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  • Users: ThomasH
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  1. ThomasH

    Torsional vibrations

    Hi everybody. I need a bit of help. I am helping two students with their master thesis and the subject is a hybrid timber structure. That means that the core is built with concrete and the remaining parts with timber. The problem is that there are torsional modes at relativly low frequencias...
  2. ThomasH

    Can I copy text in Femap?

    I need to do something that I have never done before in Femap. I have a view with several textboxes. What I would like to do is to duplicate them so I can edit the text in the boxes. The required end result is two textboxes at the same location with slightly different content. The boxes will be...
  3. ThomasH

    Sign post with risk for galloping (wind)

    Hi all, A colleague asked me something that I thought you might be able to help with. If you look at the very simple figure below there is a support column (black) with diameter 1 m and height 30 m. Then you have two signs (blue) that are ~15 m high and the total width for the two signs and the...
  4. ThomasH

    How du you think a good computer for FEM should be set up?

    Hello, I am looking into replacing my current computer with a new one. The existing computer is a HP Z840 and it was very good in 2015. Byt now I am looking at my options. I use Femap and primarily NX Nastran, combined with Adina. Now I plan to start with two SSD drives, 1 TB for OS and 1-2...
  5. ThomasH

    When is a concrete wall air tight?

    I am involved in a project where the client will test equipment. One test means that high altitude will be simulated and that means that the test room shall have a very low air pressure. That obviously means that walls and roof will get a high "load" due to the external pressure. But for things...
  6. ThomasH

    RFEM (Dlubal) question

    Hello, I don't know if there are any RFEM users in the forum but I ask anyway [smile]. The company I work for is considering RFEM as a tool for timber design. We have heard from colleagues that it is a good tool for this type of structure. Does anybody have any experience that they can share...
  7. ThomasH

    "matrix is not positive definite"-question

    Hi all, I have a problem with a model that I so far have been unable to figure out. It started with a fairly large model, but I also have smaller models for the same structure. I am trying to run a buckling analysis of a cable stayed bridge. I asked about this model here...
  8. ThomasH

    Buckling with Prestress

    Hello, I have a problem that I can't quite figure out. I am working on a cable stayed bridge and I need to calculate the buckling modes for the main girder. The problem is that I want to prestress the cables and then add a load that drives (varys) to cause the buckling. Prestressing is Load 1...
  9. ThomasH

    Buckling with focus on part of the model

    Hi all, I have a "problem" that I am fairly certain can be solved if if I don't know the answer myself [smile]. I am working with a rather large model (1 million+ nodes). It is a bridge and most of it is steel beams modelled with shell elements. One part of the analysis is to determine the...
  10. ThomasH

    Questing regarding the use of TMD dampers

    Hi all I have a project that involves the dynamic design of a slender beam. The structure is a pedestrian bridge and the span is ~ 90 m. In the figures below I have limited the geometry to the walkway. The issue is that the vertical acceleration for the first mode shape has been to high for a...
  11. ThomasH

    Connection for a moving floor

    Hello I have a question regarding someting that bugs me. I am designing a moving floor, basically a loading arrangement. I have a fixed part of the floor and the moving part of the floor rotates around the connection to the fixed floor. The moving floor can be flat but is more often an...
  12. ThomasH

    Fatigue in reinforced concrete

    Hi I have a question regarding reinforced concrete and fatigue. I am working on a structure where fatigue loading has proven to be an issue. The code I use is Eurocode but I am currently interested in a more general approach. The original idea was to strengthen the structure for ultimate...
  13. ThomasH

    Non-Linear Analysis on an imperfect structure

    Hi I am currently using non-linear analysis to find the load capacity on structures. The workflow is as follows: 1. Linear buckling analysis (Nastran) 2. Use the buckling shape and scale it to create a deformed structure (preprocessor Femap). 3. Run a non-linear analysis to find the load...
  14. ThomasH

    How would you design this Glulam beam?

    Hello I am working with something that has me wondering how others would view this issue. It concerns the glulam beam that you can see (simplified) in the figure bellow. It is a simply supported beam with an additional glulam "column" from 1 to 2. The blue lines are steel bars slightly...
  15. ThomasH

    A question regarding design for explosion

    Hi all, I have worked with explosion loads and the design for that purpose on and off for several years. But last week a got a odd problem. A client has a building and the process inside can explode if things go bad. The current solution is venting areas, hatches in the wall that will open for...
  16. ThomasH

    How to cancel the message window in non-linear analysis

    Hi all, I have a problem that irritates me. One reason is that I think I have solved it before but can't remember how. I am running a series of non-linear analysis's. Some complete and others don't due to convergence issues. That is ok because I am searching for a limit in the structure. But...
  17. ThomasH

    Wind loads on wall clock hands

    Hi all I got an odd question to deal with. It concerns the hands of a wall clock. I don't know the size of the clock but the length varies up to approximately 2 m. The clock can be in a church tower or something like that so it can be high. So I have a clock axis with two cantilevers that...
  18. ThomasH

    Temporary Structure in Florida and California

    Hello everybody I asked this question some time ago but now the project has "woken up" again and now I know the locations. It concerns a steel frame "box", four beams forming a rectangular floor (2.5 m x 6.0 m), four corner columns (total height 2.8 m) and four additional beams forming the...
  19. ThomasH

    Rules for temporary structure in the USA

    Hi all I have an existing design of a structure designed according to Eurocode, no specific annex, I used several different annexes and designed for worst case. It's an exhibition monter, basically a steel box. With roof (glass on steel beams), floor (glass on steel beams) and four corner steel...
  20. ThomasH

    Using Adina with Femap

    Hi I have been using Femap for many years now, always with Nastran as the solver. Different versions of Nastran but thats another story. I have no plan to stop using Nastran but I have become a bit curious regarding Adina. Basically, I have part of Adina as SOL 601/701 in NX Nastran but the...

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