and in the construction of the construction, there will be different ways, the following we take a look.
If you add a horizontal rib, a rib will divide the board into two zones,
then both sides of the rib zone can be taken as three sides simple support,
one side fixed. In this case, the plate has a span bending moment in X and Y directions,
and a bearing moment at the bearing line of the middle rib, and the bearing moment plays a controlling role.
If the two zones are equal across,
the solid end moment coefficients can be used to find out the balance of the bearing moment coefficients obtained after the bearing bending moment,
if not equal across we must first find out the solid end moment and then balance,
to find out the bearing moment. Add two horizontal ribs, two ribs will be divided into three zones,
where the two ends of the two zones to take three simple support,
one side of the fixed calculation sketch, in a zone to take two pairs of simple support, two pairs of fixed side.
There is also a form of cross with ribs, two mutually perpendicular ribs will divide the plate into four zones,
all four zones can take two adjacent side simple support, two adjacent side fixed.
Four zones, plate span are X, Y two directional bending moment,
each zone on both sides of the rib support line support at both sides of the bearing moment,
two support bending distance in a large value, to play a controlling role.