钢筋混凝土的例子报错

xuge.ntu119161

很简单的一个例子，总是报错，请帮忙分析一下报错原因吧
报错信息如下：
Whenever a translation (rotation) dof at a node is constrained by a kinematic coupling definition the translation (rotation) dofs for that node cannot be included in any other constraint including mpcs, rigid bodies, etc.
MPCS (EXTERNAL or INTERNAL, including those generated from rigid body definitions), KINEMATIC COUPLINGS, AND/OR EQUATIONS WILL ACTIVATE ADDITIONAL DEGREES OF FREEDOM
Boundary conditions are specified on inactive dof of 9 nodes. The nodes have been identified in node set WarnNodeBCInactiveDof.
Solver problem. Zero pivot when processing D.O.F. 4 of 2 nodes. The nodes have been identified in node set WarnNodeSolvProbZeroPiv_4_1_1_2_1.
Excessive distortion at a total of 64 integration points in solid (continuum) elements
Solver problem. Zero pivot when processing D.O.F. 4 of 2 nodes. The nodes have been identified in node set WarnNodeSolvProbZeroPiv_4_1_1_2_2.
Excessive distortion at a total of 53 integration points in solid (continuum) elements
Solver problem. Zero pivot when processing D.O.F. 4 of 2 nodes. The nodes have been identified in node set WarnNodeSolvProbZeroPiv_4_1_1_2_3.
The plasticity/creep/connector friction algorithm did not converge at 13 points
Solver problem. Zero pivot when processing D.O.F. 4 of 2 nodes. The nodes have been identified in node set WarnNodeSolvProbZeroPiv_4_1_1_2_4.
The plasticity/creep/connector friction algorithm did not converge at 15 points
Solver problem. Zero pivot when processing D.O.F. 4 of 2 nodes. The nodes have been identified in node set WarnNodeSolvProbZeroPiv_4_1_1_2_5.
The system matrix has 2 negative eigenvalues.
The plasticity/creep/connector friction algorithm did not converge at 25 points

请指点如何解决吧，真的头疼啊