I figured out the answer. I needed to turn on the following gmsh flag to make the element only have 8 nodes:
Mesh.SecondOrderIncomplete=1; //req for 2nd order, no face node If this option is not set, the second order quad that gmsh will make has 8 nodes to define the quad element and an additional node in the center of the face, a total of 9 nodes to define the element. So always use the above line if you are exporting 2nd order quads to Calculix/Abaqus.
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