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用ANSYS做了一個工字鋼的熱分析，程序能跑起來，但是一直有WARNING

The thermal transient analysis has no mass.

不知道哪里出的問題，求大神解釋！！

下附命令流：

Finish

/clear

!---------------------------------熱分析部分-----------------------------

/prep7

/title,part1:heat transfer analysis

ET,1,SHELL131 !定義單元類型

!--------------------------------幾何建模------------------------------------

L=3400$B=175$H=240$TW=8$TF=12 !工字型截面定義

WPROTA,,90$BLC4,,,B,L$AGEN,2,1,,,,H !建立翼緣面

WPROTA,,,90$wpoffs,,,B/2$BLC4,,,H,L !建立腹板面

NUMMRG,ALL !黏合面

!---------------------------------材料參數(shù) ---------------------------

R,1$R,2 !腹板翼緣厚度實常數(shù)

MP,DENS,7.85E-6 !鋼材密度

!-----------------------------熱工參數(shù)定義------------------------

mptemp,1,0,20,100,200,300

mptemp,6,400,500,600,700,800

mptemp,11,900,1000,1100,1200

mpdata,kxx,1,1,0.0533,0.0533,0.0507,0.0473,0.044 !定義熱傳導系數(shù)

mpdata,kxx,1,6,0.0407,0.0374,0.034,0.0307,0.0274

mpdata,kxx,1,11,0.0273,0.0273,0.0273,0.0273

mpdata,c,1,1,440,440,488,530,565 !定義比熱容

mpdata,c,1,6,606,667,760,1008,803

mpdata,c,1,11,650,650,650,650

!-------------------------------材料賦予---------------------------

ASEL,S,,,1,2

SECTYPE,1,SHELL

SECDATA,TF

AATT,1,1,1,,1 !翼緣板

ASEL,S,,,3

SECTYPE,1,SHELL

SECDATA,TW

AATT,1,2,1,,1 !腹板

ALLSEL,ALL

!-----------------------------------劃分網(wǎng)格--------------------

ESIZE,50$MSHKEY,1

AMESH,ALL

FINISH

!------------------------------------求解---------------------

/solu

antype,trans

tunif,20 !初始溫度

AUTOTS,on !定義自動時間步

DELTIM,20 !初試時間步

stef,5.67E-14 !波茨曼常數(shù)

arfa1=25e-6 !對流熱傳導系數(shù)

temp1=20

allsel,all

SFA,all,,CONV,arfa1,temp1 !施加初始熱對流

!################熱對流、熱輻射#######################

*do,tm,300,5400,300 !時間，1.5h

time,tm

test_temp=20+345*(LOG10(8*tm/60+1)) !環(huán)境空氣溫度

SFA,all,,CONV,arfa1,test_temp !施加熱對流

nsla,s !施加熱輻射

sf,all,rdsf,0.5,1

spctemp,1,test_temp

stef,5.67e-14

AUTOTS,on

toffst,273

allsel,all

solve

*enddo

FINISH

!---------------------保存溫度------------------

/POST1

PLNSOL,TBOT,,0,

FINISH

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