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Recent content by concepto.ed

  1. concepto.ed

    Directional increase for fillet welds on moment connections

    Take a look at this article from the Steel Tube Institute: Link
  2. concepto.ed

    base plate and anchor rod capacity checks

    If you are using load combinations, you should have an axial load on the base plate. For your case axial load will be very small but it will allow you to calculate the eccentricity and everything else using large moment design criteria.
  3. concepto.ed

    "PTR" Acronym - HSS Section?

    In Mexico HSS square members are usually described as PTR (Profile Tube Rectangular). They are usually found in ASTM A500 (Grade B only) and ASTM A513. You may want to make sure they are ASTM A500.
  4. concepto.ed

    Fly brace supporting Purlin

    I agree that one could make it functional but no matter how we consider stability, load paths, torsional effects, etc, uncertainty will be higher than not consider the fly brace to act as a support. For me, it becomes too unpractically, it is best to use them for only one purpose, in most cases...
  5. concepto.ed

    Approximate building period formulas to check structural design software results

    I was also surprised. May be the ideal building, I will try to check other building models, some of them taller and with irregularities.
  6. concepto.ed

    Approximate building period formulas to check structural design software results

    Thank you all! I've run some numbers using a steel moment frame building I was working on. Six storeys (4m typical heigth), regular building, 10 m bays. See attached picture. First, I consider Rayleigh method as suggested by KootK and JoshPlumSE. This method has the advantage that is not very...
  7. concepto.ed

    Approximate building period formulas to check structural design software results

    In my experience, up to two times the one calculated using ASCE 7 formulas.
  8. concepto.ed

    Approximate building period formulas to check structural design software results

    Totally agree. Please let me clarify something, my intention is not to avoid the use of well-established methods in structural dynamics or to spread misinformation about something so important for seismic design. I just think that sometimes it is useful to have aids that help us define if the...
  9. concepto.ed

    Approximate building period formulas to check structural design software results

    Nowadays, checking results of structural design softwares is a very important task and using approximate formulas can save a lot of time. How do you deal with fundamental period of buildings depending on its structural system? Do you think it is a property that can be estimated during...
  10. concepto.ed

    ACI 318R19 Long term deflection factor and ultimate total deflection

    @ IDS and Agent666 Thank you very much for the clarification.
  11. concepto.ed

    ACI 318R19 Long term deflection factor and ultimate total deflection

    Hello! When calculating the total deflection of a RC beam according to ACI 318R19, I've followed this way: Obtain the inmediate deflection due to sustained loads (D1) and the incremental inmediate deflection due to that portion of the live load not sustained (D2). Then, to compute the ultimate...
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