為什么降溫法模擬鋼絞線（桁架單元）后處理云圖中會這樣？
Solver problem. Zero pivot when processing D.O.F. 2 of 4 nodes. The nodes have been identified in node set WarnNodeSolvProbZeroPiv_2_1_1_1_1.
Solver problem. Zero pivot when processing D.O.F. 1 of 6 nodes. The nodes have been identified in node set WarnNodeSolvProbZeroPiv_1_1_1_2_1.
Solver problem. Zero pivot when processing D.O.F. 2 of 6 nodes. The nodes have been identified in node set WarnNodeSolvProbZeroPiv_2_1_1_2_1.
Solver problem. Zero pivot when processing D.O.F. 3 of 4 nodes. The nodes have been identified in node set WarnNodeSolvProbZeroPiv_3_1_1_2_1.
Solver problem. Zero pivot when processing D.O.F. 1 of 6 nodes. The nodes have been identified in node set WarnNodeSolvProbZeroPiv_1_1_1_3_1.
Solver problem. Zero pivot when processing D.O.F. 2 of 6 nodes. The nodes have been identified in node set WarnNodeSolvProbZeroPiv_2_1_1_3_1.
Solver problem. Zero pivot when processing D.O.F. 3 of 4 nodes. The nodes have been identified in node set WarnNodeSolvProbZeroPiv_3_1_1_3_1.
Solver problem. Zero pivot when processing D.O.F. 1 of 5 nodes. The nodes have been identified in node set WarnNodeSolvProbZeroPiv_1_1_1_4_1.
Solver problem. Zero pivot when processing D.O.F. 2 of 5 nodes. The nodes have been identified in node set WarnNodeSolvProbZeroPiv_2_1_1_4_1.
Solver problem. Zero pivot when processing D.O.F. 3 of 3 nodes. The nodes have been identified in node set WarnNodeSolvProbZeroPiv_3_1_1_4_1.
![DI$N{)9{N95GO6`C$F]15@2.png](https://img.jishulink.com/upload/202104/eaa09f8b25444ff2aef16f1b67d1bac9.png "DI$N{)9{N95GO6`C$F]15@2.png")
SnowWave02 
