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  • Users: magudfe
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  1. magudfe

    Soil stress beneath strip footings

    I used Es=58Mpa for the mat, Es=80 for strip; Poisson ratio m=0,3. "Vesic's formula does not account for influence factors due to the geometry of the setup", do you mean that I should consider the Steinbrenner factor?
  2. magudfe

    Soil stress beneath strip footings

    The differential settlement restriction are severe. Moreover the upper structure is rigid, therefore even if I separate the two foundation, the rigidity of the upper structure will let the strip footings follow the mat. Regarding k I'm using the Vesic theory indicated in Bowles "Foundation...
  3. magudfe

    Soil stress beneath strip footings

    Thanks, yes I am doing it, but the problem is that the subgrade modulus [force/lenght^3] depends not only on the soil layer below, but also on the width of the foundation. Bigger is the width, smaller is k value. This is why I find k values so different for strip and for mat. Once defined k, I...
  4. magudfe

    Soil stress beneath strip footings

    Below the soil layers encountered: -top sands (from 0 level to -2.5m) -quaternary sands medium dense to dense with deformation modulus Es=70-90MPa (from -2.5m to -12m) -clayey quaternary sands with deformation modulus Es=60-80MPa (from -12m to -14m) -sandy loam (weak soil properties) with...
  5. magudfe

    Soil stress beneath strip footings

    Hi, I have the following problem designing the foundation of a structure composed by an heavy loaded part connected to a lighter part. The heavy loaded part of the structure is based on a mat foundation. The other part is based on strip footings. The strip footings are connected to the mat...
  6. magudfe

    Concrete Cracking Stress vs. Fatigue

    Maybe you can check this article "Fatigue of normal weight concrete and lightweight concrete" http://www.sintef.no/static/BM/projects/EuroLightCon/BE3942R34.pdf In paragraph 4.3.3 you can find a reference to Model Code 1990, regarding the failure of concrete subjected to fatigue load under...
  7. magudfe

    Shear strength acc. ACI 318R-02

    Check in ACI 318-05 (SI units), you will find: 11.3.1.1, Equation 11-3 Vc = 0.17(?f'c)bwd 11.5.7.9: Vs = 0.66(?f'c)bwd
  8. magudfe

    Factor used to modify development lenght

    Thanks to all for the clarification, this is a concept not included in the standard i usually follow for design.
  9. magudfe

    Factor used to modify development lenght

    Dear Colleagues, can anyone explain to me what is the meaning of the factor used to modify development lenght based on reinforcement location in 12.2.4.a (ACI 318-05) "Where horizontal reinforcement is placed such that more than 300mm of fresh concrete is cast below the development lenght or...
  10. magudfe

    Footing Base Rotation

    In order to evaluate the rotation of a footing base, it can be used the formula given by Bowles taking into account the modulus of soil, base dimesions, applied maximum moment and the Influence factor (that is different for rigid or flexible bases). The rotation valueas that I obtain are 2 times...

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