Shear Resistance Calculation

Using O86 6.5.4 for sawn lumber, 7.5.7.3(b) for glulam, and 15.3.3.4 for SCL SIzer determines shear resistance with equations of the form

V_r = 2/3 f F_v AK_zvK_N

• f = 0.9.
• F_v is the specified shear strength f_v multiplied by wet service, treatment, system, and load duration factors.
• A is the cross-sectional area. Under different circumstances, gross cross sectional area and net area after notch removal are used.Refer to Notch Design for more details.
• K_zv is a size factor defined differently for each material.
• K_N is the a notch factor, defined differently for glulam and sawn lumber. CLT and SCL members are not notched. Refer to Notch Design for more details.

For glulam design, this formula applies to columns and optionally to beams less than 2 cubic meters in volume. For beams greater than 2 cubic meters, a formula from 7.5.7.3(a) based on gross loading must be used, and it can be used for smaller beams. Refer to Glulam Shear Design for more details.

For both sawn lumber and glulam with notches, an additional fracture shear check is required. Refer to Notch Design for more details.