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  1. BOCH

    Safe - Modelling Shear walls

    Are you talking about foundation model in SAFE exported from reactions at base from ETABS ? If so, yes the walls are exported as inverted beams with a null mass and weight in order not to duplicate the own weight that is considered as reactions at walls joints, and this way the rigidity of walls...
  2. BOCH

    HIGH DISPLACEMENT IN ETABS

    I couldn't open your model, something is wrong in the file. Have you checked in the analysis log file that nothing is un-stable and the model is not ill-conditioned ? There might be at some places two overlapping joints, one of them is connected to the surrounding shell elements and frame...
  3. BOCH

    Sandwich model theory in SAP2000

    Hi guys, The design of shell elements in SAP2000 is based on the sandwich model theory, which is cannot be applicable in case the core of the sandwich model is cracked due to transversal shear, in this case the formulas of the theory changes by accounting for an additional tension force in the...
  4. BOCH

    SAP beam designer dosen't account for axial tension/compression forces ?

    Hi guys, I have noticed that for a beam type frame element, SAP doesn't design for axial tension/compression forces in beams (M3 only) .. which is a bit weird since due to temperature and seismic loads, axial tension/compression forces in beams occurs and beams should be designed accordingly...
  5. BOCH

    Young modulus reduction E/2 in thermal loading

    Hello guys, when designing a structure subjected to thermal loading, the young modulus of concrete is reduced by 50%, E/2, to count for the cracking effect in the concrete due to this loading and hence to reduce the amount of internal stresses and reinforcement in the concrete section, otherwise...
  6. BOCH

    Young modulus reduction E/2 in thermal analysis

    Hello guys, when designing a structure subjected to thermal loading, the young modulus of concrete is reduced by 50%, E/2, to count for the cracking effect in the concrete due to this loading and hence to reduce the amount of internal stresses and reinforcement in the concrete section, otherwise...
  7. BOCH

    Non-Convergence of time history cases - Instability and ill conditioned structure

    Thanks LQQD, I have tried to run the model in version 17.3.0, the instability issue have disappeared however the convergence issue for triplet time history cases with triple pendulum is still there ..
  8. BOCH

    Non-Convergence of time history cases - Instability and ill conditioned structure

    Hi LQQD, is it possible to re-run the model with version 17 since it is already saved and modified in version 18 ? Hi Shz713, thanks I will have a look at these issues.
  9. BOCH

    Non-Convergence of time history cases - Instability and ill conditioned structure

    Yes I tried this but I haven't seen the any errors, it looks to me like the advanced solver .. Maybe I have done something wrong, how could you see in the standard solvers such errors ?
  10. BOCH

    Non-Convergence of time history cases - Instability and ill conditioned structure

    Hi guys, I am currently facing a problem with SAP 18.0.1 while running a model that is seismically isolated using triple friction pendulums. 9 non-linear time history cases are applied in the triplet directions (XYZ in same case). Some of these cases are converging and some are not .. at the...
  11. BOCH

    ASCE 7-10 wind loads pressure equation 27.4-1

    Hi guys, Does anyone know how to develop equation 27.4-1 which gives the wind pressure (from the wind velocity) ? I think this equation will generate different case depending on GCpi .. I was struggling a bit to find a simple way to develop this equation and apply it as different case .. I would...
  12. BOCH

    Water uplift pressure where single footing system is adopted

    Hi guys, When designing a single footing shall I consider water uplift pressure ? What I have in my mind is that if the water table level have increased, the water is allowed to move up from the sides of the isolated footings, hence no pressure is applied to the footing .. however this pressure...
  13. BOCH

    Openings in structural concrete walls

    Alright, cheers KootK .. I will have a look at the document, thanks a lot.
  14. BOCH

    Load combination including the temperature

    The Eurocode is very clear about combination of temperature with other cases, the attached image is showing a eurocode developed load combination that we've done for one of your project (keep in mind that the factors used in the attached image, highlighted in yellow, are depending on the...
  15. BOCH

    Openings in structural concrete walls

    Hello guys, My issue is that I am doing a project which contains lots of MEP openings in walls, the project is structurally critical as well .. I know that in ACI code there are some restrictions and guide lines for openings in walls, however what I want to know is how much I can allow with this...
  16. BOCH

    Etabs 13 Spandrels Labeling

    Hello guys, What is the best way to assign spandrel labels in order to read correct results (bending, axial, design, ..)? The situation I am facing could be found in the attached PDF sketch: The spandrel wall continuous on 3 different stories is labeled with 2 different naming per span to...
  17. BOCH

    Etabs 13 base shear calculation check according to UBC97

    Hi guys, I would like to share with you this incidence, I was running an Etabs 13 model and checking the calculated base shear (according to UBC97), This is what I have got (image attached), The used period to calculate the base shear in X direction was not taken as per the “Modal direction...
  18. BOCH

    ACI318 sevice load combination ?

    Hello guys, I was looking in the ACI 318 code on service load combinations, but I couldn't fine any .. I have just found combinations related to the strength ultimate design .. Does anyone have an idea where can I find service load combinations according to ACI code ? Thank you ..
  19. BOCH

    Shear and Torsion check in irregular sections according Eurocode

    Yes I know S-Concrete is pretty good, but it doesn't deal with irregular sections .. like curved sections .. I have found Adsec from Oasys, but this one doesn't check shear and torsion ..
  20. BOCH

    Shear and Torsion check in irregular sections according Eurocode

    Hello guys, Does anyone knows if there is any available software that can check shear and torsion for irregular concrete reinforced sections ? I couldn't find any till now .. it would be very helpful if someone used to check shear and torsion for irregular sections .. Thank you ..

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