.
The cruciform column consists of a W36 member with 2 WT 18 welded to the webs forming a + shape. The lateral resistance is gained by knee braces framing into the flanges in each direction at various floors. The knee braces frame at 5' below the beam into the column and 5' into the beam beyond the column.
Can the column be analyzed for combined forces using the equations in Chapter H (H1-1a, b)?
Can I calculate the axial force capacity using E3 and E4?
Can I conservatively assume bending capacity in each direction only provided by an analogous wide flange bending in the strong axis neglecting the other member?
Are there any recommended methods for analyzing cruciform columns such as the one above?
I am analyzing an existing building for additional loads. The framing consists of cruciform columns.
The cruciform column consists of a W36 member with 2 WT 18 welded to the webs forming a + shape. The lateral resistance is gained by knee braces framing into the flanges in each direction at various floors. The knee braces frame at 5' below the beam into the column and 5' into the beam beyond the column.
Can the column be analyzed for combined forces using the equations in Chapter H (H1-1a, b)?
Can I calculate the axial force capacity using E3 and E4?
Can I conservatively assume bending capacity in each direction only provided by an analogous wide flange bending in the strong axis neglecting the other member?
Are there any recommended methods for analyzing cruciform columns such as the one above?






RE: Cruciform Column - AISC
BA
RE: Cruciform Column - AISC
RE: Cruciform Column - AISC
RE: Cruciform Column - AISC
I will calculate the flexural capacity based on the unbraced length = floor height?
RE: Cruciform Column - AISC
I am calculating torsional constant J approximately as the summation of individual rectangular pieces.
RE: Cruciform Column - AISC
RE: Cruciform Column - AISC
RE: Cruciform Column - AISC
In your calculations, the Cw is computed as 2 times the Cw for an I shape.
Are there hand computation methods for computing the Cw for different open shapes?
RE: Cruciform Column - AISC
I have joined in a zip a pair of tables for the axial (factored level) capacities of crosses of IPE and IPN european shapes for A42 steel, and some formulations for J and Cw. Hope it helps to someone. I have more tables for the axial capacity from the Ensidesa manual for such European profiles in other steels.
RE: Cruciform Column - AISC
ht
BA