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عمران::
چشمه اتصال
Models C2, C3 and C4 each have two doubler plates of 5 mm thickness welded on two sides of their panel zone.
The panel zone has experienced yielding due to shear force, therefore in addition to column cover plate flexibility, the other complication of "common moment connection" of I-beams to double-I built-up columns is the weakness of panel zone under shear forces.
This rotation includes two parts: a) The shearing rotation contributed by the panel zone of the column and b) The connection rotation, caused by the relative deformation between the beam and the column due to bending deformation of the column cover plate.
For prevention of panel zone yielding and increasing the panel zone stiffness, we have used doubler plates with thickness of 5 mm on two sides of panel zone of model C2.
It can be seen from Figure 7 that using doubler plates prevents panel zone from yielding but plastic deformations have still occurred on column cover plate.
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