Design of minor axis moment and shear for RC Beam

[David Chan]

HI everyone,I have design question regarding the captioned, hope that you could give me some advice.

Now that I'm designing RC beams subject to vertical loading as well as horizontal force, which induces significant minor axis moment and shear.

For bending check, side bars are provided to resist minor axis moment. However, I'm wondering the assumption for the minor axis shear checks as below and which is the most rational:

The shear links provided have to resist:

(i) Maximum of ( major axis of shear stress, minor axis of shear stress)
(ii) Summation of ( major axis of shear stress + minor axis of shear stress)
(iii) Resultant of ( major axis of shear stress & minor axis of shear stress) i.e. SQR (vx^2 + vy^2)

Hope that you could give me some advice, thanks.

 

[Agent666]

ACI318-19 added some guidance on biaxial shear for columns that you could follow. A beam is a column with an axial load of zero.

There was a thread a while ago where the same thing came up. I posted the provisions from ACI318-19 in the linked thread.

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