ANSYS的位移超限

我在用ANSYS模拟一个纤维布加固混凝土梁时，为何加至很小的荷载时即出现“The value of UZ at node 37 is 2287226.75. It is greater than the current limit of 1000000. This generally indicates rigid body motion as a result of an unconstrained model. Verify that your model is properly constrained.”唯一约束没有错误，调整子步作用不大。请教诸位大虾，如何修改？

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