ANSYS混凝土柱滞回为什么曲线是直线，是本构的问题还是模型的问题？
/CLEAR
/PREP7
AS0=615.44$AS1=78.5
ET,1,SOLID65
KEYOPT,1,1,0 !考虑大变形
KEYOPT,1,5,1 !线性解输出控制：给出每个积分点的解
KEYOPT,1,6,3 !非线性解输出控制：给出每个积分点的解
KEYOPT,1,7,1 !开裂后考虑应力松弛，有助于计算收敛
MP,EX,1,2.4E4$MP,PRXY,1,0.2$FC=25
TB,CONCR,1,1,9$TBDATA,,0.35,0.75,3.1125,-1
TB,MISO,1,,15
TBPT,,0.0002,4.8$ TBPT,,0.0004,9.375$ TBPT,,0.0006,13.51
TBPT,,0.0008,17.02$ TBPT,,0.001,19.83$ TBPT,,0.0012,21.95
TBPT,,0.0014,23.43$ TBPT,,0.0016,24.365$ TBPT,,0.0018,24.856
TBPT,,0.002,25$ TBPT,,0.0038,25$TBPLOT
MP,EX,2,2E5$MP,PRXY,2,0.25$TB,BISO,2$TBDATA,,360
MP,EX,3,2E5$MP,PRXY,3,0.25$TB,BISO,3$TBDATA,,210
!体积配筋率
R,1,3,AS1/(70*100),0,0,2, AS0/(70*70)$RMORE,90,0,3, AS1/(70*100),0,90
R,2,3, AS1/(70*100),0,90
R,3,3, AS1/(70*100),0,0
R,4
!实常数最多只能有六项，后六项需添加RMORE
BLC4,,,500,1500,500
WPOFFS,,,70$VSBW,ALL
WPOFFS,,,360$VSBW,ALL
WPROTA,,,90$WPOFFS,,,70$VSBW,ALL
WPOFFS,,,360$VSBW,ALL
VSEL,S,LOC,X,0,70$VSEL,R,LOC,Z,0,70
VATT,1,1,1$MSHAPE,0,3D$MSHKEY,1$LESIZE,ALL,70$VMESH,ALL$ALLSEL
VSEL,S,LOC,X,430,500$VSEL,R,LOC,Z,0,70
VATT,1,1,1$MSHAPE,0,3D$MSHKEY,1$LESIZE,ALL,70$VMESH,ALL$ALLSEL
VSEL,S,LOC,X,0,70$VSEL,R,LOC,Z,430,500
VATT,1,1,1$MSHAPE,0,3D$MSHKEY,1$LESIZE,ALL,70$VMESH,ALL$ALLSEL
VSEL,S,LOC,X,430,500$VSEL,R,LOC,Z, 430,500
VATT,1,1,1$MSHAPE,0,3D$MSHKEY,1$LESIZE,ALL,70$VMESH,ALL$ALLSEL
VSEL,S,LOC,X,0,70$VSEL,R,LOC,Z, 70,430
VATT,1,2,1$MSHAPE,0,3D$MSHKEY,1$LESIZE,ALL,120$VMESH,ALL$ALLSEL
VSEL,S,LOC,X,430,500$VSEL,R,LOC,Z, 70,430
VATT,1,2,1$MSHAPE,0,3D$MSHKEY,1$LESIZE,ALL,120$VMESH,ALL$ALLSEL
VSEL,S,LOC,X,70,430$VSEL,R,LOC,Z, 0,70
VATT,1,3,1$MSHAPE,0,3D$MSHKEY,1$LESIZE,ALL,120$VMESH,ALL$ALLSEL
VSEL,S,LOC,X,70,430$VSEL,R,LOC,Z, 430,500
VATT,1,3,1$MSHAPE,0,3D$MSHKEY,1$LESIZE,ALL,120$VMESH,ALL$ALLSEL
VSEL,S,LOC,X,70,430$VSEL,R,LOC,Z, 70,430
VATT,1,4,1$MSHAPE,0,3D$MSHKEY,1$LESIZE,ALL,120$VMESH,ALL$ALLSEL
!/DEVICE,VECTOR,1
!$/ESHAPE,1.0
!$/REPLOT
NSEL,S,LOC,Y,0
D,ALL,ALL
/SOLU
ANTYPE,0
NLGEOM,ON
OUTRES,ALL,ALL
AUTOTS,OFF
CNVTOL,F,,0.1,2,0.9
TIME,1$NSUBST,20
NSEL,S,LOC,Y,1500
D,ALL,UX,1
ALLSEL
SOLVE
TIME,2$NSUBST,40
NSEL,S,LOC,Y,1500
D,ALL,UX,-1
ALLSEL
SOLVE
TIME,3$NSUBST,40
NSEL,S,LOC,Y,1500
D,ALL,UX,2
ALLSEL
SOLVE
/POST26
NSOL,2,491,U,X
RFORCE,3,491,F,X
XVAR,2
PLVAR,3
PRVAR,2,3
pgh312 
