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  1. StoyanAndreev

    SSI with distributed spring-dashpots, NIST/NEHRP provisions

    Hi, guys! I need to model soil-structure interaction for a large building (approx 68x68x70 meters). I am using NIST GCR 12-917-21 "Soil-structure interaction for building structures" as a reference document. I have calculated lumped spring-dashpot coefficients for vertical translations...
  2. StoyanAndreev

    Time period from undrained to drained

    From Duncan and Wright "Soil strength and slope stability": A practical measure of this time is t99, the time required to achieve 99% of the equilibrium volume change, which for practical purposes, we consider to be equilibrium. Using Terzaghi’s theory of consolidation, we can estimate the...
  3. StoyanAndreev

    Hydraulic properties of clayey soil

    Yes, they are independent. But they are dependent on anisotropy in hydraulic conductivity. And in this case study the incoming floods are intense but rather short in duration - about 4h30m so it is conservative to assume steady-state seepage conditions.
  4. StoyanAndreev

    Hydraulic properties of clayey soil

    Hi guys! Currently I am involved in a benchmark project for the ICOLD (International Committee for Large Dam) for risk assessment of an embankment dam. One of the failure modes is of course sliding instability of the downstream slope. For the project a very simple approach is proposed for the...
  5. StoyanAndreev

    GEO-SLOPE Workshop

    My question is if there is anybody in the forum who participated in past GEO-SLOPE Workshops in Canada or in Europe and if they found them usable. I am GeoStudio 2012 user for about an year and a have and I am not sure if the topics are beginner- or higher level.
  6. StoyanAndreev

    Tornado Missile Impact

    The structural team I work for is currently assessing a structure for tornado loading. Since most civil code have little or no information on tornadoes other than hazard maps we are using the US NRC Reg Guide 1.76 Design-Basis Tornado and Tornado Missiles for Nuclear Power Plants. Regarding the...
  7. StoyanAndreev

    33Hz Fundamental freqnency

    This depends on the type of loading, its frequency content, the structure you are analyzing and the type of analysis. If you have a seismic loading on a dam or a levee you need to take into account maximum frequencies up to about 10-15 Hz. If you have a standard building without valuable...
  8. StoyanAndreev

    Vortex Shedding in Eurocode

    Thank you pikku14, I was thinking the same thing, but I needed confirmation, because it is a bit unclear written IMO.
  9. StoyanAndreev

    Vortex Shedding in Eurocode

    I am performing strength and deflections checks of an existing 150 m tall RC concrete chimney with varying cross section according to Eurocodes. In EN1991-1-4 (Wind Loading) we can find this text: E.1.2 Criteria for vortex shedding (1) The effect of vortex shedding should be investigated when...
  10. StoyanAndreev

    Mesh size for dynamic analyses

    Considering the Kuhlemeyer and Lysmer criterion to transmit a maximum frequency fmax the mesh size should be L<C/(10fmax), where C is the wave velocity. My question is if I am using second-order finite elements (8-node rectangular for example)what is L - the size of the FE or the distance...
  11. StoyanAndreev

    Textbook on retrofit of earth retention walls

    I think that there are no vertical cracks, these are just some water stains on the plaster. As for the thermal expansion - it is a possible source, but I think that in this case there must be some cracks on the other leg of the corner and there are none. For the main suspect - settlement - I...
  12. StoyanAndreev

    Textbook on retrofit of earth retention walls

    I was thinking for diagonal rod also, but my structural analyses of the wall have shown that in this case the crack are just moving closer to the center of the wall. There is no survey of the site, but in the whole area the top layers are clays with small hydraulic conductivity. In the last two...
  13. StoyanAndreev

    Textbook on retrofit of earth retention walls

    FixedEarth, thank you once again, this approach looks very good. But the problem is that the wall is almost on the street so there is no place for new concrete. And the other thing is that the wall has enough bearing capacity for the cantilever moments, the problem is diagonal cracking because...
  14. StoyanAndreev

    Textbook on retrofit of earth retention walls

    FixedEarth, thank you for your advices. In this particular case I'm working on right now it seems that the problem is structural. There is too little reinforcement in the front face of a inverted T cantilever wall which encloses a slope from three sides. Because of the stiffening effect of these...
  15. StoyanAndreev

    Calculation of frequency-dependent impedance functions for SSI

    Thank you Mccoy! I have some idea for the work of Wolf & Deeks but haven't used Cone models up to now. I've downloaded the program, and I am looking forward to buy a paper or digital copy of the book.
  16. StoyanAndreev

    Textbook on retrofit of earth retention walls

    Can you recommend me a good textbook on retrofit and strengthening of earth retention walls? I need something more graphic - with examples and different design approaches rather than just calculations.
  17. StoyanAndreev

    Out of plane cross brace stability

    I am not familiar with the code you're using, but is this 0.004P a uniform loading all over the column or concentrated force?
  18. StoyanAndreev

    Lateral restraints for trusses

    I found the procedure in Eurocode 3 - it is based on the initial arc imperfection of the chord in lateral direction. The uniform lateral force is qd=8*(e0+d)*Ned/(L^2) where Ned is the compression force, L is the length of the chorc, e0 is the arc imperfection and d is the deformation due to...
  19. StoyanAndreev

    VIBRATION DESIGN

    What are you designing? What vibration criteria are you wanting to implement?
  20. StoyanAndreev

    Lateral restraints for trusses

    In Eurocode 3 (EN 1993) is there a procedure to calculate the reactions in lateral restraints of compressive members (columns, truss chords) or compressive flange of beams? I am currently designing a single-story industrial building and I want to use the purlins as lateral restraints of the...

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