亿万紧急！！！跪求各位老师
本人在完成硕士论文的最后攻坚阶段遇到如下问题百思不得其解，特来求救，详情如下：对象为钢结构抗火模拟，已经完成了温度荷载的加载，进入结构分析阶段使用TB,MISO输入钢材在不同温度下的应力应变曲线，
进入计算提示如下4条错误：
for material 1 at temperature 500（以下分别为700、800、900）,the initial slope of the stress_strain curve
based on the tb ,miso table (1.7025E+10)(以下分别为3.1625+E9、1.5125E+9、3)is less than ex (1.26e+11）(以下分别为2.73E+10、1.89E+10、1.4175E+10)
不知是何原因，完全进行不下去，请指明路，所剩时间不多，日不餐，夜无眠……
命令流如下：
!取10个温度点，每个温度点由三个应力－应变点描述
/PREP7
FY=275E+6
EXX=2.1E+11
MPTEMP,,20,100,200,300,400
MPDATA,EX,1,,exx,exx,0.9*exx,0.8*exx,0.7*exx
MPTEMP,,500,600,700,800,900
MPDATA,EX,1,,0.6*exx,0.31*exx,0.13*exx,0.09*exx,0.0675*exx
MP,NUXY,1,0.3
MP,ALPX,1,1.4E-5
TB,MISO,1,10,3
!20度对应的应力－应变关系
TBTEMP,20
TBPT,,FY/EXX,FY
TBPT,,0.02,FY
TBPT,,0.15,FY
!100度对应的应力－应变关系
TBTEMP,100
TBPT,,FY/EXX,FY
TBPT,,0.02,FY
TBPT,,0.15,FY
!200度对应的应力－应变关系
TBTEMP,200
TBPT,,0.807*FY/(0.9*EXX),0.807*FY
TBPT,,0.02,FY
TBPT,,0.15,FY
!300度对应的应力－应变关系
TBTEMP,300
TBPT,,0.613*FY/(0.8*EXX),0.613*FY
TBPT,,0.02,FY
TBPT,,0.15,FY
!400度对应的应力－应变关系
TBTEMP,400
TBPT,,0.420*FY/(0.7*EXX),0.420*FY
TBPT,,0.02,FY
TBPT,,0.15,FY
!500度对应的应力－应变关系
TBTEMP,500
TBPT,,0.360FY/(0.6*EXX),0.360*FY
TBPT,,0.02,0.780*FY
TBPT,,0.15,0.780*FY
!600度对应的应力－应变关系
TBTEMP,600
TBPT,,0.180*FY/(0.310*EXX),0.180*FY
TBPT,,0.02,0.470*FY
TBPT,,0.15,0.470*FY
!700度对应的应力－应变关系
TBTEMP,700
TBPT,,0.075FY/(0.130*EXX),0.075*FY
TBPT,,0.02,0.230*FY
TBPT,,0.15,0.230*FY
!800度对应的应力－应变关系
TBTEMP,800
TBPT,,0.050FY/(0.090*EXX),0.050*FY
TBPT,,0.02,0.110*FY
TBPT,,0.15,0.110*FY
!900度对应的应力－应变关系
TBTEMP,900
TBPT,,0.0375FY/(0.0675*EXX),0.0375*FY
TBPT,,0.02,0.060FY
TBPT,,0.15,0.060FY
回复 楼主 daliu626 的帖子
这个TB参数有问题，随着温度的增加TBPT定义的ex应该比初始的ex值大。 尽快修改标题
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