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RE: Concrete Column Biaxial Bending

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                        I’ve never had such low moments that the equation blew up. However, I think you can take that as your answer: the moments are sufficiently low that biaxial bending is OK.

                        I have no experience with your other question regarding the angle of twist due to torsion in concrete,  Have you looked at the strut and tie model that ACI now uses for shear and torsion?

            Jim Getaz

            Precast Concrete Engineer