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  1. lippie

    Buckling Stress Concentration

    A possible solution is to create a dense mesh of elements in the vicinity of the stress concentration region. In finite element models, loads flow from point to point through element nodes. So, a more refined mesh in that location enables the load to flow to a wider area. You can simply select...
  2. lippie

    Staad gives axial load in girder of a simple bridge?

    The axial load is most likely caused by the Poisson effect. When the web of the girder is subjected to an inplane loading, Poisson effect will cause the web to undergo a deformation along the axis of the beam. Depending on how the supports are positioned, it can induce an axial force. To avoid...
  3. lippie

    horizontal distribution of seismic forces

    Are u assuming that the rigid diaphragm is like a slab and should attract all the mass? If so, where should they be lumped? At the master node? What if the rigid diaphragm covered only part of the floor?
  4. lippie

    Moment Diagrams

    nrguades In SAP, I dont know - I have just heard. We use STAAD 2003 and the option is inside the INI file. They don't expose it through the graphical side because according to their people at the REI Conference, "Tech Support would be confused if they were looking at bending moment diagrams...
  5. lippie

    Moment Diagrams

    I agree with Focht3...there should be an option. STAAD and SAP both allow you to draw the bending moment on the tension side (as positive) or compression side (as positive).
  6. lippie

    Recommend shape properties software

    STAAD has something called Sectionwizard (www.reiworld.com) and I think there is one offered by Enercalc.
  7. lippie

    GLB Trusses

    Our subs use STAAD for glulam projects. Sometimes they use WoodWorks as well.
  8. lippie

    STAAD Wind Load Generator

    EXCLUDE actually excludes all joints you don't want to be included in forming panels where the wind will be distributed. EXPOSURE allows you to specify how much intensity will be applied at a joint or level.
  9. lippie

    Partially Restrained Connections

    Are you looking at how to design them or model them? We typically model them in STAAD using what they called partial moment releases. THis is basically a connection where you define a percentage of fixity rather than a spring constant. It works really well.
  10. lippie

    Modeling vibration in structures- software?

    STAAD has the ability to input force or accel vs. time and is good for modeling vibration of multiple equipments at different arrival times.
  11. lippie

    Two users one developing model, one preparing drawings

    Are u looking for software that can do that? May want to try Tekla Structures (www.tekla.com).
  12. lippie

    GTSTRUDL,sap2000,etabs,staad which is better

    Not true. Anyway, STAAD III is from 1996. STAAD.Pro is their latest software. Roadmanpd...verify for yourself...go to http://www.reiworld.com/support/pro/Verification.pdf They have examples on dynamics as well. Do your own research.
  13. lippie

    How to Calculate Partial Fixity Spring Constant?

    You can use partial moment releases in STAAD.Pro. Under Releases, you can specify MPX, MPY or MPZ as a percentage of full fixity (50%, 80%, etc.). This is called a semi-rigid connection. Much easier than defining a spring.
  14. lippie

    I-beam torsional stress calculation

    Torsion is tough. You have two types of stresses. Normal and warping. Normal is fairly easy to calculate for open sections as long as you have the torsional stiffness (J). Warping is the tough one - you have warping bending and shear stresses. To calcualte the warping constant for a random open...
  15. lippie

    STAAD's footing design

    Are you using the STAAD.etc component? If so, did you set your min and max lenghts to be in the range you were looking for?
  16. lippie

    Creating a Staad model for blast Loading

    Use a time history analysis in STAAD to simulate a blast. They have a new program called STAAD.foundation that can take the results of your analysis and design the mat.
  17. lippie

    Nonlinear cable analysis programs

    May want to check our STAAD, LARSA or STRUDL. STAAD and LARSA habe now combined companies. www.reiworld.com.
  18. lippie

    StaadEtc foundation design results

    There is an option in the reinforcement page to "not" choose top reinforcement which I guess is more for shirnk, creep or temperature.
  19. lippie

    How to design the slab in slab-wall structure using ETABS results?

    Try using STAAD.foundation from REI. This has a good compatiability between their main 3D analysis program and slab on grade design. I also use ETABS and STAAD. I wish those two programs would talk to each other as well since each one has its good points on certain types of models.
  20. lippie

    Odd shaped footings

    STAAD.pro has an automatic spring support generator for exactly what you are looking for.

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