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

Re-arranging the torsion equation results in:τ A= pn=Tρn n2∑ yii= 1 i=12i+ ∑ x(10.8)The critical nail force will occur on the nail which has:• components of p in, i.e.p inx and p iny additive to the components of P, in this case P/nHence, nail 2 in Figure 10.5 will be the worst loaded nail. The components of nail load willbe:where:pp2 x2 y==TITIypxp222 r = (p2x) + (p2 y Py/n)p +(10.9)There is no reason why this approach cannot be used in practice provided a suitablecomputer program was developed.Alternative Methods are available for determining the moment capacity of rotationaljoints such as that shown in FIGURE 10.6.FIGURE 10.6: Typical nailing pattern and an idealised line representationAS1720.1-1997 suggests the application of the relationship:φM j⎡3 / 2n ⎛ r ⎤⎢i∑ ⎥⎢ ⎟ ⎞= φk 1k13k14k16k17rmaxQk⎜i=1 ⎥⎣ ⎝ rmax⎠ ⎦(10.10)127