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  • Users: CHAKKOUR
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  1. CHAKKOUR

    shear friction method

    HI, In the shear friction method, the reinforcement Avf is to be added with the tension reinforcement ??
  2. CHAKKOUR

    dynamic analysis

    Thanks for the reply. Even if u want to design ur foundation as per the dynamic forces, u can not on Etabs because u can import only the static forces due to the earthquake. if u're in high seismic zone, do u design ur foundation to remain elastic by multiplying the forces due to the quake by...
  3. CHAKKOUR

    dynamic analysis

    Hi, When i run a dynamic analysis, should i erase the combinations that include the static earthquakes loads after scaling the base shear and leave only the combinations including Spec X and Spec Y ?? And why when i import the loads towards safe, i dont have the possibility to run the loads...
  4. CHAKKOUR

    problem with scaling the base shear

    Hi, I have an etabs model 9 stories+ 4basements. I am using the ritz vectors because it is not converging with the eigen vector. However, i have a problem in scaling the base shear. Each time i run the model, i have a different base shear from the spectrum case. Thanks for the help
  5. CHAKKOUR

    mass source

    ok thanks, and for the second option, we should always check it or there are some occasions where we should uncheck ?? thanks
  6. CHAKKOUR

    mass source

    Hi, When i define the lateral mass in Etabs, there are 2 items which needs to be checked (include lateral mass only and lumpimg mass at each floor level), should i check these 2 ?? thanks
  7. CHAKKOUR

    strips in safe 12

    hi, thanks for the answer. If i let SAFE 8 draw automatically the strips by defining the grids at selected points and i export to safe12, does it work ?? Thanks
  8. CHAKKOUR

    P-delta analysis

    Hi, Please correct me if im wrong: When i run a P-delta analysis in Etabs, if there is no lateral loads, then the P-delta analysis additional moments and axial would be negligible. Nevertheless, i do enter 1.2DL+1.6 LL (ACI combination). When the lateral loads are significant, then i take a...
  9. CHAKKOUR

    flat slab in zones 3 &4

    ok, i agree, but since u will check ur slab against earthquake (punshing stress + vertical earthquake), do i have to check it for something else (other than gravity loads of course) ?? Thanks for ur help. 2nd question : I dont know if u're familiar with etabs, when u assign stiffness modifier...
  10. CHAKKOUR

    flat slab in zones 3 &4

    In the specifications, we shall use the UBC 97. So, back to the main question, what do u think ?? since the vertical earthquake is included in the 0.5 x Ca x I, why is it forbidden to use flat slab system in high seismicity zone ? Thanks
  11. CHAKKOUR

    flat slab in zones 3 &4

    Hi guys, Why does the UBC 97 forbid the use of flat slabs in high seismicity zone ?? since it will work as a diaphragm transmitting the forces to the vertical columns, where is the problem ?? Is it because the vertical earthquake ?? Thanks a lot
  12. CHAKKOUR

    strips in safe 12

    Hi, Please could someone tell me if there is an easy and fast method to draw the strips in safe 12?? Can i draw it in autocad and export it as areas ?? Thanks a lot
  13. CHAKKOUR

    calculation of sway and non sway column in Etabs

    Thanks a lot. Another question, when do u have a transfer beam supporting a column carrying many floors, can we release the edges of the beam so it wont transmit the shear and the moment to the column supporting the transfer beam ??
  14. CHAKKOUR

    calculation of sway and non sway column in Etabs

    Thanks SaeedHR. But how can i check if a story is sway or non sway(in etabs without calculating the Q) ?? And why in the overwtites, etabs gives u the chance to change its K if he wont take into account?? Thanks
  15. CHAKKOUR

    calculation of sway and non sway column in Etabs

    Hi guys, Etabs doent calculate the Q proposed by the ACI to determine a floor if its sway or non sway. I took an example of a one single column fixed at the base, length = 8m and i run the calculation. In the summary, k = 1 which its wrong. In addition to that, i think that there is a bug in...
  16. CHAKKOUR

    beams torsion in safe

    Hi guys, When i have a solid slab ( drops + beams) with edge beams, and when i assign to the beams no torsional stiffness so the slab can handle the torsion, i have a warning in the safe run analysis : "structure unstable or ill conditioned", i dont understand why. There is a torsion...
  17. CHAKKOUR

    transfer beam releases

    Hi guys, i have 2 questions : 1-I was reading Etabs manual. Does someone know in which cases do we perform a post yielding analysis by putting non linear hinges in our model ? 2- I have a transfer beam carrying a column (lets say A1) supporting 10 floors. I released the edges of the beam so...
  18. CHAKKOUR

    torsion in the beams in SAFE

    Hi guys, When i have a solid slab ( drops + beams) with edge beams, and when i assign to the beams no torsional stiffness so the slab can handle the torsion, i have a warning in the safe run analysis : "structure unstable or ill conditioned", i dont understand why. There is a torsion...
  19. CHAKKOUR

    when do u put non linear hinges + release of a transfer beam

    Hi guys, i have 2 questions : 1-I was reading Etabs manual. Does someone know in which cases do we perform a post yielding analysis by putting non linear hinges in our model ? 2- I have a transfer beam carrying a column (lets say A1) supporting 10 floors. I released the edges of the beam so...
  20. CHAKKOUR

    Twisting moment in 2ways slab

    hi, When do we have a flat slab with edge beams or drop panels, how can we take into account the torsion ? We cant use the wood amer analysis because it doesnt apply at the flat slab with beams or drops. How can i integer the Mxy in the strips ?? Thanks a lot.

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