ansys_concrete

Ansys 混凝土本构模型

Ansys中混凝土通常使用Solid65单元，可以使用的本构模型有：

等强硬化模型（Mulitilinear Isotropic Hardening）
随动硬化模型（Multilinear Kinematic Hardening）
DP模型（Drucker-Prager）

在等强硬化模型中，初始弹模应等于第一点的斜率。

典型的混凝土本构模型定义为：

FC = 116E6
FT = FC/10
ET,1,Solid65
MP,EX,1,63375000
MP,PRXY,1,0.2
KEYOPT,1,1,0
KEYOPT,1,7,1
TB,CONCR,1
TBDATA,,0.5,0.95,FT,FC
TB,MISO,1,,18
TBPT,,0,63.81
TBPT,,0.000004,89.16
TBPT,,0.00007,111.35
TBPT,,0.000232,116
TBPT,,0.000724,104.19
TBPT,,0.002073,62.25
TBPT,,0.003474,30.48
TBPT,,0.004784,16.03
TBPT,,0.005919,10.37
TBPT,,0.006997,7.52
TBPT,,0.008834,4.99
TBPT,,0.01142,3.32
TBPT,,0.13989,2.47
TBPT,,0.016552,1.96
TBPT,,0.02039,1.5
TBPT,,0.024225,1.21
TBPT,,0.028057,1.01
TBPT,,0.030612,0.92

在实际应用中，因为下降段的斜率小于0，会导致错误。

TB,MISO table for material 2 at temperature 0 has a tangent slope value less than zero.   

所以可以将下降段去掉，然后重新调整混凝土的破坏准则。

Ansys中混凝土材料的参数表为：
Constant（常数） Meaning（含义）
1 Shear transfer coefficients for an open crack.（开裂时的剪切转移系数）
2 Shear transfer coefficients for a closed crack.（闭合时的剪切转移系数）
3 Uniaxial tensile cracking stress.（单轴拉伸开裂应力）
4 Uniaxial crushing stress (positive).（单轴压缩破坏应力）
5 Biaxial crushing stress (positive).（双轴压缩破坏应力）
6 Ambient hydrostatic stress state for use with constants 7 and 8.（环境静水压应力）
7 Biaxial crushing stress (positive) under the ambient hydrostatic stress state (constant 6).(环境静水压应力下的双轴压缩破坏应力)
8 Uniaxial crushing stress (positive) under the ambient hydrostatic stress state (constant 6).(环境静水压应力下的单轴压缩破坏应力)
9 Stiffness multiplier for cracked tensile condition, used if KEYOPT(7) = 1 (defaults to 0.6).(开裂时的刚度系数)