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  1. BeFEA

    A scaled finite element model

    Hello! I have a question that I would like to share with you. Although there is little chance to encounter this problem in practice, I think it is good for a structural engineer to pause and ponder about it for a few seconds. For me, it is actually a real-life problem. Here it goes: - Let's...
  2. BeFEA

    Riddle-like question

    Hello! I have a question for you. I am not sure myself about the answer, but I have some analysis results that make me totally confused. Therefore, the question will look like a quiz-show question or a riddle. Here it goes: - Let's consider two buildings with the same fundamental period, say...
  3. BeFEA

    Linear vs nonlinear time history analysis

    Hello! Speaking conceptually/ theoretically, when should the deformations be smaller: in a linear time history analysis or in a nonlinear time history analysis? Let's assume everything else is exactly the same in both analyses, just the type of analysis changes.
  4. BeFEA

    Displacements at Ultimate Limit State (Eurocode 8)

    Hello! Does Eurocode 8 impose a limit on displacements for the Ultimate Limit State? I know it does for the Damage Limitation state, but I think it should be necessary to check deformations for the ultimate limit state as well. Does someone have information about this? What about other seismic...
  5. BeFEA

    Park and Ang damage index

    Hello everyone! Does any of you have experience with the Park and Ang damage index? I am struggling to understand the real meaning of "dE - incremental absorbed energy", thought it seems to be an easy parameter. Let's say I have the force - deformation relationship of a structural element...
  6. BeFEA

    OpenSees or Sap2000 or Abaqus?

    Hello! I have recently started to use OpenSees (currently I am still a beginner). I have two questions for your: -besides the obvious advantages in cost and automation (especially useful for parametric studies), are there other advantages of OpenSEES compared to Sap2000, in terms of modeling and...
  7. BeFEA

    Sap2000 vs. OpenSEES

    Hello everyone! I am in a research environment and I can't afford a license for Sap2000. Therefore, I have started to use OpenSees (currently I am still a beginner). I was wondering: -besides the obvious advantages in cost and automation (especially useful for parametric studies), are there...
  8. BeFEA

    nonlinear link with coupled stiffness

    In Sap2000, it is possible to model coupled stiffness for linear links (Link type: Linear). Is it possible to do something similar for nonlinear links? If it isn't possible in Sap2000, do you know any other software that can help me with this?
  9. BeFEA

    Unbalanced moment in punching design (Eurocode 2)

    Hi everyone! I have a basic question. When you design a slab-column joint for punching shear in Eurocode 2, in the equation of the factor betta: - should MEd (the unbalanced moment) be calculated using an elastic linear analysis? Never mind seismic actions at this moment, let's assume that...
  10. BeFEA

    A very basic nonlinear FEA

    Hello! I am trying to break though the nonlinear domain in Finite Element Analysis. However, everything I find on the Internet is either too long or too complicated. I was wondering if someone could explain me a very simple nonlinear model (for example, a nonlinear spring fixed at one end and...
  11. BeFEA

    Usage of shearheads in flat slabs

    Dear All! I was wondering if someone of you has experience in using "shearheads" for punching shear resistance in flat slabs. My actual question is: Are shearheads commonly used in Europe? According to guide ACI 421.2R-10, shearheads are not common in North America, even though the ACI code...
  12. BeFEA

    Superelevation in CSI Bridge/Sap2000 keeping the girders in vertical position

    Hi! Is it possible to achieve superelevation of the deck of a bridge in CSI Bridge (or older versions of SAP2000) by inclining the top slab while keeping the girders vertical? I see that the option to superelevate the deck rotates the girders as well (but I don't want this to happen). I am...
  13. BeFEA

    how to develop influence surfaces for a simply supported one way slab

    Hi everyone, I want to find the function f(x,y) that represents the values of influence surface (for, let's say, bending moments at mid-span) of a simply supported slab. The slab is supported only on two edges (one way slab). After I have f(x,y), I will be able to calculate the slab for moving...
  14. BeFEA

    How can I extract information for a sub-structure in Sap2000 in a modal analysis?

    I have developed a simple Finite Elements Method application for windows. Among others, it performs modal analysis of sub-structures (let's say, 4 interconnected elements out of 20 elements in total). Is there any way to force Sap2000 to display results based on a pre-defined substructure so I...
  15. BeFEA

    pushover analysis of a shell with variable local axes

    I want to run a pushover analysis in which the local axes of shell elements change from step to step. I know that it is impossible to run a single pushover analysis during which the local axes of shell elements change their angle. However, I would like to know your opinion regarding any other...
  16. BeFEA

    define hinges in Sap2000 using OAPI

    Hi everyone! Is there a OAPI function to define hinges in Sap2000 and to assign them to frames? When I search for "hinge" in the OAPI documentation, I only get functions that read the properties of existing hinges, but I can not create new ones. Thank you in advance! Brisid
  17. BeFEA

    Real time extraction of results from a pushover analysis in Sap2000

    Hi! I am currently running a pushover analysis for a very complex model. The analysis lasts for approximately two days. I have lost a few days re-running the analysis after I find out something wrong at the results. I would like to know if there is any possibility to view the results in "real...
  18. BeFEA

    modal analysis of an oscillator with non uniform stiffness in tension/compression

    I am trying to find the fundamental period of a special oscillator which consists of a mass attached to a spring that has stiffness k1 in compression but stiffness k2 in tension. Is there any way to model this behavior in Finite Elements Method? I can not even think of a hand solution. Can...

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