Diaphragms With End Horizontal Offsets - The Analysis of Irregular Shaped Structures - page 86

F i g u r e 3.3 Shear distribution into a simple diaphragm.
acting on the edges of the sheathing elements in the positive and negative areas of the
shear diagram. The positive and negative sheathing elements are placed on the plan at
the top and bottom chords, and at the diaphragm support walls for reference. The shears
transferred from these sheathing elements into the boundary members are also shown
on the plan. The shears transferred into the boundary members are equal in magnitude
but opposite in direction to the shear acting on the sheathing elements. At grid line 1, it
can be seen that the diaphragm shears that are transferred into the boundary elements
are acting in the negative direction, suggesting that the diaphragm is being pushed off of
the vertical supports (walls). The walls shears that resist these transfer shears act in the
opposite direction and are positive. The direction of the shears transferred into the strut