坚持实干、坚持一线、坚持积累、坚持思考，坚持创新。
小伙伴的ETABS模型，遇到问题，直接计算，报错，提示”THE STRUCTURE IS UNSTABLE OR ILL-CONDITIONED!!”，提示结构不稳定。
最近在测试ETABS，由于太久没用ETABS，总是各种问题，已经是第4次遇到这个问题：
* * * W A R N I N G * * *
THE STRUCTURE IS UNSTABLE OR ILL-CONDITIONED !!
CHECK THE STRUCTURE CAREFULLY FOR:
– INADEQUATE SUPPORT CONDITIONS, OR
– ONE OR MORE INTERNAL MECHANISMS, OR
– ZERO OR NEGATIVE STIFFNESS PROPERTIES, OR
– EXTREMELY LARGE STIFFNESS PROPERTIES, OR
– BUCKLING DUE TO P-DELTA OR GEOMETRIC NONLINEARITY, OR
– A FREQUENCY SHIFT (IF ANY) ONTO A NATURAL FREQUENCY
TO OBTAIN FURTHER INFORMATION:
– USE THE STANDARD SOLVER, OR
– RUN AN EIGEN ANALYSIS USING AUTO FREQUENCY SHIFTING (WITH
ADDITIONAL MASS IF NEEDED) AND INVESTIGATE THE MODE SHAPES
同时提示 Lost Accuracy 丢失精度.
后仔细检查，是底部墙肢约束不足导致
- 相关博文 ( Related Posts)
[01]. ETABS 2015人工波功能初步测试(一)
[02]. ETABS 2015人工波功能初步测试(二)
[03]. [Tool][软件] ETABS组合截面建模工具[Tool for creating composite section in ETABS]
[04]. ETABS 2016转YJK(盈建科)提示“未找到质量源工况”
[05]. [软件][工具][Programming][ETABS]ETABS E2K Timehistory Extractor [ETABS E2K时程提取软件]
[06]. [Tool][软件][编程] ECM: ETABS Concrete Modifier[ETABS混凝土材料修改器]
[07]. [Midas][ETABS] 框架时程分析对比(ETABS vs. midas Gen)
[08]. SAP2000截面设计器中截面分析实例 [Sectional Analysis Example in SAP2000 Section Designer]
[10]. SAP2000 API 二次开发初探
[11]. [ETABS][结构分析] ETABS v9 模态分析模态数量的设置
[12]. [ETABS][编程][工具] ETABS快速指定刚性隔板 (Rigid Diaphram)
[13]. [ETABS][结构分析] ETABS提示”Error saving text file Separator Wall Desing – Erro No.9 索引超出了数组界限”无法保存模型的处理办法
[14]. [结构优化][编程][软件] 基于ETABS二次开发的结构优化设计程序及其在实际工程中的应用
[15]. [结构][分析][ETABS] ETABS V9中的楼层质量
[16]. [ETABS] ETABS2016剪力墙网格划分尺寸 (Auto Rectangular Mesh Setting for Walls)
[17]. [ETABS][组合截面] ETABS中通过截面设计器定义的组合截面 (ETABS v9 and ETABS 201x) (ETABS Section Designer)
[18]. [ETABS] ETABS警告”THE STRUCTURE IS UNSTABLE OR ILL-CONDITIONED!!”
[19]. [ETABS] ETABS警告”THE STRUCTURE IS UNSTABLE OR ILL-CONDITIONED!!” (Case 2)
[20]. [ETABS] ETABS警告”THE STRUCTURE IS UNSTABLE OR ILL-CONDITIONED!!” (Case 3)
- 微信公众号 ( Wechat Subscription)
欢迎关注 “结构之旅” 微信公众号
