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NB 3227.2 pure shear

NB 3227.2 pure shear

NB 3227.2 pure shear

(OP)
I'm doing a design stress calculation of a flange connection according to ASME Code, Div. 1, Subsection. The part of the calculation is to check the bolts and nuts for the shear stresses for DESIGN and TEST conditions. The Paragraph NB 3227.2 says that 'the average primary shear stress' should be less than 0.6Sm. Does anybody knows what the word 'primary' means in this context. I found couple of papers which use the word 'primary' for the shear stress devoleped by a direct tension. The stresses caused by a bending are called secondary. Another tip I got is that the primary shear stress stands for the stress developed by a pressure only (pretension and thermal expansion are secondary). Can anybody help?

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