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  1. Yousef ZAA

    Alternative Diaphragm Design: Shear VS Flexure Controlled Diaphragms!!

    When designing a diaphragm using the alternative diaphragm method, there are two categories, shear controlled and flexure controlled, I am getting confused on how can I qualify my diaphragm according to those two categories! The definition of the ASCE7-16 is very general! THIS IS FROM THE...
  2. Yousef ZAA

    Seismic Loads on box culverts!

    Is there any good reference for a simplified method of seismic design of culverts??
  3. Yousef ZAA

    Horizontal Shear Capacity for Composite Double Tees!!

    Hi All, I am designing a field topped composite double tee and I have some doubts on how all engineering programs calculates the horizontal shear forces and stresses: For a composite member all commercial programs checks vertical shear for an expected shear crack through the thinnest part of the...
  4. Yousef ZAA

    PAD VIBRATOR ISOLATORS

    Hi! I am a structural engineer, and I am designing a project in which has a generator at the roof, the EOR has sent me the generator specs, showing a statement that the generator has built in vibration pads, with that information, I can assume that there is no vibration and consequently no...
  5. Yousef ZAA

    Plan checker!!

    Dears, for those who asked about the scope of what is called review engineer or plan checker: performing and managing plan reviews for projects. Projects ranging from small residential projects to high-rise hotels and office buildings, institutional occupancies such as hospitals and jails...
  6. Yousef ZAA

    Plan checker!!

    SWComposites--Yes, I have a career path, but at my current job, I am working for the US, overseas at my current job (Not physically in the US) The review engineering firm is offering H1B visa that could get me physically in the US, rather than working overseas.
  7. Yousef ZAA

    Plan checker!!

    SWC- I work in precast design and I have been offered to be Review Structural Engineer at another firm owned by firmer building official, simply the review engineer checks the structural, mechanical, Architectural aspects of projects to be code compliant, my concern is it will be less practicing...
  8. Yousef ZAA

    Plan checker!!

    Hello, I’m a Structural Engineer I work at a design precast specialty engineering firm and I have been offered a job as plan checker?! What is the future for plan checkers!?
  9. Yousef ZAA

    Using Two Different lateral system in each direction with different R and Cd

    Hello, Does it makes sense to choose a lateral resisting system category in each direction? With different R and Cd? If I have non-load bearing precast shear walls in the Y-axis and load bearing precast shear walls in the X-axis, Knowing that non-load bearing precast shear walls have higher...
  10. Yousef ZAA

    Unrealistic Shear Diagram in ETABS

    Thank you all for your helpful input.
  11. Yousef ZAA

    Unrealistic Shear Diagram in ETABS

    Good day, I have a problem justifying the shear diagram in one of the shear walls; The structure consists of shear walls and since the slab qualifies to a rigid diaphragm, a rigid constraints has been assigned to all shear walls joints. Of course the expected shear diagram of each shear wall is...
  12. Yousef ZAA

    Unrealstic shear diagram in ETABS!!!

    Good day, I have a problem justifying the shear diagram in one my shear walls; I have modeled my structure that consists of shear walls and since my slab qualifies to a rigid diaphragm, I have assigned rigid constraints to my shear walls joints. Of course the expected shear diagram of each shear...
  13. Yousef ZAA

    ASCE7-16, Application of overstrength factor in Buildings in SDC B

    Good day Engineers, For Buildings with SDC B that have vertical irregularity of type 4 (Discontinuous Shear Walls-Having Shear walls supported on beams and columns), Table 12-3-2 in ASCE7-16 refers to section 12.3.3.3 which says that elements supporting discontinuous walls should be designed...
  14. Yousef ZAA

    Application of overstrength factor in Buildings in SDC B

    Good day Engineers, For Buildings with SDC B that have vertical irregularity of type 4 (Discontinuous Shear Walls-Having Shear walls supported on beams and columns), Table 12-3-2 in ASCE7-16 refers to section 12.3.3.3 which says that elements supporting discontinuous walls should be designed...
  15. Yousef ZAA

    Non-Linear Boundary Condition

    Why do we define the compression only or tension only springs as non-linear springs?
  16. Yousef ZAA

    Difference between web-shear and flexure shear

    Thank you very much guys, yes I meant it in prestressed concrete.
  17. Yousef ZAA

    Difference between web-shear and flexure shear

    Hello, Can some one give me a hint on the differnce between web-shear and flexure shear strength?
  18. Yousef ZAA

    Distribution of base shear forces in ETABS

    Can you elaborate please?
  19. Yousef ZAA

    Distribution of base shear forces in ETABS

    Hello, I have a question that may sound trivial! If I modelled a wall in ETABS as a shell thin and applied on shear forces at different levels, and I defined the restraints at the base on the two edges as pin-pin, shouldn't the two reactions at the base be equal? I see a difference in...
  20. Yousef ZAA

    Non-Triangular (Rectangular) Steel Bracket

    Hello, I have a precast connection connecting to different walls, I have a rectangular steel plate works as a bracket, I'm trying to design it, but I can't decide whether, I have to apply the triangular bracket design procedure or not, to my surprise I contacted AISC and they told me that most...

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