staad常出警告信息

1 **** ERROR: DEPTH AT START NOT PROVIDED. ****
在开始不提供厚度

2 *** ERROR *** ABOVE LINE CONTAINS ERRONEOUS DATA.
上面的行包含错误的数据

3 **ERROR- IN READING MEMBER PROPERTIES. CHECK DATA FORMAT CAREFULLY.
在阅读成员属性。仔细检查数据格式

4 ***WARNING - INSTABILITY AT JOINT 8 DIRECTION = MY
PROBABLE CAUSE SINGULAR-ADDING WEAK SPRING
K-MATRIX DIAG= 1.8595238E+01 L-MATRIX DIAG= -3.5527137E-15 EQN NO770
***NOTE - VERY WEAK SPRING ADDED FOR STABILITY
**NOTE** STAAD DETECTS INSTABILITIES AS EXCESSIVE LOSS OF SIGNIFICANT

DIGITS DURING DECOMPOSITION. WHEN A DECOMPOSED DIAGONAL IS LESS THAN

THE BUILT-IN REDUCTION FACTOR TIMES THE ORIGINAL STIFFNESS MATRIX

DIAGONAL， STAAD PRINTS A SINGULARITY NOTICE. THE BUILT-IN REDUCTION FACTOR IS 1.000E-09

THE ABOVE CONDITIONS COULD ALSO BE CAUSED BY VERY STIFF OR VERY WEAK ELEMENTS AS WELL AS TRUE SINGULARITIES.

这个警告说明您的模型中有节点失稳现象，请您首先消除不稳定模型，一般是出现几何可变体系了
把平面结构以空间结构的方式进行计算，通常会出现平面外失稳的警告，可以试试将输入命令的第一行STAAD SPACE 改为STAAD PLANE 看看结果如何。还有看看节点输入参数的精度，如果以mm为单位一般不要小数点，一连串平行于坐标轴的节点在垂直于该轴平面的两个坐标是否都是绝对一样。