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标题: 请教零刚度问题 [打印本页]

作者: nilii 时间: 2009-7-24 17:02 标题: 请教零刚度问题

ZERO STIFFNESS IN DIRECTION 4 AT JOINT 497 EQN.NO.    562
      LOADS APPLIED OR DISTRIBUTED HERE FROM ELEMENTS WILL BE IGNORED.
      THIS MAY BE DUE TO ALL MEMBERS AT THIS JOINT BEING RELEASED OR
      EFFECTIVELY RELEASED IN THIS DIRECTION.
ZERO STIFFNESS IN DIRECTION 5 AT JOINT 497 EQN.NO.    563
ZERO STIFFNESS IN DIRECTION 5 AT JOINT 505 EQN.NO.    581
ZERO STIFFNESS IN DIRECTION 4 AT JOINT 773 EQN.NO.    640
ZERO STIFFNESS IN DIRECTION 5 AT JOINT 773 EQN.NO.    641
ZERO STIFFNESS IN DIRECTION 5 AT JOINT 779 EQN.NO.    659
ZERO STIFFNESS IN DIRECTION 5 AT JOINT 647 EQN.NO.    815
ZERO STIFFNESS IN DIRECTION 4 AT JOINT 643 EQN.NO.    826
ZERO STIFFNESS IN DIRECTION 5 AT JOINT 643 EQN.NO.    827
ZERO STIFFNESS IN DIRECTION 5 AT JOINT 416 EQN.NO. 1055
ZERO STIFFNESS IN DIRECTION 4 AT JOINT 867 EQN.NO. 1096
ZERO STIFFNESS IN DIRECTION 5 AT JOINT 867 EQN.NO. 1097

**WARNING - THERE WERE MORE THAN 12 DOF WITH ZERO STIFFNESS.
            THE FIRST 12 ARE LISTED ABOVE.
            TOTAL # TRANSLATIONAL=    10 TOTAL # ROTATIONAL=    46

702. FINISH
没搞懂这是怎么回事，请教大家！！

作者: 懒虫 时间: 2009-7-27 08:21

常见问题。
一个节点有6个自由度，如果某个没有被约束就会提示这个，一般是连接某节点的所有杆件都释放了弯矩，那么这个节点的转动自由度就缺少约束，会有这样的提示。
两个杆件铰接，只要释放一个杆件的杆端约束就可以实现了。

作者: nilii 时间: 2009-7-27 10:58

非常感谢版主，节点处有时候设半铰，这些地方可能没注意杆件已经被全部打断了的。

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