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专业: 结构工程

[求助] ANSYS中节点位移超过限值是什么原因？

请问大家，我做的是纤维混凝土粘结，加了弹簧单元combination39，用KEYOPT（3）设置了两个方向，对要加弹簧的节点建立重合节点，在重合节点上建立了两个不同方向的弹簧，在计算中总出现“The value of UX at node 281 is 2.472947933E+10. 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” 和 "Rigid body motion can also occur when net section yielding has occurred resulting in large displacements for small increments of load or when buckling has occurred. You can plot the time history curve for node 281 in the UX direction to check for stiffness (slope of the curve) approaching zero."这个是什么原因？
我的约束是对底面所有节点施加的X,Y,Z平动约束，加载装置如下图所示。

模型图.png