Why is PLANE223 giving wrong reaction forces? After the solution, the model gives reaction forces in the range of 1e8 (PRRFOR), which are not to reasonable. The same model with PLANE13 (or PLANE223 with weak coupling) gives reaction forces on the order of 1e-8.

This is defect 63207 which is fixed in 12.0. The error is related to the element direct assembly. To calculate the reaction forces, the stiffness matrix has to be requested in the element output pass. A workaround is to set EMATWRITE,YES.

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