EWPAA Structural Plywood and LVL Design Manual - Engineered ...

g 19f'bde= plywood assembly modification factor= characteristic bending strength= effective depth of gusset at critical sectionv. Determine I p , the polar moment of area for each ring of nails, and sum to findI p(total) .The procedure followed herein is that proposed by Hutchings and described in theNail Joint Action section.vi.Determine the moment capacity of the joint such that:φM≥M*AS1720.1-1997 approach for determining rotational joint capacity requires application ofEquation 10.10:The Hutching Method, which applies the classical torsion equation in which nail force isdirectly proportional to distance from the nail group centroid, will be used. That is:where: M*φφM = φ.k 1 .k 13 .k 14 .k 16 .k 17 .Q k [l p / r (10.12)m ]kk= design action effect on joint (in-plane moment)= capacity factor for a nailed jointAS1720.1-1997Clause 2.31 = the factor for duration of load for jointsAS1720.1-1997,13= 1.0 for nails in side grain= 0.6 for nails in end grainClause 2.4.1.1kkk141617rrQImIkp= 1.0 for nails in single shear= 2.0 for nails in double shear= 1.2 for nails driven through close fitting holes inmetal side plates= 1.1 for nails driven through plywood gussets= 1.0 otherwise=factor for multiple nailed joints given inAS1720.1-1997 Table 4.3(B) forType 1 joints toresist in-plane moments= the maximum value of rI= the distance from the ith nail to the centroid ofthe nail group= characteristic capacity given in= polar moment of inertiaAS1720.1-1997Table 4.1(A)and 4.1(B)vii.Check capacity of worst loaded nail.130