*** FATAL ***                           CP =     928.234   TIME= 17:12:44

 The supplied nonlinear material properties produced an incorrect        

 material tangent matrix.  Please check your TB input carefully.  A      

 very small yield stress may cause this failure.                         

我的混凝土（C45）材料定義命令流：

mp,ex,1,33600e6   

mp,prxy,1,0.2

mp,dens,1,2200

tb,concr,1

tbdata,,0.5,0.95,ft,-1

tb,miso,1,,14

tbpt,,0.0001,3.36e6

tbpt,,0.0002,6.64e6

tbpt,,0.0003,9.79e6

tbpt,,0.0004,12.74e6

tbpt,,0.0005,15.47e6

tbpt,,0.0006,17.95e6

tbpt,,0.0007,20.15e6

tbpt,,0.0009,23.77e6

tbpt,,0.0011,26.37e6

tbpt,,0.0013,28.11e6

tbpt,,0.0015,29.15e6

tbpt,,0.0017,29.64e6

tbpt,,0.00185,29.74e6

tbpt,,0.0036,29.74e6

采用的是整體式建模方式

困擾小弟我好久了，非常郁悶，無從下手的感覺

希望大家能夠給予我一些指點，非常感謝！拜托了！