lhr1435 发表于 2007-7-5 10:25:58

求助 关于弹簧单元的边界问题

这是我做的关于承台的例子，我在承台底部加了弹簧单元来模拟桩土作用，我是加的竖向约束，只限制其竖向位移，但在计算时，出现模型倒塌了，可能是弹簧单元出现问题，但不知如何改动，求助各位大侠。

D:\cab0\1.dat
Starting Job on Thu Jul 05 09:40:21 2007
Checking prerequisite files...
Maximum memory allowed for solution = 455.8 mb
Initializing ... Stage 1
Initializing ... Stage 2
Allocating 455779736 bytes of memory ...
Starting Solution Process ...
Computation starts ...
Input phase...
Available memory for ADINA without sparse solver -   455.8 mb
Estimated storage by ADINA without sparse solver -    22.4 mb
Assemblage of linear matrices.
Calculate and store the load vector
Re-allocating 22066020 bytes of Memory ...
Initial contact penetration,contact group    1,no. of penetrating nodes      33
Storage used by the sparse solver (in-core) -   142.0 mb
Total storage occupied by the ADINA program -   164.0 mb
*** Stiffness matrix not positive definite ***               
node=      5559 equation=      5116dof= Z-TRANSLATIONpivot= -1.42443771E+01
node=   14239 equation=   30930dof= X-TRANSLATIONpivot=0.00000000E+00
node=   14239 equation=   30931dof= Y-TRANSLATIONpivot=0.00000000E+00
node=   14240 equation=   30933dof= X-TRANSLATIONpivot=0.00000000E+00
node=   14240 equation=   30934dof= Y-TRANSLATIONpivot=0.00000000E+00
node=   14241 equation=   30936dof= X-TRANSLATIONpivot=0.00000000E+00
node=   14241 equation=   30937dof= Y-TRANSLATIONpivot=0.00000000E+00
node=   14242 equation=   30939dof= X-TRANSLATIONpivot=0.00000000E+00
node=   14242 equation=   30940dof= Y-TRANSLATIONpivot=0.00000000E+00
node=   14242 equation=   30941dof= Z-TRANSLATIONpivot=0.00000000E+00
node=   14243 equation=   30942dof= X-TRANSLATIONpivot=0.00000000E+00
node=   14243 equation=   30943dof= Y-TRANSLATIONpivot=0.00000000E+00

Stiffness matrix not positive definite,boundary conditions or model collapsed
*** ERROR NO. A1002 ***                                                      

Stiffness matrix not positive definite,boundary conditions or model collapsed
ENDCODE=1                                                                     
*** Program stopped abnormally ***Please see the *.out file for details.


Error encountered ...
Releasing network license ...
Job Canceled on Thu Jul 05 09:40:59 2007

jlzly159 发表于 2010-9-1 18:24:04

我也是这个问题。不知道楼主是否解决了？

lhjhh1973 发表于 2010-9-3 11:23:02

弹簧单元如何添加？

武汉游侠 发表于 2010-9-5 19:04:59

弹簧刚度不够或约束不足
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