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Recent content by dog2k5

  1. dog2k5

    ABAQUS convergence problems

    Hello all: I am running a cyclic displacement loading on a steel I-beam. I put the loading protocol in the amplitude manager. I have displacements of -.275, .275, -.5, .5 ,-.156, .156 etc (the displacements are all in inches). I run the analysis. when I plot the displacement vs. the time...
  2. dog2k5

    Modelling a Buckling restrained brace

    Hello all, I am modeling a one story bay using a buckling restrained brace. this is a brace that as the name implies is restrained from buckling. There is an inner core made of steel. It is encased by concrete and then an outer tube made of steel. there is a debonding agent around the inner...
  3. dog2k5

    Contact between two surfaces

    I have model where a bolt is bounded on both the nut and head by fixed supports. the bolt starts in the middle of a hole in a steel rectagular plate. I have defined the two surfaces (bolt shank and inside of the hole on the plate) with no separation after contact.) I establish initial BC in...
  4. dog2k5

    Singularity in the assembly

    Another easy question. My model is as follows. I have a bolt fixed at both ends (nut and bolt head. the bolt goes through a whole in a plate. The whole is bigger than the bolt shaft. (the bolt and plate are two different parts) When I run the model I get a warning message in the .msg file...
  5. dog2k5

    overclosed

    I have a simple question. What does it mean if something is overclosed? Thanks. I wish I didn't need such help but my boss has left me to learn abaqus solo and I don't know much about finite element programs. Still learning the basics.
  6. dog2k5

    surface contacts

    My main concern is modeling bolt slip. I have the experimental data and need to match the results of my model to it. So I would think the bolts would need to be modeled in detail unless couple can take into account when the bolts would slip. if there is a way around modeling the bolts in...
  7. dog2k5

    surface contacts

    How do you model the surfaces for bolts. do I create surfaces for the bolt shank and the inside of the plates where the shank makes contact? Do I model the surfaces between the nut and the surface it touches as well as the bolt head and the surface it touches? If so how do I do it? I have...
  8. dog2k5

    bolt loading in ABAQUS

    I checked through the examples and didn't see anything to useful but I may be missing something. The one I did see modeled the bolt and other part as just one part. My problem is trying to model the bolt as a separate part so I can model bolt slip. The other thing I don't understand is how to...
  9. dog2k5

    bolt loading in ABAQUS

    To all: I have been very unsuccessful up to this point at modeling a bolt load. The following thread was kind of useful: thread799-87731 but didn't explain everything. Could someone give me a brief step by step of the order in which things should be done (ie what step the bolt load should be...
  10. dog2k5

    Numerical singularity error

    The nodes appear to be around the bolt hole. Should I add constraints there or would making a finer mesh help? thanks again
  11. dog2k5

    Numerical singularity error

    I am trying to using the bolt load option in the load module. It is a simple model with a bolt and nut connecting two plates. Each plate is being pulled by a concentrate force. When I run the model the program gives me warning messages that there are numerical singularities on three nodes...
  12. dog2k5

    Bolt load error

    I am currently modeling bolted connection in steel beams. I am using ABAQUS 6.4. When I try to write me input file I get the following error message. "Some normals of the bolt section surface for the following bolt loads do not form an acute angle with the bolt axis." What does this...
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