ANSYS中使用COMBIN39单元的实例

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!定义参数和单元类型 !混凝土参数 *SET,hntra,20.5 *SET,ec,28800 *SET,possible,0.3 *SET,hntrl,2.35

!FRP参数

*SET,ff,1800 !抗拉强度

*SET,ef,220000 !弹性模量 !FRP纤维布的极限拉应变 *SET,ckf,ff/ ef !FRP厚度 *SET,tf,0.121*2

et,1,solid65 !混凝土单元 KEYOPT,1,1,1 !不考虑大变形

KEYOPT,1,7,1 !考虑应力松弛，有助于计算收敛

et,2,link8 !钢筋单元 et,3,shell43 !模拟frp布 et,4,solid45 !刚性垫块 !定义实常数

r,1,50.3 !纵向受拉钢筋实常数 r,2,28.3 !纵向受压钢筋，箍筋实常数 r,3 !混凝土 R,4,tf,tf,tf,tf,,, !frp的实常数 RMORE,,

r,5 !垫块

ET,5,COMBIN39 !法向弹簧 keyopt,5,1,0 keyopt,5,2,1 KEYOPT,5,3,3

r,6,0,0,0.0005,29340,0.001,41577 !粘结滑移关系 rmore,0.005,92970,0.01,131478,0.015,161028 rmore,0.02,185939,0.025,207886,0.029214,224725

!定义材料属性

mp,ex,1,ec !混凝土材料属性 mp,prxy,1,possible tb,conc,1 !混凝土自带的破坏准则

tbdata,,0.5,0.9,hntrl,-1

!混凝土本构关系 tb,miso,1,,23

tbpt,,0.000005,hntra*0.0074627 tbpt,,0.00001,hntra*0.00992537 tbpt,,0.00005,hntra*0.0491293 tbpt,,0.0001,hntra* 0.0970149 tbpt,,0.0002,hntra*0.19 tbpt,,0.0004,hntra*0.36 tbpt,,0.0006,hntra*0.51 tbpt,,0.0008,hntra*0.64 tbpt,,0.0010,hntra*0.75 tbpt,,0.0012,hntra*0.84 tbpt,,0.0014,hntra*0.91 tbpt,,0.0016,hntra*0.96 tbpt,,0.0018,hntra*0.99 tbpt,,0.0020,hntra*1.00 tbpt,,0.0022,hntra*0.98 tbpt,,0.0024,hntra*0.97 tbpt,,0.0026,hntra*0.95 tbpt,,0.0028,hntra*0.93 tbpt,,0.003,hntra*0.92 tbpt,,0.0032,hntra*0.9 tbpt,,0.0034,hntra*0.88 tbpt,,0.0036,hntra*0.87 tbpt,,0.0038,hntra*0.85

mp,ex,2,1.94e5 mp,prxy,2,0.3 tb,bkin,2,1,2,1 tbdata,,368.3,2000

mp,ex,3,1.97e5 mp,prxy,3,0.3 tb,bkin,3,1,2,1 tbdata,,410.6,2000

!定义FRP mp,ex,4,ef mp,prxy,4,0.3

!纵向受拉钢筋横向箍筋，受压钢筋材料属性 !mp,ex,5,ec !垫块材料属性 mp,prxy,5,possible !建模

blc4,,,100,200,-1100 k,9,20,40,0 !钢筋 k,10,20,40,-1100 l,9,10 lgen,2,13,,,60 lsel,s,line,,13,14 LPLOT CM,zlj,LINE allsel,all

lgen,2,13,,,,120 lgen,2,14,,,,120 lsel,s,line,,15,16 lplot cm,zyj,line allsel,all

k,17,20,40,-500 !箍筋 k,18,80,40,-500 k,19,20,160,-500 l,17,18 l,17,19

lgen,2,17,,,,120 lgen,2,18,,,60 lsel,s,line,,17,20,1 LPLOT *do,ii,1,5

lgen,2,17,20,1,,,-ii*100 ii=ii+1 *enddo LPLOT cm,gj,line

WPAVE,0,0,0 !CFRP

wprota,,90 !旋转工作平面yz，90°

wpoffs,,,0.835 !偏移工作平面z cfrp面与混凝土面之间距离为0.835mm blc4,,,100,-1000

wpoffs,,,-0.835 !支座面与cfp下表面距离为0.835mm wpoffs,,-1100

blc4,,,100,100,20 !支座处混凝土垫块100*100*20 wpoffs,,600 wpoffs,,,-200 wprota,,-90

blc4,,,100,20,-100 !荷载处混凝土垫块是100*100*20 allsel,all

!划分单元

VSEL,s,volu,,1 !混凝土网格划分较细为25*50*25 VATT,1,3,1 LSEL,s,line,,12 LSEL,a,line,,7 LSEL,a,line,,8 LESIZE,12,50,,,,,,,0 LESIZE,7,20,,,,,,,0 LESIZE,8,20,,,,,,,0 MSHAPE,0,3D MSHKEY,1 VMESH,1

cmsel,s,zlj,line !主la筋划分为50mm lATT,2,1,2

LESIZE,all,50,,,,,,,0 LMESH,all

cmsel,s,zyj,line !主ya筋划分为50mm lATT,3,2,2

LESIZE,all,50,,,,,,,0 LMESH,all

cmsel,s,gj,line !箍筋为20mm lplot lATT,3,2,2

LESIZE,all,20,,,,,,,0 LMESH,all

asel,s,area,,7 !CFRP划分单元为四边形20*50 aplot AATT,3,4,3 lsel,s,,,42 lsel,a,,,43

LESIZE,42,50,,,,,,,0

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