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

FIGURE 9.11 summaries the shear flows and shows the result of superposing the two effects.FIGURE 9.11: Shows the effect of Superposing Shear FlowsA suitable nailing schedule can now be chosen.9.9 Vertical OffsetsDiaphragms - Worked Example 4The first diagram in FIGURE 9.2 shows a diaphragm with a vertical offset. Evidently there are different designloads applied to the two diaphragms.The obvious deficiency in such a structural configuration is the lack of continuity of the chord members, afundamental requirement for the satisfactory functioning of a diaphragm.Solutions to the problem do exist including:• providing a vertical bracing element at each level. This could be a solid wall, however windows inthis region would preclude this possibility;• incorporating a rigid frame of some type;• use of diagonal bracingIf none of the above provide a satisfactory solution an alternative is sought. Such a solution requires toeffectively splice the two chord members by utilising the plywood wall sheathing to do so.Lower diaphragm chord forces : From the free body diagram to the right of the offset:17∑ MOR= 25 x17 + FLcx 5 − 2 x17 x2= 0136FLc=5= 27.2kNSub-diagram forces : From the elevation shown in FIGURE 9.12:108