我在ETABS中 复制标准层（最下面一层为大底盘地下室） 建模后运行，运行完成后结构信息中的X向层刚度由下往上出现递增，且有几层的Y向曾刚度为0，不知是何原因，请高手们赐教！不胜感激！

STORY30 SPECXY 2.307E+07 1.652E+06 No 1.000
STORY29 SPECXY 2.422E+07 1.438E+06 No 1.000
STORY9-19 SPECXY 2.381E+07 0.000E+00 No 1.000
STORY9-18 SPECXY 2.345E+07 0.000E+00 No 1.000
STORY9-17 SPECXY 2.314E+07 0.000E+00 No 1.000
STORY9-16 SPECXY 2.287E+07 0.000E+00 No 1.000
STORY9-15 SPECXY 2.264E+07 0.000E+00 No 1.000
STORY9-14 SPECXY 2.245E+07 0.000E+00 No 1.000
STORY9-13 SPECXY 2.228E+07 0.000E+00 No 1.000
STORY9-12 SPECXY 2.214E+07 0.000E+00 No 1.000
STORY9-11 SPECXY 2.202E+07 0.000E+00 No 1.000
STORY9-10 SPECXY 2.190E+07 0.000E+00 No 1.000
STORY9-9 SPECXY 2.178E+07 0.000E+00 No 1.000
STORY9-8 SPECXY 2.165E+07 0.000E+00 No 1.000
STORY9-7 SPECXY 2.152E+07 0.000E+00 No 1.000
STORY9-6 SPECXY 2.137E+07 0.000E+00 No 1.000
STORY9-5 SPECXY 2.121E+07 0.000E+00 No 1.000
STORY9-4 SPECXY 2.102E+07 0.000E+00 No 1.000
STORY9-3 SPECXY 2.081E+07 0.000E+00 No 1.000
STORY9-2 SPECXY 2.056E+07 0.000E+00 No 1.000
STORY9-1 SPECXY 2.027E+07 0.000E+00 No 1.000
STORY9 SPECXY 1.991E+07 0.000E+00 No 1.000
STORY8 SPECXY 1.946E+07 1.492E+06 No 1.000
STORY7 SPECXY 1.701E+07 1.702E+06 No 1.000
STORY6 SPECXY 1.648E+07 2.131E+06 No 1.000
STORY5 SPECXY 1.519E+07 2.701E+06 No 1.000
STORY4 SPECXY 1.238E+07 3.278E+06 Yes 1.250
STORY3 SPECXY 1.004E+07 4.593E+06 Yes 1.250
STORY2 SPECXY 3.580E+06 7.409E+06 No 1.000
STORY1 SPECXY 5.934E+07 4.388E+07 No 1.000