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WoodWorks Sizer determines maximum joist and beam reactions from a structural analysis of each member. For joist areas, only the first and last joists are analyzed. WoodWorks Sizer computes the reactions at the two supports of the first and last joists. These reactions are then used as the start and end values of a distributed load on the supporting beams or walls.
WoodWorks Sizer assumes that the resulting distributed load varies linearly between the first and last joists. In the case of a rectangular joist area on parallel supports, this produces a uniformly distributed load. Any other conditions produce a trapezoidal load. Should uplift occur at one end of a joist area but not at the other, two triangular distributed loads are produced, one positive over a portion of the supporting member and one negative over the remainder of the member.