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  1. luungoclinh

    Cohesive element

    Hi, I am new in Abaqus. I am trying to simulate the crack propagation using cohesive element. I do the simple test with model having 2 element plus a layer made by cohesive element in the middle subjected to tension load. I expect to see "virtually" the crack at the cohesive element layer...
  2. luungoclinh

    export internal forces from C shape shear wall

    Hi all, Could someone please tell me what people normally do to export internal forces from monolithic RC C shape shear walls using Etabs that will be used for sectional analysis? Will you define 3 piers for C shape (web + 2 flanges) or only one pier? If there is only one pier, how do you...
  3. luungoclinh

    weak story irregularity

    Could anyone please tell me how to check the weak story irregularity in Etabs? Thanks
  4. luungoclinh

    Strengthen shear capacity of an existing reinforced concrete shear wall

    Dear all, I need to seismic rehabilitation for an existing reinforced concrete shear wall in the matter of shear capacity. Could you please suggest a a solution for that? Adding more shear wall is not possible in my case, so should I use steel sheet, fibre reinforced polymer...or ?? I am...
  5. luungoclinh

    Static equivalent force procedure in Etabs

    Dear all, I am doing static equivalent force procedure for my shear wall building (no column is considered) in Etabs, but only for 2D analysis. I conduct 2 studied cases: one without eccentricity and the other with eccentricity of 0.1. I use the same response spectra for two cases. The...
  6. luungoclinh

    Considering P-delta effect in Etabs

    Hi, I want to consider P-delta effect in my shear wall building. I want all lateral force is resisted only by the shear walls, so I release rotational degree slab column connection. I do the modal analysis, and Etabs inform me that there are negative stiffness in my columns. Could someone...
  7. luungoclinh

    Slab using membrane of shell elements

    Hi, Could anyone please explain to me which degree of freedom that I should constraint for a rigid floor using shell and membrane elements?. I mean that, for example, I have a rigid diaphragm floor using shell element, and is that similar if I constraint this floor in both horizontal (H1,H2)...
  8. luungoclinh

    Accidental torsion in Etabs

    Hi all, I have an asymmetrical building with two cores. I want to consider accidental torsion in my model. I use the option to input eccentricity ratio in defining response spectrum case data in Etabs. I understand that, if I following this, I will consider accidental torsion for different...
  9. luungoclinh

    base shear force for building with basement

    Hi everybody, I am designing a shear wall building with 8 storey above ground level, and 2 story underground level. There are 2 cores in the building. The first core finishes at basement level 1, the second core finishes at basement level 2. My questions is where I should take the value...
  10. luungoclinh

    torsional vibration as mode 1 or 2

    Hi all, Could anyone explain to me why we need to avoid having a building where the torsional vibration is mode 1 or 2? In case that is unavoidable, what should we do? Thanks Lisu
  11. luungoclinh

    Auto line contraints between slabs and columns

    Hi all, I have a building with flat slab, and the columns are not located on the grid-lines. I use shell element for slab. I wonder about compatibility between the columns and the slabs, Does Etabs automatically generate auto line constraints between slabs and columns? Thanks Lisu
  12. luungoclinh

    Etabs model - Pier forces

    Hi, I have a reinforced concrete shear wall building. I am trying to model it in Etabs (attached file). The lateral load is supposed to resist by only the shear walls, thus I pin the columns at base.Now, I just apply a vertical load to the building, then I look at the pier forces (by looking...
  13. luungoclinh

    applying load in sequence: 1) gravity load; 2) seismic load

    Hi there, 1) Could some one tell me how I can define sequence of load applying to the building in Etabs 3D? I ask that question because I am familiar with another software like Perform 3D that I can define to apply gravity load firstly then seismic load. In Etabs, will it follow that...
  14. luungoclinh

    ASCE/SEI 41-06 - Unit - Shear thresholds

    Hi there, 1/Could someone tell me what are the units of V, f'c, bw and lw in Table 6-18: modelling parameters and numerical acceptance criteria for nonlinear procedures reinforced concrete shear walls and associated components controlled by flexure. Sorry for this stupid question...
  15. luungoclinh

    modelling for a RC building

    Hi all, I have questions regarding how to develop a numerical modelling of a reinforced concrete building (shear walls is the only seismic force resisting system) using Etabs 3D for seismic analysis. Actually the question is regardless the software that we use, but I am using etabs so I post...

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