桩基收敛问题

吃草的兔兔

本人菜鸟，建了一个桩基模型，模型采用D-P模型，分析步仅为地应力一步，未做平衡（后面平衡问题想在inp文件修改），主要问题可能是不收敛。当我把材料属性改为弹性时，就能算出结果，我对D-P模型里面的参数修改了很多次，还是失败。请各位大牛帮忙看看是什么问题。（文件太大，不知道怎么上传，下面是主要部分）




*Heading
** Job name: 2010-8-2-2#dun Model name: Model-1
** Generated by: Abaqus/CAE Version 6.8-1
*Preprint, echo=NO, model=NO, history=NO, contact=NO
**
** PARTS
**
*Part, name=ban
*Node
      1,           0.,           2.,   3.29999995
      2,           0.,           0.,   3.29999995
      3,           0.,           0.,   1.20000005
      4,           0.,           2.,   1.20000005
      5,   1.40999997,           0.,   3.29999995
      6,   1.40999997,           2.,   3.29999995
      7,  0.785000026,           0.,   1.20000005
      8,   1.40999997,           0.,   1.82500005
。。。。。。。。。。。。。。。。。。。。
  88271,  88272,  88273,  88274,  88275,  89382,  89383,  89384,  89385,  92144,  92145,  92146,  92147,  92429,  92430,  92431
  92432,  97589,  97590,  97591,  97592,  97766, 102577, 102578, 102579, 102580, 102623, 102624, 102625, 102626, 103231, 103232
103233, 103234, 106945, 106946, 106947, 106948, 113121, 113122, 113123, 113124, 113125, 113126, 126307, 126308, 126309, 126310
126311, 126312, 126313, 126314, 126315, 126316, 126317, 126318, 126319, 126320, 126321, 126322, 126323, 126324, 126325, 126326
126327, 126328, 126329, 126330, 140643, 141702, 141703, 141704, 141705, 146326, 146327, 146328, 146329, 146330, 146331, 146332
146333, 146334, 146335, 146336, 146337, 146338, 146339, 146340, 146341, 147818, 150794, 150795, 150796, 150797, 150798, 150799
150800, 150801, 150802, 150803, 150804, 150805, 150806, 150807, 150808, 150809, 150810, 150811, 150812, 150813, 150814, 150815
150816, 150817, 158448
*Surface, type=ELEMENT, name=tu-zhuang
_tu-zhuang_S3, S3
_tu-zhuang_S4, S4
_tu-zhuang_S2, S2
*Elset, elset=_tu-zhuangdi_S2, internal, instance=tu-1-2-3-4-5-6-7-1
139332, 139333, 139334, 141150, 141151, 141152, 155358, 155359, 155360, 157585, 157586, 157587, 157591, 157592, 157593, 157597
157598, 157599
*Elset, elset=_tu-zhuangdi_S3, internal, instance=tu-1-2-3-4-5-6-7-1
145792, 145797, 147800, 147801, 157606, 157608
*Elset, elset=_tu-zhuangdi_S4, internal, instance=tu-1-2-3-4-5-6-7-1
145791, 145793, 145798, 145799, 147799, 157607
*Surface, type=ELEMENT, name=tu-zhuangdi
_tu-zhuangdi_S2, S2
_tu-zhuangdi_S3, S3
_tu-zhuangdi_S4, S4
*Elset, elset=_jiazaimian_S2, internal, instance=dun-1
  49,  50,  51,  52,  53,  54,  55,  56,  57,  58,  59,  60,  61,  62,  63,  64
  97,  98,  99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112
*Elset, elset=_jiazaimian_S4, internal, instance=dun-1, generate
  3,  48,   3
*Elset, elset=_jiazaimian_S6, internal, instance=dun-1, generate
145,  190,    3
*Surface, type=ELEMENT, name=jiazaimian
_jiazaimian_S2, S2
_jiazaimian_S4, S4
_jiazaimian_S6, S6
** Constraint: dun-ban
*Tie, name=dun-ban, adjust=yes
ban-dun, dun-ban
** Constraint: zhuang-ban
*Tie, name=zhuang-ban, adjust=yes
ban-zhuang, zhuang-ban
** Constraint: zhuangdi-tu
*Tie, name=zhuangdi-tu, adjust=yes
tu-zhuangdi, zhuangdi-tu
*End Assembly
*Amplitude, name=Amp-1
          0.,           0.,          0.5,          0.5,           1.,           1.
**
** MATERIALS
**
*Material, name=tu-1
*Density
1800.,
*Drucker Prager
22., 0.9,  5.
*Drucker Prager Hardening
15000.,0.
*Elastic
2.5e+07, 0.38
*Material, name=tu-2
*Density
1700.,
*Drucker Prager
16., 0.9,  5.
*Drucker Prager Hardening
10000.,0.
*Elastic
1.5e+07, 0.4
*Material, name=tu-3
*Density
2200.,
*Drucker Prager
20., 0.9,  8.
*Drucker Prager Hardening
30000.,0.
*Elastic
5.5e+07, 0.36
*Material, name=tu-4
*Density
2400.,
*Drucker Prager
22., 0.9,  8.
*Drucker Prager Hardening
850000.,0.
*Elastic
8e+09, 0.34
*Material, name=tu-5
*Density
2500.,
*Drucker Prager
24., 0.9, 12.
*Drucker Prager Hardening
1.1e+06,0.
*Elastic
2.2e+10, 0.3
*Material, name=zhuang-ban-dun
*Density
2400.,
*Elastic
2.5e+10, 0.2
**
** INTERACTION PROPERTIES
**
*Surface Interaction, name=ban-tu-2
1.,
*Friction
0.,
*Surface Interaction, name=bandi-tu-2
1.,
*Friction
0.,
*Surface Interaction, name=banshang-tu-1
1.,
*Friction
0.,
*Surface Interaction, name=dun-tu-1
1.,
*Friction
0.,
*Surface Interaction, name=zhuang-tu
1.,
*Friction, slip tolerance=0.005
0.2,
*Surface Behavior, no separation, penalty
*Surface Interaction, name=zhuangdi-tu
1.,
*Friction
0.,
**
** BOUNDARY CONDITIONS
**
** Name: BC-1 Type: 对称/反对称/完全固定
*Boundary
_PickedSet37, XSYMM
** Name: BC-2 Type: 对称/反对称/完全固定
*Boundary
_PickedSet40, ZSYMM
** Name: BC-3 Type: 对称/反对称/完全固定
*Boundary
_PickedSet41, ENCASTRE
**
** INTERACTIONS
**
** Interaction: ban-tu-2
*Contact Pair, interaction=ban-tu-2, type=SURFACE TO SURFACE
tu-2-ban, ban-tu-2
** Interaction: bandi-tu-2
*Contact Pair, interaction=bandi-tu-2, type=SURFACE TO SURFACE
tu-2-bandi, bandi-tu-2
** Interaction: banshang-tu-1
*Contact Pair, interaction=banshang-tu-1, type=SURFACE TO SURFACE
tu-1-banshang, bans-tu-1
** Interaction: dun-tu-1
*Contact Pair, interaction=dun-tu-1, type=SURFACE TO SURFACE
tu-1-dun, dun-tu-1
** Interaction: zhuang-tu
*Contact Pair, interaction=zhuang-tu, type=SURFACE TO SURFACE
tu-zhuang, zhuang-tu
** ----------------------------------------------------------------
**
** STEP: diyingli-1
**
*Step, name=diyingli-1, nlgeom=YES
*Geostatic
**
** LOADS
**
** Name: zhongli-1   Type: Gravity
*Dload, amplitude=Amp-1
_PickedSet42, GRAV, 9.8, 0., -1., 0.
**
** OUTPUT REQUESTS
**
*Restart, write, frequency=0
**
** FIELD OUTPUT: F-Output-1
**
*Output, field, variable=PRESELECT
**
** HISTORY OUTPUT: H-Output-1
**
*Output, history, variable=PRESELECT
*End Step


模型最后失败原因为：Fixed time increment is too large
Abaqus/Standard Analysis 由于出错而退出 - 如果 消息 文件存在, 请从该文件中获得可能的错误消息.


警告为：THE SLAVE SURFACES ASSEMBLY_TU-2-BAN AND ASSEMBLY_TU-2-BANDI INTERSECT EACH OTHER. THEY ARE PAIRED WITH MASTER SURFACES ASSEMBLY_BAN-TU-2 AND ASSEMBLY_BANDI-TU-2 THAT ALSO INTERSECT EACH OTHER. IF BOTH PAIRS ARE *CONTACT PAIRs, THESE TWO PAIRS SHOULD NOT BE SIMULTANEOUSLY PRESENT IN A STEP BECAUSE OF POSSIBLE CONVERGENCE PROBLEMS; USE *MODEL CHANGE,TYPE=CONTACT PAIR TO REMOVE ONE OF THEM. IF BOTH ARE *TIE PAIRS, THE REDUNDANT TIES WILL BE REMOVED AUTOMATICALLY. IF ONE PAIR IS *TIE AND ANOTHER IS *CONTACT PAIR, REMOVE ONE OF THEM.
THE SLAVE SURFACES ASSEMBLY_TU-2-BAN AND ASSEMBLY_TU-1-BANSHANG INTERSECT EACH OTHER. THEY ARE PAIRED WITH MASTER SURFACES ASSEMBLY_BAN-TU-2 AND ASSEMBLY_BANS-TU-1 THAT ALSO INTERSECT EACH OTHER. IF BOTH PAIRS ARE *CONTACT PAIRs, THESE TWO PAIRS SHOULD NOT BE SIMULTANEOUSLY PRESENT IN A STEP BECAUSE OF POSSIBLE CONVERGENCE PROBLEMS; USE *MODEL CHANGE,TYPE=CONTACT PAIR TO REMOVE ONE OF THEM. IF BOTH ARE *TIE PAIRS, THE REDUNDANT TIES WILL BE REMOVED AUTOMATICALLY. IF ONE PAIR IS *TIE AND ANOTHER IS *CONTACT PAIR, REMOVE ONE OF THEM.
For *tie pair (assembly_ban-dun-assembly_dun-ban), adjusted nodes with very small adjustments were not printed. Specify *preprint,model=yes for complete printout.
For *tie pair (assembly_ban-zhuang-assembly_zhuang-ban), adjusted nodes with very small adjustments were not printed. Specify *preprint,model=yes for complete printout.
For *tie pair (assembly_tu-zhuangdi-assembly_zhuangdi-tu), adjusted nodes with very small adjustments were not printed. Specify *preprint,model=yes for complete printout.
OVERCONSTRAINT CHECKS: THERE ARE 16355 BOUNDARY CONDITIONS SPECIFIED IN THIS MODEL. OVERCONSTRAINT CHECKS FOR BOUNDARY CONDITIONS SPECIFIED ON SLAVE NODES OF RIGID BODIES, OF *TIE OPTIONS, OR OF *COUPLING OPTIONS REQUIRE 6 Mb OF MEMORY. IF THIS IS A PROBLEM, PLEASE TURN OFF OVERCONSTRAINT CHECKS USING *CONSTRAINT CONTROLS, NO CHECKS or INCREASE THE MEMORY USED BY THE PRE-PROCESSOR.
The plasticity/creep/connector friction algorithm did not converge at 95 points

吃草的兔兔

1# 吃草的兔兔
这个模型已经困扰我很久，请各位大牛帮忙看看

sadmet

当你采用接触分析时，就是非线性分析，初始增量步要设置小点，不然无法建立接触，你可以先把桩杀死，然后约束土体桩孔周围的侧向位移，接触什么都不要，然后再算地应力。如果还有什么问题可以联系我qq343270411

复仇者

楼上正解。

复仇者

楼上正解。

lvk19861029

我也想知道