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  1. asiga

    Good book for programming computational geotechnical analysis?

    Hi! Is there some good book you'd recommend for implementing computer codes for numerical analysis (read: FEM, finite differences, and/or their relatives) of geotechnical analysis (specially topics related to buildings, such as: settlement, soil failure, slope stability, seepage, altering the...
  2. asiga

    Usual English word for a building code replacing an older one?

    Hi! I'm not able to find what's the most common word in English to describe the act of an older building code being annulled by a newer code. In Spanish we say that the older code has become "derogado". Searching Wordreference, it suggests "repeal", "abrogate" or "abolish" as translations to...
  3. asiga

    U-value of air? Why 25 W/m2K?

    Oh, what a big variation of values across authors... @TiCl4: I need the thermal diffusivity too, because there's also a fluid simulation going on, with air-to-air transfer. My initial interest was to relate both values (air-to-air and air-to-surface), in order to avoid redundancy in the input...
  4. asiga

    U-value of air? Why 25 W/m2K?

    But you said "I believe the general recommendation of 25 W/m2K is the recommendation for heat transfer to surfaces because the thermal boundary layer for air is usually the governing resistance to heat transfer. People have run these calculations for a variety of reasons and found this to be a...
  5. asiga

    U-value of air? Why 25 W/m2K?

    That was it, thanks a lot. So, in conclusion, it seems it makes sense to have two different inputs: one, the thermal diffusivity for the fluid simulation, and two, the U-value for considering the air-to-surface transfer within the thermal boundary layer, and consider them as independent and...
  6. asiga

    U-value of air? Why 25 W/m2K?

    Ok, ok, point taken about the thickness. However, forget about the U-value for a moment, because there's another problem that seems to come first: the thermal conductivity of air seems to be anyway in the order of 25 W/mK instead of the 0.0258565 W/mK that I'm getting in my calculations above...
  7. asiga

    U-value of air? Why 25 W/m2K?

    Why don't you see a relationship? U and k are related. And alpha and k are related. Therefore, alpha and U are related. That's what I was doing in my post.
  8. asiga

    U-value of air? Why 25 W/m2K?

    I've been told to assume that the U-value of air is 25 W/m2K. However, in other calculations I'm using the thermal diffusivity of the same volume of air (2.208*10-5 m2/s at 30ºC), and, since both values are related, I'd rather prefer to obtain the U-value from the thermal diffusivity, so that my...
  9. asiga

    About the energy equation for temperature in CFD

    Hi, I'm implementing a simple CFD simulator following the book "Numerical Simulation in Fluid Dynamics - A Practical Introduction" by Griebel/Dornseifer/Neunhoeffer and I was obtaining the weird behaviour that temperature was changing in the fluid just because of velocity gradients (I mean, the...
  10. asiga

    The global cubes algorithm by Immel et al: Is it a particularization of discrete ordinates?

    There are situations where the overlap of knowledge and research between radiative heat transfer and radiosity confuses me. While radiosity (a computer graphics technique) was developed using radiative heat transfer as its base ground (acknowledged fact by the early/pioneering radiosity...
  11. asiga

    Is "development length" more popular than "anchorage length" in the US?

    Thanks a lot for your drawing and explanation, KootK, but now I really don't understand how you calculate the "anchorage length". A quick thought: maybe you call "development length" to what we call "basic anchorage length" (which depends on just the concrete strength, the steel yield...
  12. asiga

    How do you usually call each set of extra bars when doing curtailment of reinforcement?

    When extra bars from curtailed reinforcements are cut-off at different points, how do you usually call each "set" of extra bars that have the same length? "Set"? "Family"? "Bundle"? For example, at the picture above, would you say that there are three (sets/families/bundles/or what?) of...
  13. asiga

    Is "development length" more popular than "anchorage length" in the US?

    Perhaps the reason for these different approaches is that, for us (Europe), bond is made of three causes: 1) molecular forces (adhesion), 2) mechanical friction at the steel/concrete interface, 3) mechanical interlock in the compressed struts at the ribs. If I'm understanding you correctly...
  14. asiga

    Is "development length" more popular than "anchorage length" in the US?

    I understand, although I feel a bit surprised about how things are treated differently at each side of the Atlantic. I think the key point is how much concrete thickness are you talking about when you say "the reinforcement rips from the parent concrete, taking a chunky cone of concrete with it...
  15. asiga

    Is "development length" more popular than "anchorage length" in the US?

    Oh, maybe you call it "development" when it's about a straight rebar, and "anchorage" when you use a standard bend/hook? If that's the case, I can understand your will to argue they are different, but we have always considered both within a homogeneous formulation (with coefficients that...
  16. asiga

    Is "development length" more popular than "anchorage length" in the US?

    In the EC-2, the anchorage length is the length that a reinforcement needs for the stress to be transferred safely to concrete (ie: without failure of the bond). There's no "development length" in the EC-2. And, when I read its meaning in US books, it's the same meaning as the anchorage length...
  17. asiga

    Is "development length" more popular than "anchorage length" in the US?

    Coming from Europe, I'm very used to the term "anchorage length" (and in fact I've never seen it called "development length" in my day to day environment). Now, reading some RC books published in the US, I see they tend to prefer "development length" (and... doing an Internet search, I even...
  18. asiga

    RC T-beam: Conditions for limiting likeliness of lateral buckling

    Nevermind: just got the confirmation that hs is actually hf (it's a typo in modern editions of the book, while it was supposedly correct in older editions).
  19. asiga

    RC T-beam: Conditions for limiting likeliness of lateral buckling

    The conditions shown above, meant for limiting lateral buckling in T-shaped beams, are from a very popular RC book in Spain, popularly known as the "Jiménez Montoya", where all terms are defined in the book, except for hs (hf is the flanges thickness, h is the beam total depth, bw is the web...
  20. asiga

    How do you call the "chamfers" between web and flange in a RC T-beam?

    Thanks a lot for all your replies!! I like taper, haunches, and perhaps eased internal corner... but I need to think better about what term I choose :-) @BAretired: You're right that the translation from "cartabón" is "square", but, to be more exact it's not a square, but the ruler with the 30...

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