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FIGURE 13.25
Simply supported plate with concentrated load. Error in a corner reaction.
FIGURE 13.26
Nodal degrees of freedom for a 21-DOF triangular element.
is still valid for the boundary displacement of a quadrilateral element. Follow the same
procedure as the triangular element to formulate the stiffness matrix for the quadrilateral
element. For the HSM element, the trial functions of Eq. (13.144) can be employed for the
moment distribution in the element. For the quadrilateral element, one more boundary
integral
U
Si j
of Eq. (13.155) is formed and added to Eq. (13.156), leading to a 12
×
12
C
matrix. All of the other procedures remain the same.
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