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框架弹塑性分析，进行求解时出现的问题：the value of uz at node 39 is 1.0807e13.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 contrained.这是很可能是什么原因啊？框架是用线建立的。然后用beam单元对柱和梁进行截面设置。约束是在框架柱子的底端加的all dof 约束！！
