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Critical section for shear in wood beams

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ACI requires that critical shear stress be calculated at the face of
support rather than a distance  'd'  from the face of support when a
concentrated load occurs within a distance 'd' from the face of support.
But UBC 94 chapter 23 without any "Ifs" or "Buts" allows designers to
neglect ANY loads within a distance 'd' from the support. Is wood
different than other materials? Anybody know any other relevant code
provisions?