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  1. Ahmed A. Alamin

    R.C Column with Two layers of Reinforcement

    Hi, i came across R.C column which is reinfirced in two layers. Is this allowed? How the inner layer contriibutes? and if it's allowed could someone recommend some references or resources that discuss this. #See attached...
  2. Ahmed A. Alamin

    Underground Column Design

    Hello, a 3m short column " column that extends from the foundation up to the suspended floor level" was designed as such, the client whiches to elevate the ground floor up higher "1.2 m " due various reasons. The problem with that is that one particular column fails. When designing theses...
  3. Ahmed A. Alamin

    Limitations of the equivalent lateral force procedure (ASCE7 &EC8)

    Hi, i'm kindda new to ASCE7, i was wondering what are the limitations of ELF procedure, i.e when not to use it. In EC8, it is stated that only in case of vertical irregularity you shouldn't use the simplified lateral force method. Honestly, i'm not fully convinced with this, so i started looking...
  4. Ahmed A. Alamin

    Wind loading in Buildings

    Hello everyone, i have a question regarding wind loads. Is linear static method of analysis always used in wind analysis? If not, what are the limitations?.
  5. Ahmed A. Alamin

    Equivalent lateral force procedure

    This may sound silly, but how could i check that resonance is not a problem using Equivalent lateral force procedure, or the lateral force method in EC8
  6. Ahmed A. Alamin

    Solid Slab Resting on Masonary Walls

    Hellow everyone, i'm trying to design a solid slab that rests on masonary walls. My question is about the design of the supporting beams. Knowing that these beams carry the slab and rests directly on the wall, how i could analyze and design such beams? Is it similar to beam on elastic...
  7. Ahmed A. Alamin

    Load bearing Masonary wall

    Hellow engineers, i'm trying to model a two-story load bearing building using CSI ETABS, Solid slabs rests directly on masonary walls. To my understanding that beams are are rigidly connected to the slab. The masonary wall however should not be connected rigidly to the beam, as they are not able...
  8. Ahmed A. Alamin

    Load Bearing Wall Building

    Hellow engineers, i'm trying to model a two-story load bearing building using CSI ETABS, Solid slabs rests directly on masonary walls. To my understanding that beams are are rigidly connected to the slab. The masonary wall however should not be connected rigidly to the beam, as they are not able...
  9. Ahmed A. Alamin

    column effective length ETABS

    Hi, i'm trying to model a column that runs from the ground floor up to the 2nd floor without connecting to the 1st floor slab, that is length as one column should be double that of the other column and therfore its effective length is consequently larger than other coulmn. But, it seems to me...
  10. Ahmed A. Alamin

    Column Design, CSI ETABS

    Hello everyone, i'm trying to design R.C columns in a multi-story building, i've noticed that the demand/capacity ratio doesn't change when you change the column direction (rotate the column 90 degree so that the larger moment to be about the major axis. Could anyone explain why this happens.
  11. Ahmed A. Alamin

    Shear lag in R.C Beams

    Hello engineers i came across the concept of effective width in R.C beams, i found that the concept behind it is to account for shear lag and concequently the unevem stress distribution though i could not fully grasp how exactly this happens. Could anyone explain this more to me?
  12. Ahmed A. Alamin

    Piles and Pile Caps

    Hello fellow engineers, i have a question regarding the structural design of piles and pile cap. I know that piles are structurally designed as columns but do they follow the same classification " Slender/Short" in other words what is the effect of the surrounding soil? and how it could be...
  13. Ahmed A. Alamin

    Solid Slab 10m span

    Hellow engineers, i'm designing a leture halls building. The spans in one direction are 10m and 6m respectively and in the other direction are 5m. As my first option" attempt" i tried solid slab with a thickness of 20cm and beams are 70cm deep by 35cm width. Honestly, i didn't expect this choice...
  14. Ahmed A. Alamin

    Design of a multi-story building

    Hi, i'm designing a concrete multi-story building. I've noticed that some of the columns at top stories fail while columns at lower stories at the same elevation don't though they have the same cross-section. Also, i noticed that moments under grivity loads increase in columns as you go up...
  15. Ahmed A. Alamin

    Structural Design of Pile Caps and Piles

    Should i design R.C piles structurally as columns? If so; piles are normally too long " will the pile be classified as slender column?" What is the effect of the surrounding soil ?..Also, pile caps are normally analayzed and designed using strut and tie models, is there any software capable of...
  16. Ahmed A. Alamin

    Steel Portal Frame -Etabs

    I'm Anyone knows how to model portal feame sheathing in Etabs for the purpose of only transfering gravity loading yo purlins, and wind loads "without contributing to frame stiffness. also, how to model partial fixity at column-base connection ; how to add tapered sections or haunches; can i...
  17. Ahmed A. Alamin

    Bearing strength of concrete VS Compressive strength of concrete

    I'm having trouble differentiating between bearing strength of concrete and compressive strength of concrete, why bearing strength is used istead in some design situatio, for example sizing base plates resting on concrete.. Eurocode-2 gives a values of "2/3 fcd" to bearing strength of...
  18. Ahmed A. Alamin

    Steel Portal Frame

    Many desogner in analysis consider portal frames to be pin-connected to the foundation, how this ensured in practise.
  19. Ahmed A. Alamin

    References in Design of Foundation for Vibration Control

    Hi, i need suggestion of references deals with structural design of foundation for vibration, and structural design of piles and pile caps.. " Not critical; preferably follow European Standards; if not that's fine"
  20. Ahmed A. Alamin

    Plastic VS Non-linear Analysis

    I know that this is basic to some of you "excuse my ignorance".... is plastic analysis some form of non-linear analysis?

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